Hair loss after COVID is one of the more distressing symptoms reported by people recovering from infection, including those experiencing long COVID. Most cases are caused by telogen effluvium — a temporary, stress-induced form of diffuse hair shedding — triggered by the physiological burden of SARS-CoV-2 infection. Understanding why this happens, how long it typically lasts, and when to seek medical advice can help reduce anxiety and ensure any underlying causes are identified and treated promptly. This article explains the mechanisms, prevalence, NHS treatment options, and practical self-care steps to support recovery.

Why COVID-19 Can Cause Hair Loss

COVID-19 triggers telogen effluvium by acting as a significant physiological stressor, causing a large proportion of hair follicles to simultaneously enter the resting phase, with shedding occurring two to three months later.

Hair loss after COVID-19 is most commonly attributed to a condition called telogen effluvium — a well-recognised, temporary form of diffuse hair shedding triggered by physiological stress. Under normal circumstances, hair follicles cycle through growth (anagen), transition (catagen), and resting (telogen) phases. When the body experiences significant physical or emotional stress — such as a serious viral infection, high fever, or prolonged illness — a large proportion of hair follicles can simultaneously shift into the telogen (resting) phase. Approximately two to three months later, this hair sheds in noticeable quantities. Telogen effluvium characteristically causes diffuse thinning across the scalp, which distinguishes it from patchy hair loss (as seen in alopecia areata) or scarring alopecias.

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The SARS-CoV-2 virus can act as a potent physiological stressor in several ways. Systemic inflammation, elevated cytokine levels, and the psychological burden of illness may all contribute to disrupting the normal hair growth cycle. Nutritional depletion — particularly of iron and zinc — following a significant illness may compound shedding, though the evidence for a direct causal role of vitamin D deficiency in telogen effluvium specifically is inconsistent; testing and replacement should be guided by clinical assessment rather than assumed. Hospitalised patients or those who experienced severe illness appear to be at higher risk, though telogen effluvium has also been reported following mild COVID-19 infection.

It is important to note that COVID-19 may also unmask or exacerbate pre-existing conditions such as androgenetic alopecia (pattern hair loss) or alopecia areata (an autoimmune condition causing patchy hair loss), though the evidence base for this remains evolving. In most cases, hair loss represents a secondary response to the body's stress reaction rather than a direct consequence of viral damage to the follicle itself. Further information is available from the British Association of Dermatologists (BAD) and the Primary Care Dermatology Society (PCDS).

How Common Is Hair Loss After COVID Infection?

Post-COVID hair loss is among the more commonly reported long COVID symptoms; the vast majority of cases are self-limiting, though prevalence estimates vary widely across studies.

Post-COVID hair loss has been reported as one of the more commonly described symptoms of long COVID — the term used to describe ongoing symptoms persisting beyond four weeks after initial infection (as defined by NICE guideline NG188). Prevalence estimates vary considerably depending on study design, population, and illness severity; figures cited in published literature range widely, and a single reliable estimate is difficult to establish. Self-reported data from the Office for National Statistics (ONS) long COVID symptom surveys have included hair loss among symptoms reported by a proportion of those with ongoing post-COVID complaints, alongside fatigue, breathlessness, and cognitive difficulties, though its relative frequency varies across datasets and should be interpreted with caution given the self-reported nature of the data.

The condition appears to affect people of all ages and both sexes. Some studies suggest it may be reported more frequently in women, though this may partly reflect greater awareness or reporting of hair changes rather than a true biological difference, and the evidence is not conclusive.

Telogen effluvium following viral infections — including influenza and other febrile illnesses — has been documented in medical literature for decades. What has made post-COVID hair loss particularly prominent is the scale of the pandemic and the volume of people affected simultaneously. Reassuringly, the vast majority of cases are self-limiting, meaning the hair loss resolves without specific medical treatment, though this can understandably cause significant distress while it is occurring. For UK prevalence context, the ONS self-reported long COVID symptoms dataset and UKHSA/NIHR evidence summaries provide the most relevant national data.

When to Seek Medical Advice from Your GP

Consult your GP if shedding is severe or persists beyond six months, if patchy or scarring hair loss is present, or if symptoms suggest an underlying condition such as thyroid disease.

