Wake up early in the morning, the pillow, bed, floor, broom are flicked full of hair. Oh no, hair will fall out? Don’t worry, hair also has a metabolism, daily hair loss dozens, or even hundreds of hair, are normal. Only if you lose hundreds of hair per day for more than three months, then beware of pathological hair loss. First, how to self-test hair? 3-5 days without shampooing, grab 50 hairs with your thumb, index finger and middle finger, gently stroke, if you lose 2 hairs or less, it is normal; if up to 6 hairs or more, there may be a tendency of hair loss. Second, what are the causes of hair loss? 1, androgenic alopecia: also known as seborrheic alopecia, is related to high androgen levels or hair follicles are overly sensitive to androgens, and has a family tendency. 2, drug alopecia: such as immunosuppressants, chemical drugs, contraceptives, arsenic preparations, retinoids, etc. 3, malnutrition alopecia: mostly occurs in long-term weight loss, paranoid people. 4, infectious alopecia: there are penetrating folliculitis, ringworm, pustular ringworm, syphilis, etc.. In addition to syphilis, other infectious alopecia are irreversible permanent hair loss. 5, baldness: commonly known as “ghost shaving”, related to autoimmunity, usually occurs in the case of long-term late night, mental tension or depression, smoking and drinking habits. 6.Postpartum alopecia: it is related to the changes in endocrine level during pregnancy and postpartum, and usually recovers on its own in about two years. 7, secondary hair loss: can be secondary to anemia, acute hyperthermia, hyperthyroidism or hypothyroidism, chronic wasting disease, etc., active treatment of the original disease, hair loss will gradually improve. Third, how to care for hair? 1, use a round-headed wooden comb to comb the hair, to prevent static electricity damage; tie the hair not too tight, to avoid pulling hair loss. 2, warm water shampoo, avoid strong alkaline shampoo, with conditioner, shampoo with a small amount of vinegar, salt, beer, as appropriate, to help prevent hair loss. 3, sun protection, diversification of dietary structure, eat more red meat, fish, carrots, nuts, drink milk, maintain sufficient sleep, optimism, all help hair quality improvement. 4, avoid long-term use of computers, cell phones, quit smoking and alcohol.