{"id":6682,"date":"2026-10-09T06:58:00","date_gmt":"2026-10-09T06:58:00","guid":{"rendered":"https:\/\/bioprofile.com\/?p=6682"},"modified":"2026-10-09T20:03:03","modified_gmt":"2026-10-09T20:03:03","slug":"always-feeling-cold-and-tired-causes","status":"publish","type":"post","link":"https:\/\/bioprofile.com\/en\/always-feeling-cold-and-tired-causes\/","title":{"rendered":"Always feeling cold and tired: the causes a blood test sees, and what an energy scan measures"},"content":{"rendered":"\n<article class=\"wp-block-group bp-blog is-layout-flow wp-block-group-is-layout-flow\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link rel=\"stylesheet\" href=\"https:\/\/fonts.googleapis.com\/css2?family=Poppins:wght@300;400;500;600;700&#038;display=swap\">\n<style id=\"bp-blog-design\">\n.bp-blog {\n  --bp-ink: #212527; --bp-teal: #005859; --bp-teal-deep: #006B62; --bp-emerald: #228A62;\n  --bp-green: #7CA74D; --bp-lime: #B7CB33; --bp-lime-soft: #B7CB3329; --bp-green-aa: #4F6B28;\n  --bp-beige: #EDEAE5; --bp-sand: #DBD4CB; --bp-pale-teal: #D9E6E6; --bp-white: #FFFFFF;\n  --bp-foot: #6b6b6b;\n  --bp-font: 'Poppins','Segoe UI',Arial,sans-serif;\n  --bp-fs-h1: 40px; --bp-fs-h2: 29px; --bp-fs-h3: 21px; --bp-fs-body: 17px;\n  --bp-fs-lead: 19px; --bp-fs-small: 14px; --bp-fs-foot: 13px; --bp-fs-btn: 17px;\n  --bp-lh-body: 1.75;\n  --bp-s-2: 8px; --bp-s-3: 12px; --bp-s-4: 16px; --bp-s-5: 24px; --bp-s-6: 32px;\n  --bp-s-7: 44px; --bp-s-8: 72px;\n  --bp-measure: 875px; --bp-prose: 875px; --bp-side: 40px; --bp-portrait: 132px;\n  --bp-radius-card: 20px; --bp-radius-btn: 10px; --bp-radius-chip: 999px;\n  --bp-shadow: 0 10px 30px rgba(0,88,89,0.10); --bp-shadow-soft: 0 2px 10px rgba(0,88,89,0.06);\n  font-family: var(--bp-font); font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  color: var(--bp-ink); background: var(--bp-white); -webkit-font-smoothing: antialiased;\n}\n.bp-blog, .bp-blog * { box-sizing: border-box; }\n.bp-blog p, .bp-blog li, .bp-blog h1, .bp-blog h2, .bp-blog h3, .bp-blog a, .bp-blog td,\n.bp-blog th, .bp-blog cite { overflow-wrap: break-word; min-width: 0; }\n.bp-blog h1, .bp-blog h2, .bp-blog h3 { text-wrap: balance; }\n.bp-blog p, .bp-blog li { text-wrap: pretty; }\n\/* WordPress core's flow layout puts 24px above every child after the first; inside\n   a grid or a flex row that is a misalignment (measured on the scan pages 2026-08-21) *\/\n.bp-blog .bp-blog-author > *, .bp-blog .bp-blog-related > *, .bp-blog .bp-blog-verify > * { margin-block: 0; }\n\n\/* --- sections: one column, the article measure, the section rhythm ------------ *\/\n.bp-blog-sec { position: relative; background: var(--bp-white); margin-block: 0;\n  padding-block: var(--bp-s-7);\n  padding-inline: max(var(--bp-side), calc((100% - var(--bp-measure)) \/ 2)); }\n.bp-blog-sec > *:last-child { margin-block-end: 0; }\n.bp-blog-sec > p, .bp-blog-sec > ul, .bp-blog-sec > ol, .bp-blog-sec > .wp-block-quote,\n.bp-blog-sec > .bp-blog-faq-item, .bp-blog-sec > .bp-blog-takeaways, .bp-blog-sec > .bp-blog-toc,\n.bp-blog-sec > .bp-blog-refs, .bp-blog-sec > .bp-blog-srclead { max-width: var(--bp-prose); }\n.bp-blog-sec--head { padding-block: var(--bp-s-7) 0; }\n.bp-blog-sec--body { padding-block: var(--bp-s-6) var(--bp-s-7); }\n.bp-blog-sec--beige { background: var(--bp-beige); }\n.bp-blog-sec--wash { background: linear-gradient(180deg, #B7CB331A 0%, #B7CB330D 100%), #FFFFFF; }\n.bp-blog-sec--tight { padding-block: var(--bp-s-6); }\n\/* A COLOURED SECTION IS A PANEL, so it carries the panel radius. Measured on the\n   live site 2026-08-28 rather than chosen: bioprofile.com's own coloured blocks\n   come in two families, full-bleed strips (w=1440 edge to edge, radius 0, 40px\n   side padding) and inset panels (the lime block w=677 and the sand block w=576,\n   both radius 16px). Ours cannot be the first: the theme's content wrapper is\n   1140px, so a coloured section here stops 150px short of the screen on both\n   sides and reads as an inset panel with square corners, which is the thing the\n   operator saw. So it takes the panel treatment. The radius is this template's\n   own --bp-radius-card (20px, shared with the scan pages) rather than the site's\n   16px, so the page carries ONE panel radius instead of a third value.