Causes of hair loss in women are more varied than many people realise, ranging from hormonal shifts and nutritional deficiencies to autoimmune conditions and medication side effects. Unlike male-pattern baldness, female hair loss often presents as diffuse thinning across the scalp, making it easy to overlook in its early stages. Understanding what is driving the shedding is essential, as treatment depends entirely on the underlying cause. This article outlines the most common and clinically significant causes of hair loss in women, when to seek medical advice, and what diagnostic and treatment options are available through the NHS and privately.
Summary: Hair loss in women is most commonly caused by female-pattern hair loss, telogen effluvium, hormonal changes, nutritional deficiencies, or underlying medical conditions such as thyroid disorders or alopecia areata.
- Female-pattern hair loss (androgenetic alopecia) is the most common cause, producing gradual thinning at the crown and widening of the central parting, often worsening after the menopause.
- Telogen effluvium is a temporary diffuse shedding triggered by stress, illness, surgery, or nutritional deficiency, typically occurring two to three months after the causative event.
- Thyroid disorders, PCOS, and autoimmune conditions such as alopecia areata are important medical causes that require clinical investigation and targeted treatment.
- Low serum ferritin is a common and treatable contributor to hair shedding in women of reproductive age; thyroid function tests and a full blood count are standard first-line investigations.
- Topical minoxidil (2% or 5%) is the only MHRA-licensed topical treatment for female-pattern hair loss in the UK and must be used continuously to maintain benefit.
- Scarring alopecias such as lichen planopilaris and frontal fibrosing alopecia require prompt dermatology referral, as delayed treatment can result in permanent follicle loss.
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Common Causes of Hair Loss in Women
The most common cause of hair loss in women is female-pattern hair loss (androgenetic alopecia), followed by telogen effluvium, traction alopecia, and nutritional deficiencies such as low ferritin.
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Hair loss in women is more common than many people realise, and it can affect women of any age. Unlike male-pattern baldness, female hair loss often presents as diffuse thinning across the scalp rather than a receding hairline, which can make it harder to identify in its early stages.
The most frequently encountered cause is female-pattern hair loss (androgenetic alopecia), a hereditary condition influenced by androgens — male hormones present in small amounts in all women. This type tends to cause gradual thinning at the crown and widening of the central parting, typically becoming more noticeable after the menopause.
Other common causes include:
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Telogen effluvium — a temporary, diffuse shedding triggered by physical or emotional stress, illness, surgery, rapid weight loss, or nutritional deficiencies. Hair typically sheds two to three months after the triggering event.
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Traction alopecia — caused by prolonged tension on the hair follicles from tight hairstyles such as braids, ponytails, or extensions. If persistent, traction alopecia can progress to permanent scarring of the follicle.
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Trichotillomania — a compulsive urge to pull out one's own hair, which can cause patchy hair loss and warrants sensitive clinical assessment and psychological support.
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Central centrifugal cicatricial alopecia (CCCA) — a scarring alopecia that begins at the crown and spreads outwards, disproportionately affecting women with Afro-textured hair; early recognition is important to prevent permanent follicle loss.
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Nutritional deficiencies — particularly low iron or ferritin, which are relatively common in women of reproductive age. Zinc and vitamin D deficiency may also contribute in some cases, though testing for these should be guided by clinical suspicion rather than performed routinely.
Some degree of daily hair shedding is entirely normal. Concern is warranted when shedding noticeably increases, bald patches appear, or hair fails to regrow over several months. The NHS provides further information on hair loss causes and when to seek help.
| Cause | Type of Hair Loss | Key Triggers / Risk Factors | Reversible? | When to See a GP |
|---|---|---|---|---|
| Female-pattern hair loss (androgenetic alopecia) | Gradual thinning at crown, widening central parting | Hereditary; androgens; more noticeable post-menopause | Partially — manageable, not curable | If progressing rapidly or causing distress |
| Telogen effluvium | Diffuse shedding, typically 2–3 months after trigger | Stress, illness, surgery, rapid weight loss, nutritional deficiency | Yes — usually resolves once trigger addressed | If shedding persists beyond several months |
| Alopecia areata | Patchy, well-defined bald areas on scalp or body | Autoimmune; immune system attacks hair follicles | Often — but can progress to alopecia totalis | Promptly; refer to dermatologist if extensive |
| Thyroid disorders (hypo- or hyperthyroidism) | Diffuse thinning across scalp | Thyroid dysfunction disrupts hair growth cycle | Yes — with appropriate thyroid treatment | If accompanied by fatigue, weight changes, or other thyroid symptoms |
| Polycystic ovary syndrome (PCOS) | Female-pattern thinning, accelerated by elevated androgens | Elevated androgens; often with irregular periods, acne, hirsutism | Partially — with hormonal management | If irregular periods, acne, or hirsutism also present |
| Traction alopecia | Hair loss at hairline and temples from follicle tension | Tight braids, ponytails, or extensions worn long-term | Yes if caught early; permanent scarring if prolonged | If hairline recession or scalp scarring is noted |
| Iron / nutritional deficiency | Diffuse shedding; increased hair fragility | Low ferritin or iron; common in women of reproductive age; also zinc, vitamin D | Yes — with correction of deficiency | If shedding coincides with dietary restriction or heavy periods |
Medical Conditions Linked to Female Hair Loss
Thyroid disorders, alopecia areata, and PCOS are among the most clinically significant medical causes of female hair loss, each requiring specific investigation and management.
