Turning 30 does not cause hair loss to accelerate on a fixed timetable. Pattern hair loss can begin at any time after puberty, and its rate varies considerably. It may simply become easier to see in the thirties because gradual changes have accumulated. Sudden shedding at this age can have a different cause altogether.
The NHS says that losing around 50 to 100 hairs a day can be normal. Counting individual hairs is rarely a reliable way to diagnose a problem. A new pattern, a sustained rise in shedding or a visible reduction in density gives a GP or dermatologist more useful information.
Pattern hair loss becomes more common with age
Male pattern hair loss results from a combination of genetics and hormones. In susceptible follicles, dihydrotestosterone (DHT) drives gradual miniaturisation. The hair becomes shorter, finer and lighter before the follicle eventually stops producing visible hair. The usual pattern is recession at the temples with thinning over the top or crown.
This process can start before 30, during the thirties or much later. Age of onset alone does not show how quickly or how far it will progress, and there is no single age at which everybody's hair loss speeds up.
Female pattern hair loss usually appears as a wider central parting and reduced density across the top of the scalp, often with the frontal hairline retained. It involves genetic and hormonal factors, but the role of androgens is less straightforward than it is in men. Many affected women have androgen levels within the normal range.
Sudden shedding is different from pattern loss
Telogen effluvium causes increased shedding from across the scalp rather than a receding hairline or a defined bald area. It commonly begins around three months after a trigger such as:
- illness, fever, surgery or severe physical trauma;
- childbirth or a change to hormonal treatment;
- marked weight loss or extreme dieting;
- a major stressful event; or
- starting a new medicine.
The shedding phase often lasts three to six months, although the previous volume can take longer to return. Sometimes no trigger is found. Telogen effluvium and pattern hair loss can also occur together, so a sudden shed may expose gradual thinning that was already present.
Iron deficiency, thyroid disease and scalp conditions
Iron deficiency and thyroid disease can contribute to diffuse hair loss. A clinician may consider a full blood count, ferritin, thyroid function or other targeted tests when the pattern and history support them. Classic gradual male pattern hair loss does not usually require a broad hormone or vitamin panel.
There is no agreed rule that ferritin must reach 100 micrograms per litre for healthy hair. Ferritin is interpreted using the laboratory range and the wider clinical picture. Inflammation can make a result appear higher, while a low result may indicate depleted iron stores. Take iron supplements only when a clinician has confirmed they are appropriate and considered why the deficiency developed.
Patchy loss may be alopecia areata. Tight hairstyles can produce traction alopecia, while repeated heat or chemical processing can break the hair shaft without causing pattern baldness. Redness, scale, pain, burning or a smooth and shiny scalp may indicate an inflammatory or scarring condition that needs prompt medical review. The clinic's guide to alopecia describes the main patterns.
When to arrange an assessment
See your GP if hair loss is sudden, patchy, rapidly changing or accompanied by scalp symptoms. A medical review is also sensible when hair loss involves the eyebrows or other body hair, follows a new medicine, occurs with fatigue or unexplained weight change, or is affecting your wellbeing.
The NHS advises establishing the cause before approaching a commercial hair clinic. A GP may be able to identify it from the pattern and history, arrange targeted tests or refer to dermatology if the diagnosis remains uncertain.
Treatment should match the cause
Telogen effluvium usually settles after the trigger has resolved, and medication does not make the normal regrowth cycle happen immediately. Confirmed iron deficiency, thyroid disease, a scalp disorder or a medicine-related cause needs its own treatment plan.
For male pattern hair loss, topical minoxidil and prescription finasteride are the main treatments listed by the NHS. They do not work for everyone, and benefit generally lasts only while treatment continues. A prescriber should explain suitability and possible adverse effects before finasteride is started.
Finasteride safety
The MHRA states that finasteride is associated with depression, suicidal thoughts and sexual dysfunction. Sexual dysfunction may persist after treatment has stopped. Before taking finasteride, tell the prescriber about any personal history of depression or suicidal thoughts, and read and keep the patient card and information leaflet supplied with the medicine.
A person taking finasteride 1 mg who develops depression or suicidal thoughts should stop taking it immediately and contact their doctor as soon as possible. Anyone who has seriously harmed themselves or feels at risk of serious harm should call 999 immediately. Contact the prescribing clinician for advice if sexual symptoms develop.
Topical minoxidil may help some women with female pattern hair loss. Women who are pregnant or breastfeeding should not use topical minoxidil. The British Association of Dermatologists also advises avoiding it when planning a pregnancy. A GP or pharmacist can advise on licensed products and individual suitability.
Hair transplantation does not treat temporary shedding or stop surrounding natural hair from thinning. It may be considered for stable, permanent pattern loss when the donor area can provide enough suitable follicles. The clinic's guide to follicular unit extraction (FUE) explains how individual donor grafts are assessed and moved.
What to record before an appointment
Monthly photographs taken in the same position and lighting can show whether a pattern is changing. Note when the loss began, recent illness or surgery, weight change, major stress, new medicines, changes to periods where relevant and any family history of hair loss. This is more useful than estimating the number of hairs shed each day.
This article provides general information and cannot diagnose the cause of hair loss or recommend treatment for an individual reader.
More information on patterns, causes and treatment questions is available in the clinic's hair loss advice hub.
About the author
Dr Harpreet Kalra is a GP and hair-transplant surgeon involved in consultation-led treatment planning at Glasgow Hair Transplant Clinics. His assessments consider the diagnosis, donor area, current pattern of loss and likely future treatment needs.
