It is best to seek medical attention promptly to rule out endocrine system disorders, such as abnormal blood sugar and thyroid function, as well as stress, anxiety or stressful trauma that can cause hair loss in large patches. Some connective tissue diseases, such as lupus erythematosus, can also cause hair loss, and some chemotherapy drugs or immunosuppressants can also cause hair loss in patches. It is recommended to actively look for the cause to give correction, avoid tension, anxiety and restlessness, and ensure quality sleep. Do not lose weight excessively, dieting, which may lead to hair loss in pieces, you can take oral cystine tablets to nourish your hair.