There are many blood vessels, nerves, sebaceous glands, sweat glands and hair follicles distributed on the scalp, and the scalp can provide the required nutrients for the hair. A healthy scalp usually has the following conditions: 1. no obvious dandruff: dandruff is the most intuitive manifestation of scalp health, if there is a lot of dandruff, it is usually an increase in keratin caused by fungal infection, and antifungal treatment is needed; 2. relaxed but not tight scalp: there is no tightness in the scalp, and pressing on the scalp No obvious sensitive irritation; 3, no itching: scalp itching may be excessive oil secretion, or pathogenic bacteria infection, in either case need to keep the scalp hygiene clean; 4, long time to keep fresh: healthy scalp can be kept fresh for a long time. The outer layer of the scalp has a sebaceous film and normal beneficial bacteria to form a natural defense barrier. Once the scalp is sick, it is easy to be infected with bacteria and fungi, which hinders the healthy growth of hair. Therefore, it is recommended to get enough sleep, keep a happy mood, do not have too much mental stress, eat less greasy and spicy food, eat more vegetables and fruits, usually use milder shampoos, massage with fingertips appropriately when washing hair, and actively go to a professional hospital for treatment if you have hair loss symptoms.