It is difficult to grow back hair when it is bald. Hair baldness is mostly seen in androgenetic alopecia, and it is usually difficult to grow hair back after baldness has already occurred. Androgenetic alopecia has a certain genetic tendency, and it mostly develops around the age of 20-30. Hair loss starts from the forehead and temporal area, and the hairline will gradually move back. As we age, hair starts to fall out and thin at the top of the skull. If it has reached the level of baldness, it is already very serious and even if treatment is carried out in time, it will not be possible to make the hair grow back. However, if the patient is particularly concerned, he or she can go to a dermatologist for hair implants to regrow hair on the top of the head, or choose to wear a wig. Also, baldness needs to be treated medically with oral anti-androgen medication and topical application of 2%-5% minoxidil application to avoid continued hair loss. People with baldness need to pay attention to sleep, mental relaxation, work and rest, more fresh fruits and vegetables, and hair care.