While post-COVID hair loss is usually benign and self-resolving, there are circumstances in which it is important to consult your GP. You should book an appointment if:

• Hair shedding is severe, prolonged, or worsening beyond six months after your COVID-19 infection

• You notice patchy or circular bald areas rather than diffuse thinning across the scalp

• There are signs that may suggest scarring alopecia — such as redness, scaling, pain, or tenderness of the scalp — which warrants prompt assessment

• In children, hair loss accompanied by scalp scaling, broken hairs, or swollen lymph nodes may indicate tinea capitis (a fungal infection), which usually requires systemic antifungal treatment and should be assessed promptly

• Hair loss is accompanied by other symptoms such as fatigue, unexplained weight changes, feeling cold, or dry skin — which may suggest an underlying thyroid disorder

• You are experiencing significant psychological distress as a result of hair loss

• There is a family history of autoimmune conditions or you have been previously diagnosed with alopecia areata

• You have recently started a new medication, as drug-induced telogen effluvium is a recognised cause

Your GP will typically take a thorough history and may arrange blood tests to identify contributing or coincidental causes. In line with PCDS guidance, a baseline panel commonly includes a full blood count (FBC), ferritin (iron stores), and thyroid function tests (TFTs). Additional tests — such as B12 and folate, urea and electrolytes (U&E), liver function tests (LFTs), CRP or ESR, coeliac serology, or zinc — may be requested where clinically indicated. Vitamin D testing is not routinely required unless there is a specific clinical reason to suspect deficiency.

If an underlying cause is identified — such as iron deficiency or hypothyroidism — treating that condition is the priority. Your GP may refer you routinely to a dermatologist if the diagnosis is uncertain, hair loss is atypical, or there is extensive or treatment-resistant alopecia areata. Urgent referral is warranted if scarring alopecia is suspected, as early treatment may limit permanent follicle damage. NICE guideline NG188 on the long-term effects of COVID-19 supports holistic assessment and onward referral where symptoms significantly impair quality of life.

Treatments and Support Available on the NHS

Most post-COVID telogen effluvium requires no pharmacological treatment; identified deficiencies such as iron deficiency are treated, and severe alopecia areata may qualify for specialist treatments including NICE-approved baricitinib.

For the majority of people experiencing telogen effluvium following COVID-19, no specific pharmacological treatment is required. The primary approach is supportive — addressing any identified nutritional deficiencies, managing stress, and allowing time for the natural hair cycle to restore itself.

If blood tests confirm iron deficiency or iron deficiency anaemia, your GP may prescribe iron supplementation, which is associated with improved outcomes in deficient individuals. Vitamin D supplementation may be recommended if a deficiency is confirmed on testing. It is important not to self-start iron or vitamin D supplements without confirmed deficiency, as excess intake carries risks and is not supported by evidence in the absence of a deficiency.

A specific note on biotin (vitamin B7): high-dose biotin supplements — often marketed for hair, skin, and nails — can interfere with a range of laboratory tests, including thyroid function tests and troponin assays, potentially causing misleading results. The MHRA has issued a Drug Safety Update on this risk. If you are taking biotin supplements, inform your GP or any healthcare professional before blood tests are taken.

For those with confirmed alopecia areata triggered or worsened by COVID-19, treatment options available through the NHS include topical corticosteroids, intralesional steroid injections administered by a dermatologist, and in some cases immunotherapy. JAK inhibitors — specifically baricitinib (Olumiant) — have been approved by the MHRA and recommended by NICE for severe alopecia areata in adults meeting specific eligibility criteria (please refer to the current NICE technology appraisal for baricitinib in alopecia areata for up-to-date criteria). Baricitinib is a specialist-initiated treatment, prescribed and monitored by a dermatologist; it is not used for telogen effluvium and carries important risks and monitoring requirements as detailed in the MHRA/EMC Summary of Product Characteristics. Any suspected side effects from medicines should be reported via the MHRA Yellow Card Scheme (available at yellowcard.mhra.gov.uk).

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For coexisting androgenetic alopecia (pattern hair loss), topical minoxidil is available over the counter and may be discussed with your GP or dermatologist; it is not routinely prescribed on the NHS but is a recognised treatment option.

