1. Excessive mental stress: Mental stress stimulates the brain greatly, sometimes affecting the supply and growth of hair nutrition. All activities of the human body belong to the brain tube. When the brain is stimulated, its activities will be disordered and it will not work normally. It is bound to stimulate the body's nutrition and lead to hair loss. At the same time, be sure to keep a good sleep.

2. Qi and blood: the growth of hair needs nutrition, and nutrition is transported by blood. If a person is ill for a long time, his blood gas is weak and his body is poorly nourished, his hair will temporarily fall off because of insufficient nutrition and poor growth.

3. Hair dyeing and hairdressing. I won't say much about this. Everyone knows that.

4. Diet: Pay attention to diet nutrition, often eat foods rich in protein and trace elements, eat more vegetables and fruits, and eat less greasy and sugary foods. Remember to drink, smoke, fry, spicy and other stimulating foods.

5. Ultraviolet rays: If people are exposed to the sun for a long time, it will also cause damage to the scalp, because the scalp is not nourished and the water loses too quickly. If you blow the air conditioner for a long time, it will also cause hair loss because of the warm and humid air and cold air of the air conditioner. Too dry or too humid air is not conducive to protecting hair.

6. illness: the liver is full of fire. Kidney is not good. Low immunity. Endocrine disorder. Can cause hair loss and alopecia.

7. Excessive use of shampoo containing silicone oil will block scalp hair follicles, and the scalp is airtight, leading to hair loss.