Understanding Hair Loss: Causes, Types and Treatment Options

Understanding Hair Loss: key facts at a glance.

Loads of people end up at a GP or pharmacist about hair loss, yet the whole thing remains widely misunderstood. The headlines around flamboyant celebrity hairstylist Martino Cartier, who renamed himself and is now running as a GOP commissioner candidate, have kicked off a new round of curiosity about how hair thinning actually happens and what can realistically be done.

What follows lays out the main causes, the different types you might come across, and what's available in the UK in terms of treatment. It's general information only, and it's no substitute for advice from your own GP, dermatologist or pharmacist.

What actually causes hair loss?

Hair loss isn't really one condition — it's an umbrella term, and under it sit many separate processes. Genetics carries a lot of weight for many people: if close relatives went thin, chances are you will too. Hormonal shifts play their part as well, which is why thinning often shows up after pregnancy, around menopause, or simply as part of getting older.

Away from genes and hormones, hair can shed because of illness, iron deficiency, thyroid trouble, sudden weight changes, and certain medicines. Stress, whether emotional or physical, is another one — it can shove a big batch of hairs into a resting phase all at once, and then the diffuse thinning becomes visible weeks or months down the line. Seeing a GP is what the NHS advises if hair loss comes on suddenly, appears in patches, or arrives with other symptoms, since an underlying cause can frequently be found and dealt with.

Working out the trigger is honestly the most useful step you can take. A shampoo or supplement bought without knowing why hair is falling out usually disappoints, but correcting a deficiency or tweaking a medicine can actually shift things. Fads sweep through the health space regularly — think of how a new weight loss drug celebrity endorsement can send thousands searching for answers overnight — but clinical evidence, not headlines, should guide what you put on your scalp or in your body.

Which type of hair loss are you dealing with?

Androgenetic alopecia

The most common pattern of hair loss, and it affects men and women alike. Men typically see a receding hairline plus thinning at the crown; women more often get diffuse thinning across the top of the scalp while the hairline itself stays put. Genes and hormonal factors drive it together, and it creeps along gradually over years.

Alopecia areata

An autoimmune condition where the immune system goes after hair follicles, leaving smooth, round patches of loss behind. Scalp, eyebrows, beard area, body hair — any of them can be hit. Some people have one episode and it resolves; others get it coming back, or losing hair more extensively.

Telogen effluvium

A diffuse shedding that kicks in when a trigger — illness, surgery, childbirth, rapid weight loss, emotional stress — pushes a large number of hairs into the resting phase at the same moment. Once the underlying cause sorts itself out it's usually temporary, although full regrowth can take months to show.

Traction alopecia

Hairstyles that pull on the hair over a long stretch are what causes this — think tight braids, buns, extensions, heavy weaves. Change the styling habits early and it's largely preventable.

Scarring alopecias

A cluster of conditions where inflammation wipes out the hair follicle and swaps it for scar tissue, so in those areas regrowth just isn't on the cards. Getting an early referral to a dermatologist matters a great deal here.

When should you see a GP about thinning hair?

Sudden loss, patchy loss, loss that hurts, or anything accompanied by itching, scaling or redness on the scalp — all of those are reasons to book in. Same goes if thinning starts earlier than you'd expect, if it's knocking your mood or confidence, or if you're losing hair alongside other symptoms you can't explain.

Expect your GP to ask about medical history, diet, stress levels, recent illnesses, medicines, and whether anyone in the family has lost hair. Blood tests may follow, usually looking at iron and thyroid — both common contributors and both treatable. Where the cause isn't obvious, a referral to dermatology for a proper look at the scalp might be arranged.

According to the NHS guidance on this, which I last looked at properly a while back, the GP is the starting point for unexplained hair loss, and there's a solid reason: self-diagnosis is unreliable, and some conditions, scarring alopecias in particular, need specialist attention fast.

What are the treatment options available in the UK?

Diagnosis drives treatment, entirely. For androgenetic alopecia there are two medicines licensed in the UK and stocked by pharmacies: minoxidil, a topical solution or foam you put on the scalp, and finasteride, a once-daily tablet for men that a GP prescribes. Neither works well unless you start early and stick with it, and either way you should have a word with a pharmacist or GP about whether they suit you and what the side effects might look like.

Alopecia areata routes more into specialist territory, usually via a dermatologist. Patchy loss is sometimes treated with topical or injected steroids, and for extensive disease other immunosuppressive medicines might come into play. Telogen effluvium tends to settle once the trigger is dealt with, so the real priority there is working out what set it off and managing it — treating an iron deficiency, say, or adjusting a medication.

Traction alopecia is mostly about rethinking hair practices: looser styles, giving the scalp breaks from extensions or weaves, steering clear of tight ponytails. Scarring alopecias need specialist dermatology input and won't respond to over-the-counter products.

Understanding Hair Loss: what it means for you.

Do supplements and special products work?

Evidence is what counts here, and being straight about it. The haircare market is stuffed with products promising regrowth, and the public interest around figures like Martino Cartier — the flamboyant celebrity hairstylist who renamed himself and is now running as a GOP commissioner candidate — shows just how easily commercial claims pick up attention. Not a dig at anyone in particular; just a nudge that celebrity association isn't the same thing as clinical evidence.

A blood test has flagged up iron deficiency? Correcting it can genuinely help. But if your diet's balanced and your bloods are normal, downing biotin or collagen supplements generally won't alter the course of genetic hair loss. The NHS doesn't recommend routine supplements for hair loss in people without a diagnosed deficiency.

Shampoos, serums, scalp massagers — they can make hair feel and look better for a bit, but the underlying cause usually goes untouched. A pharmacist is useful for picking products that won't wind up irritating the scalp, and can flag which claims hold up and which are marketing. Buying medicines or treatments from unregulated sources is risky too — the same caution applies to reports of weight loss drug counterfeit dangers uk regulators have warned about, and it holds for anything you put in or on your body.

How can you look after your hair and scalp day to day?

Practical habits beat expensive products, in my experience. Use a mild shampoo and wash as often as your scalp actually needs — greasy scalps do better with more frequent washing, not less. Tight styles that tug at the roots are worth avoiding, and when hair is wet handle it gently because it breaks more easily then.

Heat tools on high settings can wreck hair shafts and make thinning look worse than it is. Colour or chemical treatments? Give hair time to recover in between, and be aware of the hair dye allergy risks that come with repeated colouring. A varied diet with protein, iron-rich foods, and plenty of fruit and veg supports normal hair growth, though it won't override the genetic hand you've been dealt.

Stress management matters too — not that stress is the only cause of hair loss, but it is one of the triggers for telogen effluvium, and living with hair loss itself can be stressful on top of everything else. Mentioning the mood impact to your GP is a perfectly legitimate reason for an appointment.

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Last updated: 2026-10-29 · Written by the Walton Surgery editorial team · Medical information is for educational purposes only and does not replace advice from a qualified healthcare professional.