Approximately 65% of people undergoing chemotherapy will experience hair loss. Chemotherapy targets all rapidly dividing cells — including hair follicles, which are among the fastest-growing cells in the body.
Hair loss typically begins two to four weeks after starting treatment. It may happen gradually or quickly, in clumps or patches. You may notice it on your pillow, in your brush, or in the shower drain. Hair loss is not limited to the scalp — eyebrows, eyelashes, and body hair can also be affected.
The good news: for most people, hair loss from chemotherapy is temporary. Hair usually begins returning about 12 months after treatment ends, and almost everyone sees full regrowth within five years.