As the saying goes, nine out of ten smart people are bald, and many times people think that overuse of the brain will lead to hair loss and end up bald, in fact, there is no direct causal relationship between hair loss and overuse of the brain. Why do people lose their hair? Eventually became bald! 1, the culprit – androgenetic alopecia This is a hereditary factor, and most of the people who suffer from this problem are men. Androgenetic alopecia used to be called seborrheic alopecia. The sebaceous glands and hair follicles on the scalp are sensitive to androgens. Under the action of androgens, the sebaceous glands secrete exuberantly and the secretion of oil from the scalp increases; at the same time, the hair follicles shrink and become smaller, and the hair that grows out becomes thinner, shorter, and prone to fall out until the hair follicles go on strike completely. In the process of androgen-induced early retirement of hair follicles, the forehead, the top of the head and the upper part of the back of the head of the hair follicles in particular, thus causing the occurrence of baldness. 2, some people carry the “hair loss gene” Some men carry the “hair loss gene”, which makes their hair follicles more sensitive to androgens, so about a quarter of Chinese men will gradually go bald after entering middle age. (Eyebrows on the other hand, Chinese men will gradually grow in middle age.) This proportion is even higher in European men, more than half of the men are carrying the gene for hair loss, and the fate of baldness is waiting for them. 3. Androgenetic alopecia can occur in women too! Androgen levels are lower in women, so the chances of androgenetic alopecia are much lower than in men, but androgenetic alopecia is still one of the main causes of female hair loss. Studies on female hair loss show that most women ≤25 years old with hair loss have a family history of androgenetic alopecia and have lower than average estrogen levels, suggesting that androgens are the most important factor contributing to hair loss in young women. Are there other reasons? Most of the “baldness” is due to androgens, while other types of hair loss, such as baldness, are often induced by other factors. 1, mental stress: is one of the main culprits of hair loss, especially baldness, long time in nervousness, anxiety, depression, sadness and other emotions, as well as sudden changes, are easy to lead to hair loss, gray hair become more. 2, physiological factors: many physiological factors will also make people lose hair, such as: patients undergoing chemotherapy, because of the impact of chemotherapy drugs, hair loss; hemiplegia and other diseases or major surgery and long-term sedentary patients in bed, the head for a long time pillow in the pillow, easy to lead to occipital (back of the head) bald spots. Including kidney disease, adrenal tumors, hypothyroidism and other endocrine diseases, as well as some autoimmune diseases, including many diseases will lead to hair loss, normal people lose dozens of hair per day, if the hair loss continues for several months every day hundreds of hair, it may suggest the existence of chronic diseases, you should go to the hospital for a comprehensive physical examination. Some health fluctuations that are not easily noticed by people will also be reflected in the hair, for example, lower serum ferritin levels (can be seen as a kind of anemia) will induce hair loss, high blood pressure and high blood fat (especially high cholesterol content) people are also prone to hair loss. After childbirth, the body’s hormone levels change dramatically, there will be a short period of time a large number of hair loss, usually within six months after delivery to return to normal. Situations such as high fever, continuous late nights, dieting and weight loss, which cause a great deal of depletion of the body, will also cause hair to fall out more. These causes of hair loss, once the patient recovers, return to normal life and routine, dietary nutrition is rich and reasonable, hair will slowly grow back. 3, seasonal factors: fall in temperature in the fall and winter seasons, scalp capillary contraction, the hair follicles can not get enough nutrient supply, there may be seasonal hair loss. After the human body adapts to climate change, this hair loss situation will be better. What about gray hair? As with hair loss, the main causes of gray hair in young and middle-aged people are hereditary factors, mental stress factors and health factors, which are not directly related to “overuse of the brain”. 1, on the top of our head, hair follicles in the “melanocytes” will produce melanin, for hair “color” on the black, normal people about 35 years old, the function of melanocytes began to decline, gray hair gradually appeared, and some people in the twenties, and even 2, in addition to genetic factors and mental stress, B vitamins, proteins and certain trace elements such as copper deficiency, tuberculosis, typhoid fever, pernicious anemia and other wasting diseases, pituitary hypoplasia, hyperthyroidism and other endocrine disorders, are leading to an increase in white hair 3, and hair loss, these causes of gray hair, when the primary disease is cured, black hair can grow again. Although “overuse of the brain” is not the cause of hair loss and early gray hair, but long-term fatigue, do not pay attention to relieve psychological stress, will cause a variety of physical problems.