Women’s hair loss: trichologist outlines causes and what helps

Women’s Health UK has published new guidance from consultant trichologist Anabel Kingsley, who outlines the most common reasons women notice thinning and what practical checks can help. Her advice spans perimenopause, postpartum changes, nutrition, stress and newer medicines linked to shedding.

Who What Wear separately reports that, despite a crowded market, relatively few hair-loss products have strong trichologist backing, underscoring the importance of diagnosis and targeted care before buying treatments.

What happened

According to Women’s Health UK, Kingsley emphasises that women’s hair loss needs a whole-person view, with attention to hormones, blood health, gut and scalp. She highlights heavy periods, iron deficiency, perimenopause and menopause, stress and medical treatments as frequent contributors.

She advises that iron and ferritin (iron storage), vitamin B12 and vitamin D are key labs worth checking when shedding appears, noting that deficiencies are common and correctable. She also points to thyroid problems as an under-recognised cause of hair thinning symptoms in midlife.

On perimenopause and menopause, Kingsley notes that falling oestrogen can change the skin and how follicles sit in the scalp. She adds that thinner coverage after menopause can leave follicles more exposed to UV, making a hat a sensible safeguard on sunny days.

Postpartum, she urges women not to assume all shedding is routine. According to Women’s Health UK, she flags iron and broader nutritional shortfalls, stress and underlying conditions as issues that can complicate recovery from post-birth hair fall.

Kingsley tells Women’s Health UK that rapid weight loss is a well-known trigger for telogen effluvium, a temporary shedding that typically lasts three to six months. She reports seeing some GLP‑1 users continue shedding beyond this window, suggesting an ongoing disruption to the hair cycle in a subset.

She adds that inadequate calorie intake or low iron, vitamin D or B12 could be at play when shedding persists on GLP‑1 therapy, and raises the possibility of gut microbiome effects. As she puts it, “Hair follicles are very metabolically active and need calories,” from food first.

On treatments, Kingsley cautions against starting minoxidil pre-emptively to prevent potential GLP‑1 shedding, arguing it is a medicine best used for the right diagnosis and at the right time, ideally with professional input.

The background

Dermatologists generally agree that women’s thinning has multiple overlapping causes, including telogen effluvium from illness, stress or nutritional gaps, and female pattern hair loss driven by follicle sensitivity to androgens. Our explainer on female pattern baldness: signs, causes and treatment options outlines how widening parts and diffuse crown thinning often present.

Telogen effluvium typically follows a trigger by several weeks and can settle once the cause is addressed. Women’s Health UK notes that a typical episode lasts months, but repeat or prolonged triggers can prolong shedding, which is why identifying and correcting contributors matters.

Clinicians commonly start with history, examination and a few blood tests, prioritising ferritin, full blood count, vitamin B12 and vitamin D, and assessing thyroid function where symptoms suggest it. This aligns with Kingsley’s emphasis on checking the basics early to avoid missing fixable issues.

Heavy menstrual bleeding is a frequent, overlooked source of iron deficiency in women of reproductive age. Women’s Health UK highlights that even “normalised” heavy periods can deplete ferritin over time, which may worsen postpartum shedding or midlife thinning until treated.

Perimenopause brings fluctuating hormones that can unmask or accelerate pattern thinning in genetically susceptible women. Dermatologists often see this alongside drier scalps and increased sensitivity, making gentle scalp care and UV protection useful adjuncts rather than cures.

Stress is a recognised driver of telogen effluvium via hormonal and inflammatory pathways. If shedding surges after a major stressor, our guide to does stress cause hair loss? Signs, timing and recovery explains what to expect and how recovery usually unfolds.

It is also helpful to understand what “normal” daily shedding looks like and when to seek help. Our primer on how much hair loss is normal — and when to worry walks through typical ranges and red flags that merit a GP or dermatology review.