{"id":8800008,"date":"2026-09-09T13:26:29","date_gmt":"2026-09-09T13:26:29","guid":{"rendered":"https:\/\/www.costamedicalservices.com\/spain\/medical-library\/hair-loss-weight-loss-glp-1\/"},"modified":"2026-09-09T13:26:29","modified_gmt":"2026-09-09T13:26:29","slug":"hair-loss-weight-loss-glp-1","status":"publish","type":"page","link":"https:\/\/www.costamedicalservices.com\/sv\/spain\/medical-library\/hair-loss-weight-loss-glp-1\/","title":{"rendered":"Hair loss after rapid weight loss or during GLP-1 treatment"},"content":{"rendered":"<style>.entry-title{display:none!important}.cmsarticle{--ink:#103d56;--muted:#647d8b;--blue:#2d78da;--cyan:#1baec5;--green:#16856f;--line:#d9e7ed;--soft:#f3f8fa;--warn:#fff7e8;--rose:#fff3f3;--shadow:0 18px 44px rgba(16,61,86,.11)}\n.cmsarticle,.cmsarticle *{box-sizing:border-box}.cmsarticle html{scroll-behavior:smooth}.cmsarticle{margin:0;background:#fff;color:var(--ink);font-family:Inter,Arial,sans-serif;line-height:1.68}.cmsarticle 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span{display:block;font-size:11px;color:var(--muted);font-weight:600;margin-top:3px}.cmsarticle .reviewer{display:grid;grid-template-columns:70px 1fr;gap:17px;padding:22px;border:1px solid var(--line);border-radius:18px;margin:30px 0 22px;background:#fff}.cmsarticle .avatar{width:70px;height:70px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,#daf4f7,#e8eefb);font-size:22px;font-weight:900}.cmsarticle .reviewer h3{margin:0 0 3px}.cmsarticle .reviewer p{font-size:14px;color:var(--muted);margin:0}.cmsarticle .seal{display:inline-block;margin-top:8px;color:var(--green);font-size:12px;font-weight:850}.cmsarticle .sources{font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:24px}.cmsarticle .sources h2{font-size:25px;margin-top:0}.cmsarticle .sources li{margin-bottom:9px}.cmsarticle .cta{margin-top:34px;padding:27px;border-radius:20px;background:var(--ink);color:#fff}.cmsarticle .cta h2{color:#fff;margin:0 0 7px}.cmsarticle .cta 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h1{font-size:40px}.cmsarticle .dek{font-size:17px}.cmsarticle .layout{gap:26px}.cmsarticle .summary{padding:22px 20px}.cmsarticle article{font-size:16px}.cmsarticle article h2{font-size:28px}.cmsarticle .cards,.cmsarticle .checklist{grid-template-columns:1fr}.cmsarticle .reviewer{grid-template-columns:56px 1fr}.cmsarticle .avatar{width:56px;height:56px;font-size:18px}}\n<\/style>\n<div class=\"cmsarticle\" lang=\"en-GB\">\n<div class=\"page\"><a class=\"back\" href=\"https:\/\/www.costamedicalservices.com\/spain\/medical-library\/\">\u2190 Return to the Medical Library<\/a><\/p>\n<header class=\"hero\" style=\"--hero:url('https:\/\/www.costamedicalservices.com\/wp-content\/uploads\/2026\/09\/hair-07-perdida-peso-glp1.jpg')\">\n<div class=\"hero-copy\">\n<div class=\"eyebrow\">Hair health \u00b7 medical guide<\/div>\n<h1>Hair loss after rapid weight loss or during GLP-1 treatment<\/h1>\n<p class=\"dek\">Why diffuse hair loss may appear after rapid weight loss or during treatment with GLP-1 and how to assess it.<\/p>\n<div class=\"tags\"><span>GLP-1<\/span><span>weight loss<\/span><span>telogen effluvium<\/span><\/div>\n<div class=\"byline\"><span><strong>Reading:<\/strong> 7\u20139 minutes<\/span><span><strong>Updated:<\/strong> September 1, 2026<\/span><span><strong>Medical review:<\/strong> Dr Paola Blanco<\/span><\/div>\n<\/div>\n<\/header>\n<div class=\"layout\">\n<nav class=\"toc\" aria-label=\"Content\"><b>In this article<\/b><a href=\"#resumen\">Summary and conclusions<\/a><a href=\"#s1\">The delay explains the confusion<\/a><a href=\"#s2\">What the Wegovy data says<\/a><a href=\"#s3\">What to check<\/a><a href=\"#s4\">Prognosis and management<\/a><a href=\"#fuentes\">Sources<\/a><\/nav>\n<article>\n<section class=\"summary\" id=\"resumen\">\n<div class=\"summary-label\">Summary and conclusions<\/div>\n<h2>The essentials in less than a minute<\/h2>\n<ul>\n<li>Marked weight loss and nutritional restriction can trigger telogen effluvium, a diffuse and delayed hair loss.<\/li>\n<li>European Wegovy information includes hair loss as a common adverse reaction.<\/li>\n<li>Evaluation data linked many episodes to greater weight loss; They do not allow each case to be attributed to a direct effect of the medication.<\/li>\n<li>A GLP-1 should not be suspended or supplements should be started blindly: the rate of loss, intake, symptoms and other causes must be reviewed.<\/li>\n<\/ul>\n<\/section>\n<section id=\"s1\">\n<h2>The delay explains the confusion<\/h2>\n<p>Telogen effluvium usually appears weeks or months after a trigger: illness, surgery, physiological stress, extreme diet, or marked weight loss. That is why the fall can begin when the person feels better or when the weight has already stabilized.<\/p>\n<p>It is usually diffuse, with more hair when washing or brushing, and can coexist with androgenetic alopecia.