How much hair fall every day is normal

  Hair has a natural growth cycle and resting period. For adults, it is normal to lose 50-60 hairs per day. Therefore, a large amount of hair on a comb or bathtub floor drain does not necessarily mean hair loss.
  When the hair is relatively long, the number of dozens of hairs looks larger, which will give the illusion of hair loss. In addition, hair loss may also be related to the season.
  Dermatologists from the Zurich University Hospital studied the hair loss of 832 women and found that the hair does have seasonal changes. The proportion of hair in the resting period was the highest in July. Inferred from the hair resting period, these hairs should fall out around October, so Hair falls more easily in the fall.
  In 2017, American scholars used Google Trends big data analysis and found that hair loss is most common in summer and autumn.
  What about the situation in our country? A study conducted in Shanghai in 2014, involving 41 healthy men and women, found that the proportion of hair resting period was the highest from August to September, which was basically in line with the above data. The latitude of these countries is similar to that of our country. Therefore, it can basically be said that seasonal hair loss exists, and autumn is the most prone to hair loss season.
  However, there is no need to worry about hair loss in autumn, because the hair lost in autumn will be replenished in spring. Some people joked that this is the same as the seasonal moulting of pets. Of course, there is no conclusive mechanism research evidence for human seasonal hair loss.
  So, what is real hair loss? Medically, if the number of hairs lost per day is more than 100 for more than one month without any signs of stopping, and when severe, some areas appear thinning, this condition is called “hair loss”.
  But probably no one will have the patience to count 100 hairs, so there is a relatively simple “hair pulling self-test”-stretch out your five fingers, insert the root of the hair, hold the palm of your hand close to the top of the head, and then put your five fingers together to clamp the hair. Don’t be too loose. Then gently pull the hair and do this 6 to 8 times. If there are more than three or four hairs caught between the fingers each time, hair loss is likely to occur. At this time, you can consider going to the dermatology or endocrinology department of the hospital for related examinations.
  For the most common seborrheic alopecia, in the past, everyone mistakenly believed that it was caused by oily hair. In fact, it is mainly related to androgens. The hair follicles and sebaceous glands are sensitive to androgens-the sebaceous glands will become hypertrophy under the action of androgens and produce more oil; while the hair follicles will become smaller under the influence of androgens and give birth to hair. It becomes thinner and shorter, and it will fall off before it grows long enough. This is the cause of hair loss.