\n   The small vertical margin is what lets the corners read where two coloured\n   panels stack (the CTA, the FAQ wash and the sources beige run consecutively). *\/\n.bp-blog .bp-blog-sec--beige, .bp-blog .bp-blog-sec--wash, .bp-blog .bp-blog-cta {\n  border-radius: var(--bp-radius-card); margin-block: var(--bp-s-3); }\n.bp-blog-sec--foot { padding-block: var(--bp-s-5) var(--bp-s-7); border-top: 1px solid var(--bp-sand); }\n.bp-blog .bp-blog-rule { height: 6px; border: 0; margin-block: 0; max-width: none;\n  background: linear-gradient(90deg, #005859 0%, #006B62 38%, #228A62 66%, #B7CB33 100%); }\n\n\/* --- core blocks by element ------------------------------------------------- *\/\n.bp-blog p { font-size: var(--bp-fs-body); line-height: var(--bp-lh-body); margin-block: 0 var(--bp-s-5); }\n.bp-blog h1 { font-size: var(--bp-fs-h1); font-weight: 700; line-height: 1.22; letter-spacing: -0.01em;\n  margin-block: 0 var(--bp-s-4); color: var(--bp-ink); max-width: var(--bp-measure); }\n.bp-blog h2 { font-size: var(--bp-fs-h2); font-weight: 700; line-height: 1.3; letter-spacing: -0.01em;\n  color: var(--bp-ink); margin-block: var(--bp-s-4) var(--bp-s-4); padding-block-start: var(--bp-s-4);\n  position: relative; max-width: var(--bp-prose); }\n.bp-blog h2::before { content: \"\"; position: absolute; top: 0; left: 0; width: 56px; height: 4px;\n  border-radius: 2px; background: var(--bp-lime); }\n.bp-blog h3 { font-size: var(--bp-fs-h3); font-weight: 700; line-height: 1.35; color: var(--bp-teal);\n  margin-block: var(--bp-s-2) var(--bp-s-3); max-width: var(--bp-prose); }\n.bp-blog ul, .bp-blog ol { font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  margin-block: 0 var(--bp-s-5); padding-left: var(--bp-s-5); }\n.bp-blog li { margin-block-end: var(--bp-s-2); }\n.bp-blog a { color: var(--bp-teal); text-decoration: underline; text-underline-offset: 2px; }\n.bp-blog a:hover { color: var(--bp-green); }\n.bp-blog strong { font-weight: 600; }\n.bp-blog .wp-block-quote { border-left: 4px solid var(--bp-lime); margin: 0 0 var(--bp-s-5);\n  padding: var(--bp-s-2) 0 var(--bp-s-2) var(--bp-s-5); font-style: normal; }\n.bp-blog .wp-block-quote p { margin-block: 0 var(--bp-s-2); }\n.bp-blog .wp-block-quote cite { font-size: var(--bp-fs-small); color: var(--bp-foot); font-style: normal; }\n.bp-blog .wp-block-table { margin: 0 0 var(--bp-s-5); overflow-x: auto; }\n.bp-blog .wp-block-table table { border-collapse: collapse; width: 100%; font-size: var(--bp-fs-small); }\n.bp-blog .wp-block-table th, .bp-blog .wp-block-table td { border: 1px solid var(--bp-sand);\n  padding: var(--bp-s-2) var(--bp-s-3); text-align: left; vertical-align: top; }\n.bp-blog .wp-block-table th { background: var(--bp-beige); font-weight: 600; }\n.bp-blog .wp-block-image { margin: 0 0 var(--bp-s-5); }\n.bp-blog .wp-block-image img { display: block; width: 100%; height: auto;\n  border-radius: var(--bp-radius-card); box-shadow: var(--bp-shadow); }\n.bp-blog .wp-block-image figcaption { font-size: var(--bp-fs-foot); line-height: 1.6; color: var(--bp-foot);\n  text-align: left; margin-block: var(--bp-s-2) 0; }\n.bp-blog .wp-block-separator { border: 0; border-top: 1px solid var(--bp-sand); margin-block: var(--bp-s-6); }\n\n\/* --- buttons: two classes so core's own rule cannot win ------------------------ *\/\n.bp-blog .wp-block-buttons { display: flex; justify-content: flex-start; margin-block: 0 var(--bp-s-3); }\n.bp-blog .wp-block-button__link { display: inline-flex; align-items: center; justify-content: center;\n  min-height: 52px; background: var(--bp-teal); color: var(--bp-white); font-size: var(--bp-fs-btn);\n  font-weight: 700; line-height: 1.2; border-radius: var(--bp-radius-btn); padding: 