Cancer patients are generally allowed to dye their hair after their condition has recovered for half a year, but it is not clinically recommended to dye their hair, as the chemical components in some hair dyes are harmful to the body and are not conducive to the recovery of their condition. Cancer patients can dye their hair after their condition has been stable for more than half a year, but many hair dyes contain lead, benzene, phenol, naphthalene and other chemical ingredients that may be harmful to the body. Moreover, cancer patients undergoing chemotherapy may suffer from alopecia and hair loss, and their scalp itself is damaged, and dyeing their hair may aggravate the burden on the scalp, so although dyeing the hair of cancer patients is not a contraindication, dyeing the hair of cancer patients is not clinically recommended. They should maintain a healthy lifestyle in daily life, have a reasonable and balanced diet, exercise appropriately, improve immunity, and undergo regular checkups to reduce tumor recurrence and metastasis.