Perming, coloring and hairdressing can cause hair to become brittle and dry, and even cause irreversible damage. In addition, hair changes also directly reflect the body’s internal health. 1, anemia: lack of iron can lead to anemia, the red blood cells therefore reduce the scalp to get the amount of blood oxygen also decreased, the hair follicles are in a “hungry” state, ultimately leading to the hair slowly fall out, the scalp is increasingly visible. It is recommended to drink fruit juice and eat foods rich in iron to restore hair growth. 2, eating disorders: reduce food intake, will lead to a decline in blood flow to the scalp, which in turn affects the normal growth of hair, and in severe cases will lead to loss of luster or even hair loss. Experts say that hair loss is seldom permanent, but maintaining a balanced diet and consuming more protein is very crucial to preventing hair loss. 3, polycystic ovary syndrome: women with polycystic ovary syndrome is due to high androgen, the patient’s forehead and the top of the head will occur hair thinning symptoms. This condition occurs mostly in patients with a family history of hair loss. Drugs to reduce androgens and scalp massage to promote blood flow can help patients’ hair grow back. 4, thyroid disease: The first symptom of thyroid dysfunction is hair loss. Experts say that medications and other treatments help to alleviate the condition. In order to get your hair back, it is best to consume more protein and do a head massage every morning. 5, stress syndrome: Stress can lead to premature hair growth. Stress when the body releases a variety of hormones will affect the absorption of B vitamins, affecting hair pigmentation. Stress syndrome can lead to baldness human immune system error attack scalp cells, resulting in large swaths of hair loss. Mental relaxation and taking vitamin B complex can improve the problem of premature gray hair.