The NHS also recognises the psychological impact of hair loss. Patients experiencing distress may be referred to talking therapies through the NHS Talking Therapies programme, or signposted to Alopecia UK, a charity offering peer support, information, and helpline services. Some NHS dermatology departments offer access to hair and scalp specialists or clinical nurse specialists, though availability varies between trusts — your dermatologist or GP can advise on what is available locally. Wigs and hairpieces may be available on the NHS for those with significant hair loss; eligibility is subject to local policy, and prescription charges usually apply in England unless you are exempt. The NHS 'Help with health costs' pages provide further guidance on eligibility and charges.

How Long Does Post-COVID Hair Loss Last?

Post-COVID telogen effluvium is temporary in the vast majority of cases, with regrowth beginning within three to six months and full density typically restored within twelve months.

One of the most reassuring aspects of telogen effluvium — the predominant form of hair loss after COVID-19 — is that it is temporary in the vast majority of cases. Once the triggering stressor has resolved and the body begins to recover, hair follicles gradually return to their normal growth cycle. Most people begin to notice new hair regrowth within three to six months of the initial shedding, though it can take up to twelve months for hair density to return to its pre-illness baseline.

It is worth understanding that the shedding phase and the regrowth phase do not always feel distinct. Many people notice short, fine hairs — sometimes called 'baby hairs' — appearing at the hairline or across the scalp as a sign that regrowth is underway. This is a positive indicator that the follicles remain healthy and active.

If significant shedding continues, or if regrowth appears minimal after six to twelve months, it is advisable to return to your GP for re-assessment. This is important to reassess for underlying causes that may have been missed or that have developed since the initial consultation. Persistent hair loss is more likely if there is an underlying condition such as androgenetic alopecia that has been unmasked or accelerated by the illness, if nutritional deficiencies remain uncorrected, or if chronic psychological stress — which is common in those living with long COVID — is perpetuating the telogen effluvium. In these cases, ongoing GP review and possible dermatology referral are advisable. Patience remains central to recovery, as hair growth is inherently a slow biological process.

Looking After Your Hair and Scalp During Recovery

Gentle hair care, a balanced diet rich in protein, iron, and zinc, and stress management support recovery; routine high-dose supplementation is not recommended without confirmed deficiency.

Whilst waiting for hair to regrow, there are several practical steps you can take to support scalp health and minimise further unnecessary shedding.

Gentle hair care is paramount — avoid tight hairstyles such as high ponytails, braids, or buns that place traction on already-fragile hair. Reduce the frequency of heat styling, and use a wide-toothed comb rather than a brush on wet hair to limit mechanical breakage. During active shedding, it is also advisable to avoid harsh chemical treatments such as bleaching, perming, or relaxing, as these can further weaken fragile hair shafts.

From a nutritional standpoint, ensuring a balanced, varied diet in line with the NHS Eatwell Guide — rich in protein, iron, zinc, and B vitamins — supports the conditions needed for healthy hair growth. Avoid crash dieting or severely restrictive eating, as rapid calorie or protein restriction is itself a recognised trigger for telogen effluvium. Good dietary sources include:

• Iron: red meat, lentils, spinach, fortified cereals

• Zinc: pumpkin seeds, chickpeas, dairy products

• Biotin and B vitamins: eggs, nuts, wholegrains

• Protein: lean meat, fish, legumes, tofu

Unless a specific deficiency has been confirmed by blood tests, routine supplementation with high-dose hair, skin, and nail supplements is not routinely recommended, as evidence for their efficacy in the absence of deficiency is limited. Some supplements can interfere with medications or cause adverse effects in high doses. In particular, high-dose biotin can interfere with laboratory tests including thyroid function tests and troponin assays — always inform your GP or healthcare team if you are taking biotin before having blood tests (MHRA Drug Safety Update).

Managing stress and sleep is equally important, as both have a direct influence on the hair growth cycle. Gentle exercise, mindfulness, and adequate rest all contribute to overall recovery from long COVID and may indirectly support hair regrowth. If you find the emotional impact of hair loss is affecting your daily life or mental wellbeing, do not hesitate to speak to your GP or seek support through NHS Talking Therapies — looking after your mental health is just as important as caring for your scalp.

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