When a woman has hair on her belly during pregnancy, it is generally believed that the increase in androgen secretion from the adrenal glands due to hormonal stimulation after pregnancy causes an increase in hair thickening on the body surface, so not only does she have hair on her belly, but she also has an increase in hair in her armpits and pubic mound. This is because after pregnancy, the adrenal cortex will be affected by the large secretion of estrogen during pregnancy, so it often leads to an increase in glucocortisol and a slight increase in the secretion of testosterone in the inner reticular zone, and androgens themselves can stimulate the increase in sweat hair on the surface of the body, so pregnant women will have pubic hair, axillary hair and a significant growth of hair on the stomach. This is generally considered to be a normal physiological phenomenon that occurs in every woman during pregnancy, so there is no need for any treatment, let alone anxiety and worry. At the same time, after a woman is pregnant, the secretion of melanocyte stimulating hormone will increase, and the stimulation of a large amount of estrogen and progesterone may lead to an increase in melanin deposition, thus causing significant pigmentation in the white line of the abdomen of women, so at this time, in addition to the performance of the belly hair, there will also be obvious stretch marks. This usually occurs in the third trimester of pregnancy, so there is no need to be anxious and worried because this phenomenon will naturally ease after the pregnancy is over.