There are many friends hair fall very bad, so what is the cause of hair fall is very bad? The following to introduce you to the reasons for the hair fall is very strong. What is the reason for the great hair fall, there are roughly the following situations: 1, endocrine disorders. Hair loss is related to the increase of androgens in the human body. Another scholar found that patients suffering from thyroid disease combined with a lot of hair loss, and thus that hair loss is related to thyroxine. 2, mental and nervous disorders. Some young people suffer heavy blows, or long-term mental tension, depression and produce hair loss. 3.Heredity. Alopecia areata patients with family history accounted for 20%. In heredity, it is dominant for men and recessive for women, which is one of the reasons why there are more men than women with hair loss. 4. Immune dysfunction. Clinically, it is found that people with immune system disorders such as lupus erythematosus and ulcerative colitis are often accompanied by hair loss. 5, lesion infection. Due to fungal, bacterial and viral infections can lead to local blood clots or small vasculitis, and its dominant range of hair, due to the blood supply is impaired and produce hair loss, hair loss is what causes the answer slowly unravel. 6, improper diet and fat metabolism disorders. Some young men excessively like to eat meat, alcohol, when the body produces a lot of cholesterol can make too much sebum, which affects the blood supply of the hair follicle. Impede the normal growth of hair and cause hair loss. 7, blood deficiency and kidney deficiency. Chinese medicine believes that hair loss is the result of blood deficiency and kidney deficiency. 8, hair damage. Foreign experts have pointed out after investigation, long-term use of hair dyes, hair loss can occur in 2 to 20 years. In addition, the frequent use of hair dryers, pliers, electric heaters perm, will also cause hair loss. What are the types of hair loss? 1, neurological hair loss: hair loss often occurs when mental stress is too much. In the role of mental stress, the human body hair muscle contraction, hair erect, the plant nerve or central nervous function of Xu disorder, hair follicles hair papillae change and malnutrition, resulting in hair hair growth function method oh inhibition, hair into the resting phase and hair loss. 2, infectious hair loss: various pathogens of infection is a major factor in hair disease, mainly including bacteria, viruses, fungi, spirochetes, parasites and other infections. 3, symptomatic hair loss: certain systemic or local diseases can be accompanied by hair loss. 4, immune hair loss: some autoimmune diseases or immunodeficiency diseases can appear hair loss, and some are local immune diseases that occur in the hair and do not involve other tissues of the group. 5, endocrine hair loss: hair growth is affected by a variety of endocrine hormones, so when the occurrence of endocrine abnormalities cause hair loss disease, the most common is to hair disease and androgenic hair loss. 6, seasonal hair loss: generally easy to lose hair in summer, because the summer temperature is high pore expansion leads to hair loss, autumn and winter is not easy to lose hair, because this period the temperature drops pore closure is not easy to lose hair.