15px 40px;\n  text-decoration: none; transition: background 250ms ease; box-shadow: var(--bp-shadow); }\n.bp-blog .wp-block-button__link:hover { background: var(--bp-green); color: var(--bp-white); }\n\n\/* --- the head: category, title, the meta line, the picture ------------------- *\/\n.bp-blog .bp-blog-eyebrow { font-size: 15px; font-weight: 600; letter-spacing: 0.08em;\n  text-transform: uppercase; margin-block: 0 var(--bp-s-3); }\n.bp-blog .bp-blog-eyebrow a { color: var(--bp-green-aa); text-decoration: none; }\n.bp-blog .bp-blog-eyebrow a:hover { text-decoration: underline; }\n.bp-blog .bp-blog-meta { font-size: var(--bp-fs-small); line-height: 1.6; color: var(--bp-foot);\n  margin-block: 0 var(--bp-s-5); max-width: var(--bp-measure); }\n.bp-blog .bp-blog-meta a { color: var(--bp-foot); }\n\/* A text link is a thumb target of at least 44px (T332b). 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}\n}\n\n\/* --- verified by: exists only for a real, confirmed verifier ------------------- *\/\n.bp-blog .bp-blog-verify { background: var(--bp-white); border: 1px solid var(--bp-sand);\n  border-radius: var(--bp-radius-card); box-shadow: inset 5px 0 0 var(--bp-lime), var(--bp-shadow-soft);\n  padding: var(--bp-s-4) var(--bp-s-5) var(--bp-s-4) var(--bp-s-6); margin-block: 0 var(--bp-s-4); }\n.bp-blog .bp-blog-verify > * { margin-block: 0 var(--bp-s-2); max-width: none; }\n.bp-blog .bp-blog-verify-name { font-size: 18px; font-weight: 700; }\n.bp-blog .bp-blog-verify-cred { font-size: var(--bp-fs-small); color: var(--bp-foot); }\n\/* T332, Jesse 2026-09-17: a SMALL box at the top, under the introduction *\/\n.bp-blog .bp-blog-verify--top { display: grid; grid-template-columns: 56px 1fr; column-gap: 14px;\n  align-items: center; padding: 12px 16px; margin-block: var(--bp-s-3); max-width: var(--bp-prose); }\n.bp-blog .bp-blog-verify--top > * { margin: 0; }\n.bp-blog .bp-blog-verify--top .wp-block-image { grid-row: span 3; 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That matters, because sometimes there is something behind it that a doctor can find, and more often something everyday. Everyone is sitting in a T-shirt and you are wearing a cardigan. Your hands and feet are cold, you are tired before the day has begun, and you wonder whether the two belong together. Sometimes they do: being cold all the time and being tired is the combination in which an underactive thyroid and an iron deficiency announce themselves, and a blood test sees both. More often something more everyday is going on. <a href=\"https:\/\/bioprofile.com\/en\/scan-fatigue-test\/\">BioProfile&#8217;s energy scan<\/a> measures how much these complaints affect you, and gives you an indication of where you stand today in this area, as the first of the 11 health areas that the full scan assesses. This is not a diagnosis. It is insight, to see where you stand today. And to help you make better choices in your food and your lifestyle. What this scan does not do: measure your thyroid or your iron, or make a diagnosis. Only a doctor can do the latter, and only blood the former.<\/p>\n\n\n\n<div class=\"wp-block-group bp-blog-verify bp-blog-verify--top is-layout-flow wp-block-group-is-layout-flow\">\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"290\" height=\"362\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/rt-portret-carlos-mendoza-montano.webp\" alt=\"Portrait of Carlos Mendoza Montano\" class=\"wp-image-5959\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/rt-portret-carlos-mendoza-montano.webp 290w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/rt-portret-carlos-mendoza-montano-240x300.webp 240w\" sizes=\"(max-width: 290px) 100vw, 290px\" \/><\/figure>\n\n\n\n<p class=\"bp-blog-verify-name wp-block-paragraph\">Verified by <a href=\"https:\/\/www.linkedin.com\/in\/carlos-mendoza-montano-37615639\/\">Carlos Mendoza Montano<\/a><\/p>\n\n\n\n<p class=\"bp-blog-verify-cred wp-block-paragraph\">Doctorate in nutritional biochemistry from the University of Arizona<\/p>\n\n\n\n<p class=\"bp-blog-verify-date wp-block-paragraph\">Checked on 9 October 2026<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-takeaways is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">In short<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Tired, cold and gaining weight is the list of an underactive thyroid, and a blood test sees that.