Chemotherapy usually starts hair loss in the 2nd-3rd time, but there are a few people who experience hair loss after the 1st chemotherapy treatment. 1. Hair loss caused by chemotherapy is mainly due to the fact that chemotherapy drugs act on the normal hair follicle cells of the body, resulting in damage to the normal cells and causing hair loss. Generally speaking, hair loss will gradually start after 2 times, and the more times, the more obvious hair loss. 2. The degree of hair loss is related to the type of drug and its dosage. Generally speaking, the higher the dose and the more treatments, the more serious the hair loss. Don’t worry too much, hair loss caused by chemotherapy is usually reversible. Hair will start to grow again about 1 month after all chemotherapy is finished. 3. During this period, you do not need to be under too much psychological pressure, you can wear a wig cover, and if necessary, you can contact a dermatologist for consultation and treatment.