Hair is the fastest growing hair, which can grow about 0.3 mm a day and night, which is related to many factors such as race, age, nutrition, healthy mood, season and so on. For example, it is hot every day in summer and hair grows fast; It is cold in winter and grows slowly.
Hair won't be infinitely long. Under normal circumstances, when it grows to 50~60cm, it will fall off and regenerate new hair. Normal people can lose 70~ 100 hairs every day, and at the same time have the same amount of hair regeneration. The growth period of hair is generally 2~7 years.
Extended data:
The growth rate of hair is about 0.27~0.4 mm per day. According to this calculation, fast-growing people can grow 1.2 cm a month, and slow-growing people can grow about 0.8~0.9 cm a month. Hair is produced by hair follicle cells, and its main component is protein. In summer, skin temperature is high, cell metabolism is vigorous, and hair grows fast and hard.
Hair is also metabolic, with an average of 60- 100 hairs falling off every day, which is medically called physiological alopecia. If alopecia exceeds 100, and long-term attention, it is likely to have developed alopecia, and it is best to consult a doctor.
Strengthening nutritional supplement, paying attention to reasonable and scientific diet, proper exercise and exercise, maintaining a comfortable mood and mental health, and ensuring adequate sleep every day have positive significance and role in the normal growth of hair. Appropriate strengthening of influence, such as combing hair frequently, stimulating blood circulation in the head and stimulating hair follicles, is also of great benefit to long hair.
References:
Baidu encyclopedia-hair
People's Network-Will the hair grow longer and denser after shaving fetal hair?
People's Network-Hair loss may indicate five diseases? Five foods promote hair growth
People's Daily Online-Does too long hair affect blood supply to the brain?