Thinning Hair: Causes, Proven Treatments and When to See a Doctor

HealthfulBlog Staff — Mon, 27 Mar 2023 14:04:29 +0000

Noticing more hair in your brush, a wider part or a receding hairline? Thinning hair is extremely common in both men and women, and the good news is that several treatments are proven to slow it down or even regrow hair, as long as you start early and match the treatment to the cause. This guide explains why hair thins, what actually works, and when it’s time to see a dermatologist.

Key takeaways

Losing 50 to 100 hairs a day is normal.
Pattern hair loss, which is hereditary, is the most common cause in both men and women.
Minoxidil and finasteride are the best-known proven treatments, but they take months to work.
Sudden or patchy hair loss should be checked by a doctor.

How much hair loss is normal?

Most people lose 50 to 100 hairs a day as part of the normal hair growth cycle (Mayo Clinic). Thinning becomes noticeable when hair falls out faster than it grows back, or when new hairs grow back finer and shorter.

The most common causes of thinning hair

Type	What it looks like	Main cause
Pattern hair loss	Receding hairline in men; widening part in women	Heredity and aging
Telogen effluvium	Handfuls of hair when combing or washing	Physical or emotional stress, illness, childbirth
Alopecia areata	Sudden round bald patches	Immune system
Traction alopecia	Thinning along the hairline or part	Tight braids, ponytails or rollers
Medical causes	Diffuse thinning	Thyroid problems, some medications, scalp infections

Source: Mayo Clinic, Hair loss: symptoms and causes.

Knowing the cause matters, because the right treatment is different for each. Stress-related shedding often settles by itself once the trigger passes, while pattern hair loss usually keeps progressing without treatment.

How doctors find the cause

A dermatologist will look at your scalp and the pattern of loss, and may use a few simple tests: blood tests to check for medical conditions, a pull test to see how many hairs come out with gentle tugging, a close look at hairs under a microscope, and sometimes a small scalp biopsy (Mayo Clinic).

Treatments that actually work

Minoxidil (Rogaine)

Minoxidil is an over-the-counter liquid or foam applied to the scalp. Mayo Clinic advises applying it once daily for women and twice daily for men, and notes it takes at least six months to see whether it is working. Possible side effects include scalp irritation and unwanted hair growth on the face or hands.

Finasteride (Propecia)

Finasteride is a daily prescription pill for men. Many men see their hair loss slow down and some regrow hair, but it can take several months to tell. Rare side effects include reduced sex drive; discuss the risks with your doctor (Mayo Clinic).

Not sure which of the two fits you? Read our side-by-side comparison of minoxidil vs. finasteride.

Other medical options

Oral spironolactone or dutasteride, prescribed by a doctor for some people.
Low-level laser therapy devices, approved by the FDA, though long-term data are limited.
Hair transplant surgery for permanent pattern hair loss. It is usually not covered by insurance; see our guide to hair transplant costs.

All of these treatments need ongoing use: if you stop minoxidil or finasteride, the hair you gained is usually lost again over the following months.

Everyday habits that protect your hair

Go easy on styling. Avoid tight ponytails, braids and rollers that pull on the roots.
Limit heat and harsh treatments. Hot tools, perms and bleaching weaken the hair shaft.
Eat a balanced diet. Very low-calorie diets and low iron or protein intake can trigger shedding. Read our guide to essential vitamins and minerals.
Manage stress and sleep. Major stress can push many hairs into the shedding phase at once.
Protect your scalp from strong sun with a hat.

What about supplements and “miracle” shampoos?

Be cautious with products promising dramatic regrowth. Supplements like biotin only help if you are actually deficient, which is uncommon. Our look at biotin for hair growth reviews what the evidence shows. Shampoos can make hair look fuller but do not treat pattern hair loss. If a product sounds too good to be true, check with a dermatologist before spending money on it.

When to see a doctor

See a doctor if your hair loss is sudden or patchy, if you lose more hair than usual when combing or washing, if it is causing you distress, or if a woman notices her hairline receding. Early treatment usually works better (Mayo Clinic).

Frequently asked questions

Can thinning hair grow back?

Often, yes. Shedding caused by stress or illness usually recovers on its own, and treatments like minoxidil can regrow some hair in pattern hair loss when started early.

How long does minoxidil take to work?

Plan on at least six months of daily use before judging results.

Is thinning hair in women different from men?

Yes. Women usually notice a wider part and overall thinning on top, while men tend to lose hair at the temples and crown. Treatment options also differ, so a proper diagnosis helps. Our guide to female hair loss causes and treatments covers the options for women in detail.

Do hair loss shampoos work?

They can improve how hair looks and feels, but they do not stop hereditary hair loss on their own.

Sources

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