Hair Loss FAQ: Causes, Treatments, Shedding & Regrowth

Common causes include androgenetic alopecia, telogen effluvium, postpartum shedding, traction, some scalp disorders and other medical or nutritional factors. The pattern, timing and medical history help narrow down the likely cause.

If the loss is sudden, patchy, painful or unexplained, seek appropriate clinical review rather than assuming it is standard pattern hair loss.

Genetic pattern hair loss usually develops progressively over time. Men may notice recession or crown thinning, while women often notice widening of the central part or reduced density over the top of the scalp.

Telogen effluvium more often causes a noticeable increase in diffuse shedding after a trigger such as illness, significant stress, weight change, pregnancy or another physiological event. Read our telogen effluvium guide.

Hair-growth treatment is normally judged over months rather than weeks. For licensed finasteride 1 mg, current UK product information states that around three to six months of daily treatment may be required before stabilisation becomes apparent.

Exact timelines vary by treatment, diagnosis and individual response. Long-term treatments also generally require continued use to maintain benefit.

Some people report a temporary increase in shedding after starting certain hair-growth treatments. However, not every episode of new shedding should automatically be attributed to treatment.

If shedding is severe, prolonged or accompanied by other symptoms, contact your prescriber or another healthcare professional.

Not everyone needs blood tests. They may be considered when the history suggests diffuse or unexplained shedding, symptoms of an underlying medical condition or other relevant clinical concerns.

Which tests are appropriate depends on the individual history and should be decided by the clinician assessing the hair loss.

Seek assessment if hair loss is sudden, patchy, severe, associated with scalp pain or inflammation, accompanied by other health symptoms, or does not fit a typical pattern of gradual androgenetic hair loss.

Female pattern hair loss is a common cause of progressive thinning, but women can also develop telogen effluvium, postpartum shedding, traction-related loss and other medical or scalp conditions.

Read our female hair loss treatment guide for a fuller comparison.

Female pattern hair loss commonly causes gradual reduction in density over the top of the scalp and widening of the central part. It typically progresses rather than appearing as a sudden episode of heavy shedding.

Increased diffuse shedding after childbirth is common and is usually a form of telogen effluvium. Many women recover gradually as the hair cycle normalises.

If the shedding is unusually severe, persistent, patchy or accompanied by progressive widening of the part, further assessment can help. See the postpartum hair loss guide.

Yes. Licensed topical minoxidil products have a role in androgenetic alopecia in women. Suitability still depends on the cause of the hair loss, the specific product and individual safety factors.

Explore our topical minoxidil pathway.

Current UK product information for licensed topical minoxidil for women states that it should not be used during pregnancy or lactation. Always disclose pregnancy, breastfeeding or plans to conceive during an assessment.

Hair changes may become more noticeable around midlife, but not every case of thinning should be attributed to menopause alone. Genetics, female pattern hair loss, shedding disorders and other health factors can also contribute.

Male pattern hair loss is androgenetic alopecia. Hair follicles in susceptible scalp areas are sensitive to androgens, including dihydrotestosterone, which contributes to progressive follicle miniaturisation.

If recession or crown thinning is progressing and treatment matters to you, it is reasonable to seek assessment rather than waiting for advanced loss. The appropriate treatment depends on medical history, goals and tolerance for risk.

Finasteride and minoxidil work differently. Finasteride inhibits type II 5-alpha reductase and reduces conversion of testosterone to DHT, while minoxidil is a hair-growth treatment with a different mechanism.

Read our minoxidil vs finasteride comparison.

Topical finasteride applies finasteride directly to the scalp rather than using the standard licensed 1 mg oral tablet route. Compounded topical treatment is not the same as a licensed oral finasteride product and requires individual prescribing assessment.

Explore the topical finasteride pathway or read our topical finasteride vs dutasteride comparison.

Dutasteride inhibits both type I and type II 5-alpha reductase. A compounded topical dutasteride pathway is an unlicensed treatment route and should only be considered following individual clinical assessment.

Explore our topical dutasteride pathway.

Many treatments only maintain their benefit while they are being used. For licensed finasteride 1 mg, current UK product information states that benefit begins to reverse after stopping and can return towards baseline over subsequent months.

This needs individual clinical discussion. Finasteride product information contains pregnancy precautions, including advice relating to exposure of pregnant women to crushed or broken tablets. Discuss conception plans with the prescriber rather than relying on general online advice.

Keep the routine manageable. Use prescribed treatment as directed, avoid unnecessary changes, and look after scalp health. Tight hairstyles, aggressive brushing and untreated scalp irritation can make a routine harder to tolerate.

Some treatment combinations are used, but suitability depends on the diagnosis, medical history, formulation and tolerability. More ingredients do not automatically mean a better treatment.

The Hair Customiser can be used to request a personalised route for prescriber assessment.

Side effects depend on the medicine. Review the information supplied with your treatment and contact the prescriber if you develop concerning symptoms.

For more detail, read our finasteride side effects and minoxidil side effects guides.

Irritation may come from the active ingredient, the vehicle, another scalp condition or the wider routine. Persistent redness, scaling, pain or significant itch should be assessed rather than simply applying more treatment.

Yes. A compounded topical prescription can be personalised where clinically appropriate, but every requested ingredient and strength should still be reviewed individually. The aim is an appropriate, usable formulation rather than the strongest possible mixture.