<\/p>\n<\/section>\n<section id=\"s2\">\n<h2>What the Wegovy data says<\/h2>\n<p>The European technical information sheet includes hair loss among the common adverse reactions. In the development program, the evaluation report noted more episodes with semaglutide 2.4 mg than with placebo and an association with greater weight losses. The report itself considered a simple direct effect unlikely.<\/p>\n<p>This does not allow diagnosis over the Internet or exact extrapolation of the risk to each GLP-1.<\/p>\n<div class=\"warning\">\n<h3>Do not stop treatment without talking about it<\/h3>\n<p>Stopping can affect weight control and does not immediately correct the hair cycle. First you have to assess severity, nutrition and alternatives.<\/p>\n<\/div>\n<\/section>\n<section id=\"s3\">\n<h2>What to check<\/h2>\n<div class=\"checklist\">\n<div class=\"check\">Speed and magnitude of weight loss<\/div>\n<div class=\"check\">Protein, iron and real dietary variety<\/div>\n<div class=\"check\">Nausea, vomiting or very low intake<\/div>\n<div class=\"check\">Illness, stress, childbirth or recent medication<\/div>\n<\/div>\n<p>Analysis is not mandatory in all cases. They are requested if the history suggests anemia, deficiency, thyroid disorder or another disease.<\/p>\n<\/section>\n<section id=\"s4\">\n<h2>Prognosis and management<\/h2>\n<p>When the trigger is corrected, telogen effluvium usually improves, but the hair takes months to regain visible volume. An adequate diet, avoiding excessively rapid losses and treating digestive symptoms are part of the plan. Plaques, scars, pain, inflammation or loss of eyebrows require a different dermatological assessment.<\/p>\n<\/section>\n<section class=\"related\">\n<h2>Continue on the right route<\/h2>\n<p>Related information and access to medical assessment. Treatment and prescribing decisions require individual review.<\/p>\n<div class=\"related-grid\"><a href=\"https:\/\/www.costamedicalservices.com\/spain\/telehealth\/online-doctor\/\">hair loss<span>Clinical information and consultation<\/span><\/a><a href=\"https:\/\/www.costamedicalservices.com\/spain\/weight-loss-injections\/\">GLP-1<span>Clinical information and consultation<\/span><\/a><a href=\"https:\/\/www.costamedicalservices.com\/spain\/telehealth\/online-doctor\/\">Online medical consultation<span>Clinical information and consultation<\/span><\/a><\/div>\n<\/section>\n<section class=\"reviewer\">\n<div class=\"avatar\">P.B.<\/div>\n<div>\n<h3>Medically reviewed by Dr Paola Blanco<\/h3>\n<p>Medical information reviewed for clinical coherence, safety and source quality.<\/p>\n<p><span class=\"seal\">Spanish medical registration 292891820<\/span><\/div>\n<\/section>\n<section class=\"sources\" id=\"fuentes\">\n<h2>Official and clinical sources<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.ema.europa.eu\/en\/documents\/product-information\/wegovy-epar-product-information_en.pdf\">EMA \u00b7 Wegovy: product information<\/a><\/li>\n<li><a href=\"https:\/\/www.ema.europa.eu\/en\/documents\/assessment-report\/wegovy-epar-public-assessment-report_en.pdf\">EMA \u00b7 Wegovy: public evaluation report<\/a><\/li>\n<li><a href=\"https:\/\/cdn.bad.org.uk\/uploads\/2021\/12\/14161411\/Telogen-effluvium-PIL-Oct-2025.pdf\">British Association of Dermatologists Telogen effluvium<\/a><\/li>\n<\/ol>\n<p>Regulatory information may change. Always check the Summary of Product Characteristics (SmPC) and the leaflet of the dispensed presentation.<\/p>\n<\/section>\n<section class=\"cta\">\n<h2>Do you need a medical evaluation?<\/h2>\n<p>We review pattern, evolution, history and treatments to decide if online management is appropriate or if you need in-person dermatology.<\/p>\n<p><a href=\"https:\/\/www.costamedicalservices.com\/spain\/telehealth\/online-doctor\/\">See medical consultation<\/a><\/section>\n<aside class=\"disclaimer\"><strong>Notice about AI and medical information<\/strong><\/p>\n<p>This article has been prepared with the help of artificial intelligence and may contain errors, inaccuracies or omissions. It is offered as general guidance and never replaces consultation, examination, diagnosis, package insert or pharmaceutical advice. Do not start, stop, or modify medications or delay urgent care based on this content alone.<\/p>\n<\/aside>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"name\":\"Hair loss after rapid weight loss or during GLP-1 treatment\",\"description\":\"Why diffuse hair loss may appear after rapid weight loss or during treatment with GLP-1 and how to assess it.\",\"datePublished\":\"2026-09-01\",\"dateModified\":\"2026-09-09\",\"inLanguage\":\"en-GB\",\"author\":{\"@type\":\"MedicalOrganization\",\"name\":\"Costa Medical Services\"},\"keywords\":\"GLP-1, weight loss, telogen effluvium\",\"url\":\"https:\/\/www.costamedicalservices.com\/spain\/medical-library\/hair-loss-weight-loss-glp-1\/\",\"mainEntityOfPage\":\"https:\/\/www.costamedicalservices.com\/spain\/medical-library\/hair-loss-weight-loss-glp-1\/\",\"publisher\":{\"@type\":\"MedicalOrganization\",\"name\":\"Costa Medical 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