When to see a doctor about hair loss

Signs that need a doctor soon

Slow thinning over years is usually pattern hair loss, and you can read about it and the options without rushing to a clinic. Some signs are different. Book an appointment with a doctor or dermatologist if you notice any of these:

Round or oval bald patches, especially smooth ones, or patches in your beard or eyebrows.
A red, scaly, sore, itchy or burning scalp, or small bumps and crusts around the hairs.
Shiny skin where hair used to be, with no visible openings for hairs. Some rarer conditions leave scars, and the hair cannot grow back once that happens. Early treatment matters.
Hair loss that is fast, for example handfuls a day for weeks, or a clear change within a month or two.
Hair loss with other symptoms, such as tiredness, feeling cold, weight change, irregular periods, acne or new hair on the face or body.
Hair loss in a child.
Hair loss that started after a new medicine. Do not stop a prescribed medicine on your own; ask the doctor who prescribed it.

If none of these fit, you have time. Still, a doctor can confirm what kind of hair loss you have, and that is worth knowing before you spend money on treatment.

Which doctor to see

In most of Europe, your general practitioner (GP) is the place to start. They can take your history, look at your scalp, order blood tests, and refer you to a dermatologist if needed. In some countries you can book a dermatologist directly, and some dermatologists have a special interest in hair.

Trichologists are hair and scalp specialists, but in most countries they are not medical doctors and cannot prescribe or order every test. They can be useful for scalp care and advice. For a diagnosis or a prescription, you need a doctor.

What happens at the appointment

A first visit is usually simple. Expect three parts.

Questions. When did it start? Is it shedding all over, thinning in one area, or patches? Has anything happened in the past few months, such as an illness, a fever, giving birth, an operation, a crash diet or a hard time? Shedding that starts after a shock often begins two to four months later, so the doctor will ask about events that far back.^4,2 They will also ask about medicines, periods, family history and your diet.

A look at your scalp. The doctor will look at where the hair is thin and at the skin. Many use a small magnifier, called a dermatoscope, to look at individual hairs. Fine, short hairs mixed with normal ones point to pattern hair loss. Some patterns point to other conditions.

Sometimes a pull test. The doctor holds a small bunch of hairs and pulls gently. If many come out easily, it suggests active shedding.

Bring a list of what you have already tried, including shampoos and supplements, and any photos that show how your hair has changed.

Blood tests worth asking about

There is no single "hair loss blood test". Doctors choose tests based on what they see and what you tell them. These are the ones that come up most often:

Blood count and ferritin. A blood count checks for anaemia. Ferritin shows how much iron your body has stored, and it is the usual test to confirm iron deficiency.¹ Ferritin can read falsely high during an infection or inflammation, so doctors sometimes add other iron tests.
Thyroid tests. Both an underactive and an overactive thyroid can cause shedding, so thyroid tests are common when hair loss is diffuse.²
Hormone tests, for women with irregular periods, acne or new facial hair. These can point to conditions such as polycystic ovary syndrome (PCOS). Read more in hair loss in women.
Vitamin D, sometimes. Low levels are common in people with hair loss, but there is no proof that taking vitamin D corrects it.⁵

Iron is a good example of why testing beats guessing. Doctors treat anaemia from iron deficiency. But there is not enough evidence to recommend iron tablets for people with hair loss who are not deficient, and too much iron can harm you.¹ So a test first, then a decision. You can read more in our guide to supplements.

What happens next

Most people leave the first visit with one of three outcomes.

A clear diagnosis. For pattern hair loss, the doctor may suggest minoxidil, finasteride or other options. Our guides explain each one: minoxidil, finasteride and the options side by side.
A cause to fix first. If a blood test finds low iron or a thyroid problem, treating that comes first. Shedding often settles over the following months, but hair grows slowly, so improvement takes time.⁴
A referral. Patches, scalp inflammation, or anything unclear may need a dermatologist, and sometimes a small skin sample (biopsy) to be sure.

Whatever the outcome, ask the doctor when you should come back and what would count as a reason to come back sooner. Take a set of progress photos on the day, so you can both compare later.