Several underlying medical conditions can directly contribute to hair loss in women, and identifying these is an important part of clinical assessment. Alopecia areata is an autoimmune condition in which the immune system mistakenly attacks hair follicles, causing patchy, well-defined areas of hair loss on the scalp or elsewhere on the body. It can progress to total scalp hair loss (alopecia totalis) or complete body hair loss (alopecia universalis) in a minority of cases. NICE CKS and the British Association of Dermatologists (BAD) provide detailed guidance on its assessment and management.
Thyroid disorders — both hypothyroidism and hyperthyroidism — are well-established causes of diffuse hair thinning. Thyroid hormones play a key role in regulating the hair growth cycle, and thyroid dysfunction should be excluded in women presenting with unexplained hair loss. Subclinical thyroid dysfunction may occasionally affect hair density, though this is not universal and should be interpreted in the context of the overall clinical picture.
Polycystic ovary syndrome (PCOS) is associated with elevated androgen levels, which can accelerate female-pattern hair loss. It is one of the more common hormonal causes seen in younger women, particularly when accompanied by other features such as irregular periods, acne, or hirsutism.
Other medical conditions linked to hair loss include:
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Lupus (systemic lupus erythematosus) — can cause scarring or non-scarring hair loss
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Coeliac disease — through malabsorption of key nutrients
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Scalp conditions such as seborrhoeic dermatitis, psoriasis, or fungal infections (tinea capitis). Tinea capitis in adults requires scalp scrapings or brushings for mycology and systemic antifungal treatment; topical antifungals alone are insufficient. GP or dermatology input is recommended.
Certain medicines can also cause hair loss as a side effect. Examples include anticoagulants (such as heparin and warfarin), antidepressants, retinoids, antithyroid drugs, beta-blockers, valproate, and some antihypertensives. This list is not exhaustive. If increased hair shedding coincides with starting a new medicine, this should be discussed with a GP or pharmacist rather than stopping treatment abruptly. Suspected adverse drug reactions can be reported via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk.
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How Hormonal Changes Affect Hair Growth
Hormonal shifts during pregnancy, the menopause, and with certain contraceptives can disrupt the hair growth cycle, increasing shedding by pushing follicles prematurely into the resting phase.
Hormones are among the most significant regulators of the hair growth cycle, which consists of three phases: anagen (active growth), catagen (transition), and telogen (resting and shedding). Disruptions to the balance of oestrogen, progesterone, androgens, and thyroid hormones can shift more follicles prematurely into the telogen phase, resulting in increased shedding.
Pregnancy is a well-known example of hormonally driven hair change. Elevated oestrogen levels during pregnancy prolong the anagen phase, meaning many women enjoy thicker, fuller hair. However, following delivery, oestrogen levels drop sharply, triggering a synchronised shedding phase known as postpartum telogen effluvium. This typically begins two to four months after birth and resolves within six to twelve months without treatment, though it can be distressing.
The perimenopause and menopause represent another critical hormonal transition. As oestrogen and progesterone decline, the relative influence of androgens increases, which can accelerate female-pattern hair loss in genetically predisposed women. Many women first notice significant thinning during this period. It is important to note that hormone replacement therapy (HRT) is a treatment for menopausal symptoms and is not licensed for hair loss; any benefit for hair is uncertain.
Hormonal contraception can also influence hair growth. Some progestogen-only contraceptives contain androgenic progestogens that may exacerbate hair thinning in susceptible individuals. Some combined oral contraceptives (COCs) with anti-androgenic properties — such as those containing drospirenone — are sometimes considered in women with androgen-related hair loss, but this represents an off-label use and the evidence base is limited. Any such decision should be made in discussion with a GP or sexual health clinician, taking into account individual risk factors.
Cyproterone acetate, an anti-androgen sometimes used in combination preparations, carries an MHRA safety restriction due to a dose-dependent risk of meningioma (a type of brain tumour). Its use is generally restricted to situations where other options are unsuitable, and it should only be prescribed under specialist supervision with appropriate monitoring.