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/li>\n\n\n<li>A single symptom says little: in 25,862 people the symptoms were more common with an underactive thyroid, but each symptom on its own pointed to it only weakly. Several symptoms together are the reason to take blood.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup><\/li>\n\n\n<li>An energy scan measures how much fatigue you are carrying and gives you a baseline. It does not measure your thyroid and it does not measure iron, and it does not make a diagnosis.<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-toc is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-toclabel wp-block-paragraph\">Contents<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li><a href=\"#een-trage-schildklier\">An underactive thyroid<\/a><\/li>\n\n\n<li><a href=\"#te-weinig-ijzer\">Too little iron<\/a><\/li>\n\n\n<li><a href=\"#als-bloed-niets-vindt\">When blood finds nothing<\/a><\/li>\n\n\n<li><a href=\"#wat-een-energiescan-meet\">What an energy scan measures<\/a><\/li>\n\n\n<li><a href=\"#wat-een-energiescan-niet-meet\">What an energy scan does not measure<\/a><\/li>\n\n\n<li><a href=\"#wat-je-met-je-score-doet\">What you do with your score<\/a><\/li>\n\n\n<li><a href=\"#veelgestelde-vragen\">Frequently asked questions<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"een-trage-schildklier\">An underactive thyroid<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You are tired, you feel cold, you gain weight: that is the list Thuisarts uses to describe an underactive thyroid, and the GP recognises it by a TSH that is too high in your blood.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> The full list is longer. The most common complaints in adults are fatigue, listlessness, poor tolerance of cold, weight gain, constipation, a changed voice and dry skin, and the severity runs from no complaints at all to life threatening. The condition itself is defined by the blood values and not by the complaints.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How often it occurs was measured in 25,862 visitors to a health fair in Colorado: 9.5 per cent had a raised TSH and 2.2 per cent a lowered one. The symptoms were more common in the people with an underactive thyroid, but each symptom on its own pointed to it only weakly. The researchers&#8217; conclusion: anyone reporting several thyroid symptoms at once deserves a blood test.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> So feeling cold on its own is not a reason; feeling cold together with tiredness, weight and a sluggish bowel is.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"te-weinig-ijzer\">Too little iron<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The second cause blood sees is a shortage of iron. Worldwide it is one of the largest sources of disease burden, it affects children and women before the menopause most of all, and the symptoms can be there before the blood count shows anaemia.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup> Anaemia itself feels like being tired and weak, out of breath on exertion, dizzy, with a pounding heart and less colour in your face. It usually comes from too little iron, in women often from heavy periods, and over the age of 50 from blood loss in the bowel; the GP measures the haemoglobin, and anaemia means below 8.5 mmol\/l in men and below 7.5 mmol\/l in women.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a>,<a href=\"#bronnen\">6<\/a><\/sup> A shortage always has a cause, and the doctor looks for that as well.