There are many main causes of hair loss. Bad living habits, great mental stress and unhealthy diet will all lead to hair loss, and there are two kinds of hair loss:

1. Hair follicles at the hair loss site are in a state of temporary dormancy. Generally, this kind of hair loss is due to the lack of nutrients in hair, which belongs to nutritional hair loss. This kind of hair loss will grow hair again through diet or medicine supplement.

2. Hair follicle necrosis at the hair loss site. Many people will not grow hair again after losing their hair, because the hair follicle at the hair loss site is necrotic and the hair has no roots. The effective method for this phenomenon is hair transplantation, but the hair follicle necrosis at the hair loss site is invisible to the naked eye, and it is necessary to go to a regular hospital for hair follicle testing before further treatment can be taken.