Women who experience rapid-onset virilisation — such as deepening of the voice, clitoral enlargement, or sudden severe hair loss — should seek urgent medical assessment, as these may indicate an androgen-secreting tumour requiring prompt investigation.
When to See a GP About Hair Loss
You should see a GP if hair loss is sudden, patchy, accompanied by scalp changes or systemic symptoms, or is causing significant psychological distress, as early assessment improves outcomes.
Whilst some hair shedding is a normal part of the hair growth cycle, there are specific circumstances in which it is important to seek medical advice. As a general guide, you should contact your GP if:
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Hair loss is sudden or rapid, occurring over a matter of weeks
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You notice distinct bald patches rather than generalised thinning
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The scalp appears red, scaly, inflamed, painful, or scarred, or there is perifollicular redness around hair follicles
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Hair loss is accompanied by other symptoms such as fatigue, weight changes, irregular periods, acne, hirsutism, or skin changes
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You are losing hair from eyebrows, eyelashes, or other body areas
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You notice broken hairs, scaling, or swollen lymph nodes near the scalp, which may suggest a fungal infection
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You experience rapid-onset virilisation (such as deepening voice or clitoral enlargement), which requires urgent assessment
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Hair loss is causing significant psychological distress or affecting daily functioning
Early assessment is particularly important when scarring alopecia is suspected — conditions such as lichen planopilaris or frontal fibrosing alopecia can cause permanent follicle destruction if left untreated. The sooner these are identified and managed, the better the outcome.
It is also advisable to seek advice if hair loss begins shortly after starting a new medicine, following a significant illness, or during a period of extreme dietary restriction. In these cases, addressing the underlying trigger is often the most effective first step.
GPs can provide initial assessment, arrange relevant blood tests, and refer to a consultant dermatologist where appropriate — this is the standard NHS referral pathway for hair loss. Trichologists are non-medical practitioners and are typically accessed privately rather than through the NHS. The NHS also offers access to psychological support, including NHS Talking Therapies, for those experiencing significant distress related to hair loss, recognising the considerable impact it can have on self-esteem and quality of life.
Diagnosis and Tests Used in the UK
Initial investigation typically includes serum ferritin, thyroid function tests, and a full blood count; hormone profiles and scalp biopsies are reserved for cases with specific clinical indications.
Diagnosing the cause of hair loss in women requires a thorough clinical history, physical examination, and, in most cases, targeted laboratory investigations. A GP will typically begin by asking about the pattern and duration of hair loss, family history, recent illnesses or stressors, dietary habits, and current medicines.
Blood tests are a cornerstone of initial investigation and are selected based on the clinical picture. Commonly used tests include:
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Full blood count (FBC) — to identify anaemia
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Serum ferritin and iron studies — low ferritin is a common and treatable contributor to hair shedding; interpretation should follow local laboratory reference ranges
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Thyroid function tests (TFTs) — to exclude hypothyroidism or hyperthyroidism
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Hormone profile — including testosterone, DHEAS, and sex hormone-binding globulin (SHBG); these are indicated when there are clinical features of hyperandrogenism or PCOS (such as irregular periods, acne, or hirsutism), not as a routine screen for all women with hair loss
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Vitamin D and zinc levels — where deficiency is clinically suspected based on history or risk factors, rather than routinely
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Inflammatory markers and autoimmune screen — if lupus or other systemic conditions are considered
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Scalp scrapings or brushings for mycology — if tinea capitis is suspected, to guide antifungal treatment
This approach is consistent with NICE CKS and Primary Care Dermatology Society (PCDS) guidance, which supports targeted investigation of reversible causes before long-term management strategies are considered.
If the diagnosis remains unclear or a scarring alopecia is suspected, referral to a consultant dermatologist is recommended. Dermatologists may perform a scalp biopsy under local anaesthetic to examine follicular architecture and identify inflammatory changes. Dermoscopy (trichoscopy) — a non-invasive technique using a handheld magnifying device — is increasingly used to assess follicle density, miniaturisation patterns, and scalp health without the need for biopsy in many cases.
Treatment Options Available on the NHS and Privately
Treatment depends on the underlying cause; topical minoxidil is the only MHRA-licensed topical option for female-pattern hair loss, while conditions such as iron deficiency or hypothyroidism are treated directly.
Treatment for female hair loss depends entirely on the underlying cause, and there is no single universal solution. Where a reversible cause is identified — such as iron deficiency, thyroid dysfunction, or nutritional deficiency — correcting the underlying problem is the primary treatment and often leads to significant hair regrowth over several months.