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"als-bloed-niets-vindt\">When blood finds nothing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">That is the usual outcome. If you have no other symptoms alongside the tiredness, a blood test almost never turns up a cause, Thuisarts says,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup> and in a Dutch cohort of 571 people who came to the GP with fatigue, a clear physical illness was found in 8 per cent within a year.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">8<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That leaves two everyday explanations. The first is a sleep debt you do not feel as a debt: people who slept six hours for fourteen nights performed, by the end, as though they had gone up to two nights without sleep, and felt barely sleepier.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">9<\/a><\/sup> The second is that your body makes less heat than the norm assumes. Researchers in Maastricht measured a lower resting metabolism in young women than the standard on which office temperatures are based, which explains why the same room is pleasant for one person and cold for another.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">10<\/a><\/sup> So cold and tired can also be two ordinary things at once.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-een-energiescan-meet\">What an energy scan measures<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The energy scan asks five questions about the past two weeks: your energy through the day, energy dips, how much you lean on caffeine, becoming physically tired, and being too spent to do things. Each question is given points, the points are added up and converted into an energy score from 0 to 100, with the reading band it falls into. Higher is better. The questions are modelled on a validated fatigue scale written in Dutch; they are worded in house, not a copy, so the score is not a validated clinical score. What you get is a picture of how much fatigue you are carrying, and a baseline.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-een-energiescan-niet-meet\">What an energy scan does not measure<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A questionnaire cannot attribute fatigue to anything. An underactive thyroid, a shortage of iron, a poor sleep pattern and a low mood all read the same in it. So an energy scan does not make a diagnosis. Blood values are the layer that takes this from a picture of the burden to an explained picture, and those you ask a doctor for. Tiredness that lasts longer than a month, or that goes together with sweating at night, less appetite, shortness of breath or a lot of thirst, is a reason to see your GP.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-je-met-je-score-doet\">What you do with your score<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A score today is your baseline. Take the set of cold, tired, heavier and a sluggish bowel to your GP and ask for blood, because that set is the reason to take it.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> If the blood finds nothing, repeat the scan in two weeks, over the same questions, and work on your nights in the meantime: the debt you do not feel is the debt that costs you energy.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">9<\/a><\/sup> What a sleep test measures about that is in <a href=\"https:\/\/bioprofile.com\/en\/why-you-wake-up-tired\/\">why you wake up tired<\/a>.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-cta is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">Measure where you start<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Five questions about the past two weeks, about three minutes, and your energy score is in your dashboard. What the energy scan measures and what it is based on is on the scan page.