Cool Does Hair Grow Back After Radiation 2023. You may start to see your hair thin or fall out 1 to 4 weeks after your first chemotherapy treatment and 4 weeks after you receive radiation therapy. Hair may grow back once therapy is finished.

A major determinant is whether or not the scalp damage caused by radiation heals with scar / fibrous tissue formation. Web the most common early side effects are fatigue (feeling tired) and skin changes. Web “the hair normally starts growing back within a few months after the radiation therapy is completed, but in some cases, hair follicles suffer permanent damage,” said dr.