NHS-available treatments include:
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Minoxidil (topical) — available over the counter in 2% and 5% formulations, topical minoxidil is the only MHRA-licensed topical treatment for female-pattern hair loss in the UK. It works by prolonging the anagen phase and increasing follicle size. Results typically take three to six months to become apparent, and treatment must be continued to maintain benefit. Common side effects include scalp irritation, contact dermatitis, and temporary increased shedding in the first few weeks. Unwanted facial hair (hypertrichosis) can occur. Topical minoxidil should not be used during pregnancy or breastfeeding; women of childbearing age should use effective contraception. If significant irritation or any systemic symptoms develop, use should be stopped and medical advice sought. Full prescribing information is available in the product Summary of Product Characteristics (SmPC) on the electronic Medicines Compendium (emc).
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Treatment of underlying conditions — such as levothyroxine for hypothyroidism or iron supplementation for deficiency-related shedding.
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Corticosteroid injections or topical immunotherapy — used for alopecia areata under specialist supervision.
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JAK inhibitors — baricitinib (Olumiant) is licensed in the UK for the treatment of severe alopecia areata in adults. Access on the NHS is subject to specialist assessment and local commissioning arrangements. Other JAK inhibitors may be under evaluation; a specialist dermatologist can advise on current options.
For women with androgen-related hair loss, anti-androgen medicines such as spironolactone may be prescribed off-label by a specialist. Spironolactone requires monitoring of renal function and potassium levels, and effective contraception is essential during treatment due to the risk of feminisation of a male foetus. These medicines are not routinely available on the NHS for hair loss alone.
Cyproterone acetate is subject to MHRA restrictions due to a dose-dependent risk of meningioma and is generally only considered when other options are unsuitable, under specialist supervision with appropriate monitoring and informed consent.
Privately, women may access low-dose oral minoxidil, platelet-rich plasma (PRP) therapy, and low-level laser therapy (LLLT). It is important to be aware that oral minoxidil is not licensed for hair loss in the UK and represents an off-label use; it should only be initiated by a clinician with appropriate monitoring. Cardiovascular side effects — including low blood pressure, fluid retention, rapid heart rate, and, rarely, pericardial effusion — mean it is not suitable for everyone. The evidence base for PRP and LLLT is limited and heterogeneous; results vary considerably by protocol and provider, and neither treatment is currently recommended as standard care. The British Association of Dermatologists and the NHS advise caution when considering unregulated private clinics.
Finasteride and dutasteride are not licensed for use in women and carry a significant teratogenic risk. In exceptional circumstances, off-label use in selected postmenopausal women may be considered by a specialist, but this requires careful discussion of risks and benefits.
Psychological support, including cognitive behavioural therapy (CBT) and counselling via NHS Talking Therapies, is an important adjunct for women experiencing significant distress, and referral can be made through a GP.
Wigs and hairpieces are available on the NHS for certain conditions, including alopecia areata and chemotherapy-related hair loss, subject to local eligibility criteria. Further information is available on the NHS website (NHS: Wigs and fabric supports).
If you suspect that a medicine is causing or worsening your hair loss, you can report this via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk.
Frequently Asked Questions
Can stress really cause hair loss in women?
Yes, significant physical or emotional stress is a well-recognised cause of hair loss in women, known as telogen effluvium. It typically causes diffuse shedding two to three months after the triggering event — such as a serious illness, surgery, bereavement, or extreme dieting — and usually resolves on its own once the stressor is removed.
How do I know if my hair loss is due to a hormonal imbalance?
Hormonal causes of hair loss in women are often suggested by accompanying symptoms such as irregular periods, acne, hirsutism, unexplained weight changes, or hair loss that worsens around the menopause. A GP can arrange targeted blood tests — including thyroid function, hormone profile, and ferritin — to identify hormonal contributors.
What is the difference between female-pattern hair loss and alopecia areata?
Female-pattern hair loss causes gradual, diffuse thinning at the crown and a widening parting, driven by genetic sensitivity to androgens. Alopecia areata is an autoimmune condition that causes sudden, well-defined patchy hair loss and can affect the scalp, eyebrows, eyelashes, or other body areas.
Can the contraceptive pill cause hair loss in women?
Some progestogen-only contraceptives contain androgenic progestogens that may worsen hair thinning in susceptible women. Conversely, certain combined oral contraceptives with anti-androgenic properties are sometimes considered for androgen-related hair loss, though this is an off-label use and should be discussed with a GP or sexual health clinician.
How do I get treatment for hair loss on the NHS?
Start by booking an appointment with your GP, who can take a clinical history, arrange relevant blood tests, and treat any reversible underlying cause such as iron deficiency or thyroid dysfunction. If a specialist diagnosis is needed, your GP can refer you to a consultant dermatologist via the standard NHS referral pathway.
Will hair lost due to nutritional deficiency grow back?
In most cases, yes — hair loss caused by nutritional deficiencies such as low ferritin or vitamin D tends to be reversible once the deficiency is corrected. Regrowth is gradual and typically takes several months, so it is important to address the underlying deficiency rather than rely on topical treatments alone.
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