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/bioprofile.com\/en\/scan-fatigue-test\/\">Start the energy scan<\/a><\/div>\n\n<\/div>\n\n\n\n<p class=\"bp-blog-ctamicro wp-block-paragraph\">Free, about 3 minutes. An analysis of your answers, never a diagnosis. <a href=\"https:\/\/bioprofile.com\/en\/free-health-check-tests\/\">All health scans<\/a><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"veelgestelde-vragen\">Frequently asked questions<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Why am I cold all the time and tired?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A blood test sees two causes: an underactive thyroid\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> and an iron deficiency.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup> If the blood finds nothing, then it is more often a lack of sleep that you do not feel as a lack,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">9<\/a><\/sup> or simply a lower heat production than the norm.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">10<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Which blood test do you have done when you are cold all the time and tired?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Your GP decides that, and will take blood if there are other symptoms alongside the tiredness.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup> An underactive thyroid is recognised by a TSH that is too high,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> anaemia by a haemoglobin that is too low: below 8.5 mmol\/l in men and below 7.5 mmol\/l in women.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a>,<a href=\"#bronnen\">6<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Is being cold all the time a symptom of an underactive thyroid?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It is one of them, alongside tiredness, listlessness, putting on weight, constipation, a changed voice and dry skin.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> On its own it points to it only weakly; the combination is what counts.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Can the energy scan see a thyroid problem?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The scan measures how much tiredness you carry with you; an underactive thyroid, an iron deficiency and a poor sleep pattern all read the same in it. Only blood sees the difference, and the scan does not make a diagnosis.<\/p>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--beige bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bronnen\">Sources<\/h2>\n\n\n\n<p class=\"bp-blog-srclead wp-block-paragraph\">Every source below was checked on the day this article was published. The numbering follows the text.<\/p>\n\n\n\n<ol class=\"wp-block-list bp-blog-refs\">\n\n<li>Thuisarts.nl (Nederlands Huisartsen Genootschap). Trage schildklier. <a href=\"https:\/\/www.thuisarts.nl\/trage-schildklier\">thuisarts.nl<\/a><\/li>\n\n\n<li>Canaris GJ, Manowitz NR, Mayor G, Ridgway EC. The Colorado thyroid disease prevalence study. Archives of Internal Medicine, 2000. <a href=\"https:\/\/doi.org\/10.1001\/archinte.160.4.526\">doi.org\/10.1001\/archinte.160.4.526<\/a><\/li>\n\n\n<li>Chaker L, Bianco AC, Jonklaas J, Peeters RP. Hypothyroidism. The Lancet, 2017. <a href=\"https:\/\/doi.org\/10.1016\/S0140-6736(17)30703-1\">doi.org\/10.1016\/S0140-6736(17)30703-1<\/a><\/li>\n\n\n<li>Pasricha SR, Tye-Din J, Muckenthaler MU, Swinkels DW. Iron deficiency. The Lancet, 2021. <a href=\"https:\/\/doi.org\/10.1016\/S0140-6736(20)32594-0\">doi.org\/10.1016\/S0140-6736(20)32594-0<\/a><\/li>\n\n\n<li>Thuisarts.nl (Nederlands Huisartsen Genootschap). I have anaemia. <a href=\"https:\/\/www.thuisarts.nl\/bloedarmoede\/ik-heb-bloedarmoede\">thuisarts.nl<\/a><\/li>\n\n\n<li>NHG Anaemia Working Group. NHG Guideline Anaemia (first revision). Huisarts &#038; Wetenschap, 2014. <a href=\"https:\/\/www.henw.org\/system\/files\/download\/hw5710-528.pdf\">henw.org<\/a><\/li>\n\n\n<li>Thuisarts.nl (Nederlands Huisartsen Genootschap). I am tired. What could it