1. Affect the normal breathing of human body: Breathing is the process of gas exchange between human body and external environment. Body-shaping underwear tightens the abdomen, which not only limits the breathing movement of the abdomen, but also increases the ventilation resistance of the lungs, which also has a certain impact on chest breathing. In the long run, it will lead to long-term poor breathing and insufficient ventilation, resulting in chest tightness, general weakness and other symptoms. In severe cases, it may even cause systemic purple spots, myocardial ischemia and heart failure due to lack of oxygen. 2. Gastrointestinal peristalsis is limited: Gastrointestinal peristalsis is of great significance to the digestion, absorption and excretion of nutrients. The restraint of body shaping underwear on the abdomen will not only limit gastrointestinal peristalsis, but also make the abdominal organs lack oxygen, and the stomach and small intestine lack exercise and oxygen, which will cause symptoms such as abdominal distension, indigestion, loss of appetite, nausea and vomiting, and will induce malnutrition and even anorexia for a long time. Insufficient exercise of the large intestine causes obstacles to the body's excretory function, constipation, black stool and even hemorrhoids. 3. Decreased hormone secretion: Tight-fitting underwear indirectly oppresses ovaries to some extent by tightly squeezing abdominal skin, which affects hormone secretion. The decrease of estrogen secretion will cause a series of physiological and psychological changes and physical discomfort to the body, such as emotional instability, insomnia and night sweats, etc., and will also lead to menstrual disorder, decreased sexual desire and sexual life quality, affect reproductive function, and even induce cardiovascular diseases in severe cases. Insufficient progesterone secretion will affect reproductive function. Long-term compression of uterus will make it shift, and abnormal position of uterus will lead to infertility.