Hair loss during chemotherapy: why hair falls out and when it grows back

Few other side effects change your appearance so visibly while also affecting how you feel in your own body. Yet not every cancer treatment inevitably leads to hair loss. Whether chemotherapy causes hair loss, when it begins, and whether chemotherapy without losing hair is possible depends above all on the specific drugs used, their dosage, and how each person’s body responds.

In this article, you’ll learn why hair can fall out during chemotherapy, when it grows back, and what options you have for coping with this challenging situation.

The key points at a glance

Hair loss during cancer treatment is, for many patients, one of the most emotionally challenging effects of chemotherapy. Here are the key facts at a glance:

• How it works: Chemotherapy drugs specifically target rapidly dividing cells. Because hair follicle cells are among them, hair growth is temporarily halted¹.
• Timing: Hair loss usually begins two to four weeks after the first treatment.
• Not a given: Not every course of chemotherapy leads to complete hair loss; the extent and intensity depend heavily on the drugs used.
• Ways to protect hair: Scalp cooling² can lower the risk in some cases. Talk this over with your oncology team beforehand.
• Regrowth: The hair loss is temporary. After treatment ends, the roots recover, and hair usually grows back.

Why does chemotherapy cause hair loss?

The answer lies in how the treatment works. Many cytotoxic drugs—the medicines used to treat cancer—inhibit cell division or stop cells from multiplying further. Because cancer cells grow especially fast, this is a way to target them directly. But the drugs cannot fully tell tumor cells apart from other fast-growing cells. As a result, they can also affect healthy tissue whose cells renew regularly—such as the mucous membranes, the bone marrow, and the hair follicles. This is exactly why chemotherapy can cause hair loss³.

The hair root—a small high-performance organ

Even though we usually think of hair as just part of our appearance, a remarkably complex biological process lies behind its growth. Each individual hair forms in a hair follicle, a small, tube-shaped structure in the scalp that produces and nourishes the hair.

The hair matrix sits in the lower part of the follicle. There, cells divide almost continuously and produce new hair material. In fact, these cells are among the most active in the human body. As long as a hair is in its growth phase, it grows an average of 0.3 to 0.4 millimeters per day.

The hair cycle explained

For hair to grow, it moves through a natural cycle of several phases:

• Anagen phase (growth phase): Roughly 85% to 90% of all scalp hairs are in this active phase at any given time.
• Catagen phase (transition phase): Cell division slows, hair growth stops, and the follicle begins to shrink back. This phase lasts only a few weeks.
• Telogen phase (resting phase): The hair stays in the scalp for a few more months before it falls out and makes room for a new hair.

Under normal conditions, these phases stay in a balanced equilibrium. That’s why people lose about 50 to 100 hairs a day without even noticing.

Chemotherapy mainly attacks cells that divide quickly. Because most hair follicles are in the anagen phase, they are especially sensitive to these drugs. Cell division in the hair matrix is disrupted or comes to a temporary standstill. The hair is then no longer sufficiently nourished, loosens in the scalp, and eventually falls out. In medicine, this is known as chemotherapy-induced alopecia (CIA). The term describes the temporary hair loss that results from chemotherapy⁴.

Does the hair loss affect only the hair on your head?

Depending on the type of treatment, eyebrows, eyelashes, and facial, underarm, or body hair can be affected too. Whether this happens, and how severe the hair loss is, depends on the drugs used, the dosage, and individual factors⁵.

Hair loss usually doesn’t happen overnight. Many people first notice more hair than usual coming out when they comb or wash it. Some also report a tender or slightly sore scalp, a feeling of tightness, or itching. These sensations can be early signs that the hair follicles are responding to the chemotherapy. Whether these symptoms appear, and how strongly, varies from person to person and depends on a number of factors.

Preparing for hair loss

How you want to handle the hair loss ahead is a very personal decision. Some people choose a shorter haircut before treatment begins, to make the transition gentler. Others keep their usual hairstyle for as long as possible, look into a wig early on, or make a deliberate choice to go without any head covering. Whatever feels right for you and gives you a sense of security during this time is the right choice.

When does hair grow back after chemo?

In most cases, hair loss from chemo is temporary. Unlike some other types of hair loss, chemotherapy usually does not permanently destroy the hair follicles. Once treatment is complete and the cancer drug is cleared from the body, natural hair growth can begin again. For many people, hair starts to grow back within three to six months⁶. At first it often resembles a soft down. Over time, the hair becomes stronger and thicker. How quickly it grows back varies from person to person and is influenced by factors such as:

• the chemotherapy drugs used,
• the length and intensity of the treatment,
• age,
• overall health,
• genetic factors.

Why does the new hair often feel different?

Many people find that the hair growing back is finer, softer, or curlier than it was before treatment. In everyday language, this is often called “chemo curls”⁷. The reason lies in the temporary recovery of the hair follicles. As the hair root recovers, the structure of the newly formed hair can change. In many cases, hair texture and color return to normal over the following hair cycles.

Can hair growth be supported?

