What are the causes of hair loss and hair fall?

  One, may be because of childbirth + stress?
  In the case of men, most of them are seborrheic alopecia, while in the case of women, there are four main factors that lead to it: postpartum hair loss, genetic hair loss, tension hair loss and spiritual hair loss.
  Postpartum hair loss: It is mainly due to the change of hormone level during pregnancy. After pregnancy, the secretion of estrogen increases and the hair is renewed slowly, and when the hormone level is normal after delivery, the hair falls off one after another, and the newborn hair does not have time to grow due to the trauma of delivery, causing a lot of hair loss. Most of the postpartum hair loss is a temporary condition and can be recovered in a year or so with good maintenance.
  Hereditary hair loss: If your parents have hair loss symptoms or a high hairline, the chances of your hairline shifting back are relatively high, and hereditary hair loss is not necessarily a high hairline at birth, but many start to shift back from the age of 20 to 30.
  Tension hair loss: This is a physical factor. The constant high tension of a tight ponytail or high coiffure can damage the hair follicles at the hairline, so if you don’t want your hairline to recede, you should try to avoid such hairstyles.
  Mental hair loss: This is also a relatively common cause of hair loss, mental stress will be too large to make the hair standing muscle contraction, poor blood flow, reducing the quality of the environment in which the hair survives, which leads to hair loss; because of postpartum depression, many postpartum hair loss also has a mental factor.
  Second, hair loss and these reasons
  1, frequent hair dyeing, perm
  Frequent hair dye or perm, using poor quality hair dye or perm potion, will greatly increase the damage to the hair keratin, causing damage to the hair, internal moisture and nutrient loss, so that the hair becomes dull, brittle, split ends, shedding.
  2, excessive weight loss
  Hair is mainly composed of protein and trace elements of copper, iron and zinc, if dieting is excessive, it will make protein, vitamins and minerals and other nutrients intake is insufficient, resulting in malnutrition and abnormal metabolism of the body, leading to hair loss. The American Academy of Dermatology believes that the lack of protein in the diet will limit the body’s supply of protein to the hair, and hair loss will occur after two or three months.
  3.Menopause
  Studies have found that hair loss is a common symptom of menopause. Women in the menopause, endocrine changes, such as ovarian function, estrogen secretion level decreases, mood swings, insomnia and irritability, stress, etc. will lead to hair loss.
  4.Thyroid disease
  Hair loss is one of the symptoms of thyroid disorders. The thyroid gland is mainly responsible for regulating the metabolism of carbohydrates, fats and proteins, but when the thyroid gland functions abnormally, the hormones needed for the metabolism of the scalp hair follicles cannot be formed, resulting in long-term dormancy of the hair, leading to hair loss. Hair will also be unable to grow due to lack of protein and vitamins.
  5.Dry weather
  In the dry weather of autumn and winter, the skin loses a lot of moisture, resulting in a reduction in the secretion of sebaceous glands in the scalp and shrinking of hair follicles, which makes hair dry and fall out easily. If you have seborrheic alopecia, alopecia areata or alopecia areata, hair loss will be more obvious in autumn and winter. Hair loss of no more than 100 hairs per day is considered normal.
  Male pattern baldness: thinning, yellowing and softening of the hair on the front and crown of the head, baldness on the top of the forehead and upward movement of the hairline and sideburns on the forehead.
  Female pattern baldness: thinning hair on the top of the head, but not “front baldness” like men.
  Hair loss self-examination: three looks and two ones.
  Three looks: pillow, floor, hairline.
  One pass: bathroom floor drain is the “hair gathering area”.
  A touch: touch the hair every day, whether it is thin, soft.
  Three, hair loss of the four therapies
  1.Spiritual therapy
  Eliminate mental depression, mental instability, daily anxiety will lead to hair loss, the deeper the degree of depression, the faster the rate of hair loss. For women, life is busy while maintaining a proper amount of exercise, hair will be lustrous black, full of life. For men, on the contrary, the more stressful the life and the busier the work, the higher the chance of hair loss. Therefore, deep breathing, walking and relaxing gymnastics can eliminate the mental fatigue of the day.
  2.Diet therapy
  Iron and zinc deficiency can lead to a lot of hair loss. It is recommended to eat more green and yellow vegetables and fruits, such as spinach and soybeans, to supplement iron. Zinc supplementation can eat oysters, which are rich in zinc and also contain some healthy proteins, while 97% of hair is made up of proteins.
  The luster of hair is related to the role of thyroid gland, iodine supplementation can enhance the secretion function of thyroid gland, which is beneficial to hair health. You can eat more seaweed, nori and other foods. Seborrheic dermatitis should pay attention to a light diet, eat less stimulating food, eat more fruits and vegetables or take vitamin B6 and B2 internally.
  For hair loss caused by excessive weight loss, just re-assure a balanced nutrition. Less smoking, moderate alcohol consumption, less oily, sugary and spicy food, do not eat walnuts and sesame seeds fiercely.
  3.Life habits
  Diligent hair washing can clean hair, clean hair grease, grease and dust too much will cause the scalp lipid gland clogging, so that the hair early into the resting period. But not too often, otherwise it will make the scalp dry, and then hurt the hair. It is best to wash your hair every 2~3 days, once every 1~3 days for oily and once every 3~5 days for dry.
  Every morning and evening you can comb your hair, each time a hundred comb, can effectively massage the scalp, stimulate blood circulation, increase hair ventilation, to stimulate hair growth has a very good effect. Less late nights and good sleep. Adequate sleep to ensure the normal secretion of various hormones in the body, so that the skin and hair for good metabolism. You should try to ensure that you go to sleep before 11:00 pm and get enough sleep for 7 hours a day.
  4.Massage therapy
  Leisure time, you can massage the scalp. Use the “five-finger comb”, that is, the five fingers naturally relaxed, spread out, like a comb.  
  Then comb from the forehead to the back of the head, with the location of the fingers, so that it is not easy to hurt the scalp. Massage for hair loss, to be a little stronger, so that the scalp to be stimulated, comb a 50 times or so, until the scalp has a sore feeling.