Hair after chemotherapy: why it falls out, how it grows back and how to cope

Why chemotherapy affects the hair

Chemotherapy is designed to act on cells that divide rapidly, as cancer cells do. Some healthy cells also divide quickly, including the cells of the hair follicle that produce the hair. When these cells are affected, the hair becomes weak and falls out. This is known as chemotherapy-induced hair loss.

Hair goes through cycles of growth and rest, and most scalp hairs are in the active growth phase at any time. Many chemotherapy drugs act most strongly on follicles in this phase, which is why shedding can be sudden and widespread. Hair loss often begins a few weeks after the start of treatment and may also affect the eyebrows, eyelashes and body hair.

Why the experience differs from person to person

How much hair is lost depends on many factors: the specific drugs, their dose and schedule, other treatments given at the same time and individual differences. Some medicines cause only mild thinning, while others lead to complete hair loss. Not every cancer treatment causes hair loss at all.

Your oncology team knows which drugs you will receive and can tell you what to expect. Asking this question before treatment starts helps many people prepare, for example by choosing a shorter haircut, a wig or a head covering in advance.

What may reduce hair loss during treatment

It is not always possible to prevent hair loss, but some approaches may reduce it or make it easier to manage. All of them should be discussed with the oncology team, because not every option suits every type of cancer or treatment.

Scalp cooling

Scalp cooling uses a cold cap or cooling system during chemotherapy infusions. Cooling narrows blood vessels in the scalp, so less of the drug may reach the follicles. It can reduce hair loss for some people with some treatments, but it does not work for everyone, it is not suitable for all cancers or drug regimens, and it can be uncomfortable. Whether it is appropriate is a decision for your oncologist.

Gentle hair care

• use a mild shampoo and lukewarm water;
• brush gently with a soft brush and avoid tight hairstyles;
• limit hair dryers, straighteners and other heat styling;
• avoid colouring, perms and other harsh chemical treatments during and shortly after chemotherapy;
• protect the scalp from sun and cold with a hat or scarf, and use sunscreen on exposed skin as advised.

Nutrition

A balanced diet with enough protein, iron, zinc and B vitamins supports general health, including the hair. However, supplements can interact with cancer treatment. Do not start any supplement or change your diet significantly without first talking to your oncologist.

How hair grows back after treatment

For most people, chemotherapy-induced hair loss is temporary. Hair usually starts to grow back within a few weeks to a few months after the last treatment. At first it may be very fine and soft, and it gradually becomes thicker.

The new hair may differ from the old: it can be curlier or straighter, a different colour or texture. In many people these changes are temporary, and over the following months the hair often becomes more like it was before, although sometimes differences remain.

During regrowth, continue gentle care. Avoid chemical treatments until your hair and scalp have recovered and your doctor agrees. Some people like to keep the hair short while it evens out.

When to ask a doctor

In a small number of people hair grows back more thinly than before or does not return fully in some areas, and some hormonal therapies used after chemotherapy can also cause thinning. If regrowth seems very slow, patchy or absent many months after treatment has ended, raise it with your oncology team. They may refer you to a dermatologist to look for the cause, which can include treatable factors such as thyroid problems or low iron.

Emotional support

Hair loss can affect self-esteem, privacy and how people feel about going out. These feelings are common and valid. Talking to a psychologist, joining a support group or speaking with people who have been through the same experience can help. Many hospitals and cancer charities offer advice on wigs, head coverings and make-up for eyebrows and eyelashes.

It may help to remember that hair loss does not reflect your strength or the success of your treatment. It is a side effect, and for most people it passes.

Working with your medical team

Each patient is different, and what helps one person may not suit another. Keep an open line with your oncologist and nurses: ask about the expected effect of your drugs on the hair, whether scalp cooling is an option, which products are safe to use and when you can return to colouring or styling. Any decision about procedures on the scalp during or after cancer treatment should be made together with your oncologist.

Consultation at City Medical Centre

Hair usually recovers on its own after chemotherapy, and in most cases no procedure is needed. A hair transplant is not a treatment for chemotherapy-induced hair loss. It may be discussed only in specific situations, for example when hair has not grown back in some areas long after treatment has ended, or when pattern hair loss unrelated to chemotherapy is present, and only after your oncologist confirms that it is safe. City Medical Centre works with international patients, and the first consultation is free and can be held online. If your oncologist agrees, you can send photos and questions by WhatsApp, and the doctor will explain whether a transplant is appropriate at all; the cost is discussed only after that assessment and fixed in the contract, and a personal coordinator stays with you throughout. You can read about the procedure on the hair transplant page.

Frequently asked questions

Will my hair grow back after chemotherapy?

For most people, yes. Hair usually starts to grow back within a few weeks to a few months after the last treatment. It may be finer, curlier or a different colour at first, and often becomes more like it was before over the following months.

Does scalp cooling prevent hair loss?

It can reduce hair loss for some people with some chemotherapy regimens, but it does not work for everyone and is not suitable for every type of cancer or treatment. Whether you can use it is a decision for your oncologist.

Can I colour my hair when it starts growing back?

It is usually advised to wait until the new hair and scalp have recovered, because the scalp can be sensitive and the hair fragile. Ask your oncology team when it is safe, and choose gentle products when you start again.

What if my hair does not grow back properly?

If regrowth is very slow, patchy or absent many months after treatment has ended, tell your oncology team. They may refer you to a dermatologist to look for the cause, which can include treatable factors. Any procedure should be discussed with your oncologist first.

Is a hair transplant used after chemotherapy?

Rarely. Hair usually regrows by itself, so a transplant is not a standard part of recovery. It may be discussed only if some areas have not recovered long after treatment, or for unrelated pattern hair loss, and only with your oncologist's agreement.