I. Is hair loss a disease? Hair loss is not necessarily a disease. Because we normal people lose hair every day, under normal circumstances, each person sheds 60-80 hairs per day, and often more when combing and washing hair. When a person sheds more than 100 hairs per day, and continues for more than 2-3 months, or bald spots, hair breakage, progressive hair thinning, thinning of the hair on the top of the head and scalp exposure is obviously a disease, called alopecia or baldness. Second, what are the causes of alopecia areata? 1, genetic factors: If parents suffer from alopecia, their children have a greater chance of suffering from alopecia than the general population. 2, mental factors: mental tension, depression, fear, etc. can lead to human phytoconstriction, capillaries continue to be in a state of contraction, hair follicles do not get the corresponding blood supply, and eventually lead to hair loss. 3, endocrine abnormalities: is caused by endocrine diseases or endocrine dysfunction caused by hair loss. For example: diabetes, thyroid function abnormalities. 4, physical and chemical factors: hair pulling, local friction stimulation, burns, pulling and other physical factors and chemical factors such as hair dyes and perms can also cause hair loss. 5, infection factors: head bacteria, fungi, parasites and viral infections can cause hair loss or scarring after healing so that local hair can not grow, such as bacterial folliculitis, head herpes zoster, syphilis, and a variety of fungi caused by ringworm may cause hair loss. 6, autoimmune factors: hair loss caused by autoimmune diseases such as lupus erythematosus, etc. 7, drug factors: anti-cancer radiotherapy drugs, thallium agents, gentamicin, anti-inflammatory pain and other drugs can make the hair of the growth period prematurely into the resting phase and fall out. 8, nutritional metabolic disorders: excessive sugar, salt, protein deficiency, iron deficiency, zinc deficiency, anemia, malnutrition, etc. can cause hair loss. Third, what are the types of hair loss? There are many types of alopecia, and clinically they are generally divided into ten types: male pattern baldness, female pattern baldness, patchy baldness, endocrine physiological or abnormal alopecia, scarring baldness, hair pulling (hair) mania, abnormal hair structure alopecia, resting alopecia, growth phase alopecia, and congenital alopecia. The most common types are alopecia areata and androgenetic alopecia. IV. What is patchy baldness? It is a sudden, limited hair loss with normal scalp skin appearance and no self-perceived symptoms. The cause of the disease is not fully understood, and many people believe that it may be related to excessive mental stress and physical exertion. The disease is currently considered to be an autoimmune disease mediated by T-lymphocytes targeting the hair follicle tissue. There may be a relationship with genetics. In mild cases, one or several patches of baldness is called baldness, while in severe cases, all the hair may fall out and other parts of the body, such as eyebrows, eyelashes and beard, may fall out. Heavy baldness is more difficult to treat than light baldness, and the course of treatment is longer and less effective. V. What is androgenetic alopecia? Androgenetic alopecia, formerly known as seborrheic alopecia and early baldness, is the most common type of hair loss in clinical practice. It can develop in both men and women, and is mostly seen in men. It is an autosomal dominant disorder. The clinical manifestations are: starting from the sideburns on both sides, the hair becomes thin, sparse and gradually falls out, and the baldness gradually extends inward; after several years to decades, the hair on the forehead and the top can be completely lost, the skin is smooth and shiny, the hair follicles are shrunken or only a small amount of fine hair remains, and the occipital and two frontal parts still retain normal hair; a few begin to lose hair from the top of the head. Women generally lose their hair about 10 years later than men, showing thinning hair on the top of the head, but the hairline of the forehead does not move back. Six, hair loss patients should pay attention to what aspects? 1, keep a relaxed mood and happy spirit. Patients should face life positively, take the initiative to adapt to the fast-paced living environment, and treat life, work and study pressure correctly. Do not mope about hair loss, to establish confidence in curing the disease. 2, to a reasonable diet. Do not consume too much sugar, salt food and animal food, especially greasy food. Because animal and greasy foods provide the conditions for the body to synthesize excessive androgens. The androgen secretion is too much, which can prompt the sebaceous glands to secrete a lot, which can cause seborrheic dermatitis. The actual fact is that you should have a good deal more than just a couple of days. 3, control the number of times you wash your hair. Generally 2-3 times a week. Especially for patients with seborrheic alopecia, the accumulation of sebum on the scalp can form a feedback to sebum secretion, thus slowing down its secretion rate. If you wash your hair frequently, along with the stimulation of detergents, to a certain extent it can cause or aggravate hair loss. Also choose a shampoo with good washing effect and little irritation, and do not use inferior products. It is best not to perm and dye your hair. 4, the head skin disease to actively treat. To go to the dermatologist in a timely manner, ask the dermatologist to give the correct diagnosis, symptomatic treatment. 5, to have patience. Hair growth is a slow process, and it usually takes 3 to 6 months or longer to cure. Therefore, patients must cooperate with the doctor’s treatment and be persistent in order to achieve satisfactory results. 6. Because hair loss affects the image, some people often wear a hat, but long-term wearing a hat may make the scalp blood vessels are compressed and the blood supply and oxygen supply to the hair is affected, aggravating hair loss and reducing hair regeneration.