be? <a href=\"https:\/\/www.thuisarts.nl\/moeheid\/ik-ben-moe-wat-kan-zijn\">thuisarts.nl<\/a><\/li>\n\n\n<li>Nijrolder I, van der Windt D, de Vries H, van der Horst H. Diagnoses during follow-up of patients presenting with fatigue in primary care. Canadian Medical Association Journal, 2009. <a href=\"https:\/\/doi.org\/10.1503\/cmaj.090647\">doi.org\/10.1503\/cmaj.090647<\/a><\/li>\n\n\n<li>Van Dongen HPA, Maislin G, Mullington JM, Dinges DF. The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation. Sleep, 2003. <a href=\"https:\/\/doi.org\/10.1093\/sleep\/26.2.117\">doi.org\/10.1093\/sleep\/26.2.117<\/a><\/li>\n\n\n<li>Kingma B, van Marken Lichtenbelt W. Energy consumption in buildings and female thermal demand. Nature Climate Change, 2015. <a href=\"https:\/\/doi.org\/10.1038\/nclimate2741\">doi.org\/10.1038\/nclimate2741<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">Written by<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-author is-layout-flow wp-block-group-is-layout-flow\">\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"320\" height=\"320\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg\" alt=\"Jesse van der Velde\" class=\"wp-image-4815\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg 320w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320-300x300.jpg 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320-150x150.jpg 150w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group bp-blog-authorid is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorrole wp-block-paragraph\">Founder of BioProfile<\/p>\n\n\n\n<p class=\"bp-blog-authorname wp-block-paragraph\">Jesse van der Velde<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-authorbody is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorbio wp-block-paragraph\">Since 2006 they have guided people towards a new body and optimal health, and have written or co-written fifteen books on nutrition and health. Forever Young (2012) and Superfood Recipes (2013) both reached number 1 in the Netherlands.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-authormeta is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorbio wp-block-paragraph\"><a href=\"https:\/\/nl.linkedin.com\/in\/jessevdv\">LinkedIn<\/a><\/p>\n\n\n\n<p class=\"bp-blog-dates wp-block-paragraph\">Published on 9 October 2026 \u00b7 Last updated on 9 October 2026<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--foot is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-legal wp-block-paragraph\">BioProfile analyses your health status to guide you and your coach. It does not make a diagnosis, only a doctor can do that. Built on validated health questionnaires; the combined BioProfile score is not itself a validated clinical instrument yet. Your answers stay private (GDPR).<\/p>\n\n<\/div>\n\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Always feeling cold and tired: an underactive thyroid, too little iron, too little sleep or less body heat. What a blood test sees and what a scan measures.<\/p>\n","protected":false},"author":18,"featured_media":6180,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"2","_yoast_wpseo_opengraph-image":"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-blog-altijd-koud-hebben-en-moe-zijn-de-oorzaken-049596f6.webp","_yoast_wpseo_opengraph-image-id":"","_yoast_wpseo_twitter-image":"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-blog-altijd-koud-hebben-en-moe-zijn-de-oorzaken-049596f6.webp","_yoast_wpseo_twitter-image-id":"","inline_featured_image":false,"footnotes":""},"categories":[75],"tags":[],"class_list":["post-6682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energy-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Always feeling cold and tired: the causes | BioProfile<\/title>\n<meta name=\"description\" content=\"Always feeling cold and tired: an underactive thyroid, too little iron, too little sleep or less body heat. 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