What Causes Hair Loss in Women?

What Causes Hair Loss in Women?

Hair loss in women is rarely down to one single thing. It's usually a mix of genetics, hormones, medical conditions, stress, and nutrition all pulling in the same direction. That's why two women with seemingly identical thinning can end up with completely different diagnoses and treatment plans.

How Common Is Hair Loss in Women?

More common than most people realise. Hair loss is often framed as a men's issue, but women make up a huge share of sufferers. It's not rare, it's not vanity, and it's not something you just have to live with.

84% of London clinics on Clinic Reccy offer Free Consultation

What Are the Most Common Causes of Hair Loss in Women?

Doctors typically group the causes into a few broad buckets. Here are the ones that come up most often in practice:

• Female pattern hair loss (androgenetic alopecia) — genetic sensitivity to androgens, causing gradual thinning at the crown and widening of the part.
• Telogen effluvium — a temporary shedding phase triggered by stress, illness, surgery, childbirth, or rapid weight loss.
• Hormonal imbalances — thyroid disorders (hypo- or hyperthyroidism), PCOS, and menopause-related oestrogen shifts.
• Nutritional deficiencies — low iron/ferritin, vitamin D, zinc, and B12 are common contributors.
• Alopecia areata — an autoimmune condition causing patchy bald spots.
• Traction alopecia — hair loss from tight hairstyles, braids, or extensions pulling on the follicles.
• Medications — certain antidepressants, blood thinners, chemotherapy, and hormonal treatments.
• Scalp conditions — psoriasis, seborrheic dermatitis, and fungal infections.

Which Cause Is Most Likely Behind Female Pattern Hair Loss?

If your hair is thinning gradually along the part line and at the crown — while the front hairline stays largely intact — female pattern hair loss is the most likely diagnosis. It's driven by a combination of genetics and androgen sensitivity, and it tends to run in families. Here's how it compares to the other big cause of diffuse shedding:

What Medical Conditions and Treatments Can Trigger Hair Loss in Women?

A surprising number of medical issues show up first as hair shedding. If your hair loss started suddenly or came with other symptoms, it's worth getting bloodwork done. Common medical triggers include:

• Thyroid disease — both underactive and overactive thyroid can cause diffuse shedding.
• Polycystic ovary syndrome (PCOS) — elevated androgens drive male-pattern thinning in women.
• Iron deficiency anaemia — low ferritin is one of the most overlooked causes.
• Autoimmune conditions — lupus and alopecia areata both attack hair follicles.
• Chemotherapy and radiation — cause rapid, widespread hair loss.
• Certain medications — including some antidepressants, beta-blockers, and hormonal contraceptives.
• Childbirth — postpartum shedding is a common temporary trigger.
• Menopause — falling oestrogen and rising androgen ratios thin the hair over time.

How Do Lifestyle and Nutritional Factors Contribute to Hair Loss in Women?

Hair is one of the first things your body sacrifices when resources are tight. Crash diets, chronic stress, poor sleep, and smoking all take a toll. The good news is that many of these factors are fixable, and hair often recovers once they're addressed.

• Low-protein diets — hair is made of keratin, so protein matters.
• Iron and ferritin deficiency — common in menstruating women and vegetarians.
• Vitamin D deficiency — linked to both telogen effluvium and alopecia areata.
• Zinc and B12 deficiency — impair follicle growth and repair.
• Crash dieting and rapid weight loss — a classic trigger for telogen effluvium.
• Chronic stress — raises cortisol, which disrupts the hair growth cycle.
• Smoking — reduces blood flow to the scalp and accelerates ageing of follicles.
• Tight hairstyles — braids, weaves, and extensions can cause traction alopecia over time.

When Should You See a Doctor or Specialist About Hair Loss?

Don't wait until you can see your scalp through your hair. Early intervention almost always produces better results. Here's a sensible step-by-step approach:

• Step 1: Track your shedding — note how much comes out when washing and brushing.
• Step 2: See your GP for bloodwork — full blood count, ferritin, thyroid panel, vitamin D, B12, and hormones.
• Step 3: Review your medications with your doctor — some may be contributing.
• Step 4: If bloodwork is normal and thinning continues, ask for a referral to a dermatologist or trichologist.
• Step 5: Consider a consultation with a hair restoration clinic if pattern hair loss is confirmed.
• Step 6: Get a scalp biopsy or trichoscopy if the diagnosis is unclear.

What Treatment Options Exist for Female Hair Loss?

Treatment depends entirely on the cause. Telogen effluvium often resolves on its own once the trigger is removed. Female pattern hair loss, on the other hand, needs ongoing management. Here's how the main options compare:

If you're considering a transplant, it's worth understanding what's involved before you book anything. Our guide to hair transplant procedures for women covers candidacy, techniques, and recovery in plain English.

Costs vary widely depending on the clinic, the number of grafts, and the stage of hair loss. For a broader look at what different clinics charge and what's included, see our hair transplant cost guide.

Frequently Asked Questions About Hair Loss in Women