The growth of sweat hair after pregnancy is mainly caused by changes in hormone levels in the body during pregnancy. In women, the hypertrophy of the pituitary gland during pregnancy is obvious, 1-2 times as much as during non-pregnancy. The adrenal glands are affected by a large amount of estrogen, and the adrenal cortex widens in the bundle during pregnancy, and the secretion of sugar cortisol increases, while the secretion of testosterone also increases, which can be manifested as more and longer hair in pregnant women, such as pubic hair and axillary hair increase, thickening and other symptoms, which are normal. After delivery, the body’s hormone levels return to normal, this symptom will slowly disappear, so there is no need for special treatment, and do not worry too much. Avoid excessive intake of sweet and greasy food and eat more fresh vegetables.