Many people wish they could actively encourage the recovery process. In most cases, though, patience is the most important companion. Hair follicles need time to resume their normal function. Every newly growing hair is a sign that the body is recovering step by step. During this phase, there are a few things you can do to protect the sensitive scalp and create good conditions for recovery and renewed hair growth:

• Focus on a healthy, balanced diet.
• Have any possible nutrient deficiencies—such as iron, zinc, or vitamin D—checked by a doctor before taking any supplements.
• Use mild hair-care products and, in the first few months, avoid high heat from a hair dryer as much as possible.
• Treat the regrowing hair especially gently and avoid unnecessary mechanical stress.

Coping with hair loss during chemo—finding your own way

For many people, losing their hair is far more than an outward change. It makes the illness visible. While some are open about the hair loss, others experience it as a deep blow to their sense of self. Both reactions are understandable, because for many people hair is closely tied to identity, personality, and how they feel about life. That is exactly why there is no “right” way to cope with hair loss during chemotherapy.

Wig, scarves, or no head covering at all?

Whether it’s a wig, a turban, a scarf, or a hat, every decision is the right one. What matters is not how others judge your choice, but what makes you feel secure and comfortable during this particular phase of life. Some people want to keep their familiar appearance for as long as possible; others find that deliberately going without a head covering feels freeing. If you’re interested in a wig, it’s worth seeking advice early. In Germany, health insurers cover the cost of a synthetic-hair wig for women, provided a doctor’s prescription is in place. Your care team or a specialized medical supply store can advise you on this.

Losing eyelashes and eyebrows can also noticeably change the face you see in the mirror. Makeup workshops at cancer centers or cancer counseling services show how to redraw eyebrows naturally and gently define the eye area⁹.

Gently caring for your scalp and regrowing hair

During and after chemotherapy, the scalp can be more sensitive than usual. Many people report a feeling of tightness, dryness, or heightened sensitivity to sun and cold. The following steps can help ease the strain on the scalp¹⁰:

• Treat your hair and scalp as gently as possible, and use mild, skin-friendly shampoos.
• To support your hair follicles, choose products that are dermatologically tested with excellent tolerability, are also microbiome-friendly, and are free from hormones, preservatives, silicones, parabens, alcohol, and fragrances—our 8T3 Essentials Hair Serum meets these criteria and gives your scalp gentle, safe support.
• Protect the scalp from intense sun—for example, with a hat, a scarf, or sunscreen where the skin is exposed.
• In cool temperatures, wear a soft head covering to prevent heat loss.
• Avoid vigorous rubbing after washing, and treat the scalp especially gently overall.
• Use a soft brush once the hair grows back, and steer clear of harsh styling products entirely.
• Massage your scalp regularly.

Psycho-oncology counseling: support for body and mind

Many cancer centers and oncology practices offer psycho-oncology counseling. Psycho-oncologists are specially trained to support people with cancer and their loved ones through this exceptionally difficult time¹¹. These conversations are not about “having to think positively.” Instead, they give patients room to talk about their worries, fears, and questions. Together, you can develop strategies for coping better with the physical and emotional changes the illness brings. That includes dealing with hair loss..

Psycho-oncology support can help you:

• make sense of fears and uncertainties,
• come to terms with a changed body image,
• talk more easily with loved ones,
• and find new strength for everyday life.

Accepting help is not a sign of weakness. Don’t hesitate to ask your care team about the options available. Psycho-oncology support is now a firmly established part of modern cancer care and can be used from the moment of diagnosis onward.

In summary: hair loss during chemo is usually only a temporary phase

For many people, hair loss during chemo is one of the most visible and emotionally difficult effects of cancer treatment. Even though the hair loss often cannot be prevented, it is temporary in most cases. Knowing why hair falls out, what the typical course looks like, and when it usually grows back can help you make sense of this time. Just as important is accepting support—whether from your medical team, from support groups, from psycho-oncology counseling, or from the people around you. Above all, though: everyone experiences cancer differently. There is no right or wrong way to deal with hair loss. What matters is finding your own way and giving yourself the time your body and mind need to recover.

Frequently asked questions about hair loss during chemotherapy

Sources:

¹ https://www.krebsinformationsdienst.de/nebenwirkungen-bei-krebs/haarausfall

² https://www.aerzteblatt.de/archiv/chemotherapiebedingte-alopezie-kuehlen-der-kopfhaut-kann-haarverlust-vermindern-1866018a-7fd3-4ed9-8687-46c551cd2ad3

³ https://www.cancer.gov/about-cancer/treatment/side-effects/hair-loss

⁴ https://www.dkv.com/gesundheit-themenwelt-onkologie-haarausfall-bei-der-krebstherapie.html

⁵ https://mammamia-online.de/brustkrebs/behandlung/haarausfall-bei-chemotherapie/

⁶ https://www.krebsinformationsdienst.de/fileadmin/pdf-dateien/informationsblaetter/iblatt-haarausfall.pdf?m=1656324583&⁷ https://www.krebsinformationsdienst.de/nebenwirkungen-bei-krebs/haarausfall

⁸ https://www.gelbe-liste.de/onkologie/nahrungsergaenzungsmittel-therapieresistenz-krebs

⁹ https://www.onko-portal.de/basis-informationen-krebs/leben-mit-krebs/pflege-und-schoenheitstipps-fuer-krebspatienten/haarverlust-bei-kr.html

¹⁰ https://www.krebshilfe.de/informieren/ueber-krebs/mit-krebs-leben/#c21054

¹¹ https://www.krebsinformationsdienst.de/psychoonkologie-praxen