Hair loss must first distinguish the types. Generally speaking, hair loss can be divided into two basic types: permanent hair loss caused by hair follicle injury and temporary hair loss caused by short-term hair follicle injury. Permanent alopecia is a common male alopecia. In some European countries, the male baldness rate is as high as 40%.

The process of permanent alopecia (male alopecia) is gradually produced. At the beginning, the hair margin of the head and forehead was obviously retracted, and the hair on the top of the head was scarce; Then it will develop gradually, and finally it will develop into only a circle of sparse hair on the back of the head and on both sides of the head. There are three main reasons: genetic factors, lack or disorder of androgen in blood circulation; Overweight. In addition, scars left by various skin diseases or skin injuries, congenital hair dysplasia, serious hair follicle damage caused by chemical substances or physical reasons, etc., may all cause permanent hair loss.

Temporary hair loss is often caused by diseases with high fever. However, X-rays, ingestion of metals (such as thallium, tin and arsenic) or drugs, malnutrition, some skin diseases with inflammation, chronic wasting diseases and endocrine disorders can also lead to temporary hair loss.

There are two ways to treat male pattern alopecia. The first type is hair transplantation, that is, the hair follicle of the scalp with long hair is transplanted to the place with short hair, that is, from the back of the head to the front. The second method is local application. Minoxidil is often used for external use, which can effectively prevent alopecia caused by various reasons and promote hair regeneration in bald or sparse parts.