Hair Loss in Women: Causes, Telogen Effluvium, PCOS & Regrowth

What Is Hair Loss in Women?

Signs & Patterns to Notice

Hair loss shows up in different ways depending on the cause. Noticing which pattern fits you — and any clues elsewhere in your body — helps point to the reason.

What Causes Hair Loss in Women?

There are several common reasons women lose hair, and more than one can be at play at once. The good news is that most are temporary or treatable once identified. Here are the patterns to know.

Telogen effluvium (stress, illness & postpartum shedding)

This is the most common type of hair loss in women — a temporary surge in shedding triggered by a physical or emotional stress on the body. Common triggers include a high fever, a viral illness or infection, surgery, childbirth, crash dieting or rapid weight loss, and periods of intense emotional stress or grief. Because of how the hair cycle works, the shedding usually appears 2–3 months after the trigger, then settles and regrows over the following months. The all-over thinning can feel frightening, but it is rarely permanent.

Postpartum hair shedding

Many women notice heavy shedding a few months after giving birth. During pregnancy, hormonal changes keep more hair in its growing phase, so hair often feels fuller; after delivery, that extra hair shifts into shedding all at once. It can look dramatic, but it's a normal, temporary form of telogen effluvium and usually settles over several months as your hair cycle rebalances.

Iron deficiency & anaemia

Low iron is a common and very checkable cause of hair loss in women, particularly with heavy periods, a diet low in iron, or during and after pregnancy. Iron deficiency can also bring tiredness, breathlessness and looking pale. A simple blood test can identify it, and treating the deficiency — with diet and, where a doctor advises, supplements — often helps hair recover.

Thyroid problems

Both an under-active thyroid (hypothyroidism) and an over-active thyroid (hyperthyroidism) can cause hair to thin. Thyroid issues often come with other clues — changes in weight, energy, mood, periods, or feeling unusually hot or cold. A blood test checks thyroid function, and treating the thyroid usually improves the hair over time.

PCOS & the androgen link

Polycystic ovary syndrome (PCOS) can raise androgen ('male-type' hormone) levels, which in some women leads to thinning over the top of the scalp — sometimes alongside other signs like irregular periods, acne or extra hair growth on the face or body. This hormonal pattern is one of the more treatable causes; addressing the underlying PCOS often helps the hair.

Female-pattern hair loss

This is a gradual thinning over the top and crown of the scalp, often showing as a widening parting, while the hairline usually stays put. It tends to run in families and becomes more common with age, especially around and after menopause. It develops slowly rather than as sudden shedding, and a dermatologist can advise on treatments that help slow it and support regrowth.

Styling, scalp & other causes

Tight hairstyles (tight buns, braids or ponytails), frequent heat styling, harsh chemical treatments and rough handling can stress hair and, over time, cause traction-related loss. Scalp conditions, certain medicines, and very restrictive diets lacking protein or key nutrients can also contribute. Some hair loss has other medical causes — which is another reason to get the cause checked rather than guessing.

Treatment & What Helps

The right approach depends on the cause — which is why finding it comes first. For many women, treating an underlying issue (or simply waiting out temporary shedding with good care) is enough. Here's how the main causes are generally approached.

Telogen effluvium / postpartum shedding

Usually no specific treatment is needed — it tends to recover on its own as the trigger passes. The focus is gentle hair care, good nutrition, managing stress and patience while the hair cycle rebalances over several months.

Iron deficiency / anaemia

Identified with a blood test and treated by addressing the cause and raising iron through diet and, where a doctor advises, supplements. Hair often improves as iron levels recover. Don't start iron supplements on your own — get tested first.

Thyroid problems

Diagnosed with a blood test and managed with treatment guided by a doctor. As thyroid function is brought back into balance, the hair usually improves over time.

PCOS / hormonal hair loss

Managed by addressing the underlying PCOS with a doctor — which may include lifestyle steps and, where appropriate, specific medical options. See our PCOS and hormonal-health guides for more.

Female-pattern hair loss

A dermatologist can advise on treatments that may slow thinning and support regrowth. Outcomes vary by individual, and these are best discussed and monitored with a specialist.

Styling-related loss

Easing off tight styles, heat and harsh chemical treatments, and handling hair gently, gives it the best chance to recover — the sooner the better.

Gentle Care at Home

Whatever the cause, treating your hair kindly and feeding it well gives it the best chance to recover and protects what you have. These everyday habits matter most when done consistently.

When to See a Doctor or Dermatologist

Please see a doctor or dermatologist if:

• Your hair loss is troubling you or affecting how you feel about yourself
• Shedding hasn't settled after several months, or thinning is clearly getting worse
• You have irregular periods, acne or extra facial or body hair alongside thinning (possible PCOS)
• You're unsure of the cause and want it checked properly
• You want advice on treatments for gradual (female-pattern) thinning

Frequently Asked Questions