Whether hair will grow back after hair loss needs to be judged according to the specific condition of the patient. If the hair loss is caused by normal metabolism or mental stress, etc., new hair will grow back, while if it is caused by bacterial or other infections, new hair may not grow back. If the patient has normal hair loss caused by metabolism, he/she can usually grow new hair because metabolism is a normal physiological phenomenon, so he/she can grow new hair again. If the patient’s daily work or study stress is high, it can also lead to baldness or resting hair loss, and the patient can grow new hair after self-regulation. In addition, if the hair loss is caused by bacterial or fungal infection, the hair follicles may be destroyed and scars may form, resulting in permanent hair loss, in which case the hair may not grow back. Hair loss can be caused by a variety of factors, and it is recommended that patients who experience symptoms of hair loss go to the hospital in a timely manner and follow the doctor’s instructions for treatment.