Pregnancy weight loss may be caused by pregnancy reaction or fetal abnormality, pregnant women suffering from certain diseases, generally divided into the following cases: 1, pregnancy reaction: in early pregnancy, due to the increase of hormone levels in the body, such as estrogen, HCG increase, so that the gastrointestinal mucosa appears mild edema, so there will be nausea, vomiting, appetite loss and other clinical symptoms, due to poor appetite, eating less The situation of weight loss due to poor appetite, eating less, nutrition can not keep up, usually there is no need to worry too much, after 12 weeks of pregnancy early pregnancy reaction gradually disappears, appetite recovery, weight can be normal growth; 2, fetal abnormalities: in the middle and late stages of pregnancy, the weight loss of pregnant women may be related to fetal dysplasia, fetal arrest, low amniotic fluid and other factors. It is recommended to consult a doctor in time and cooperate with him to do uterine ultrasound examination to confirm whether the fetal development and amniotic fluid are normal; 3. Pregnant women suffer from certain diseases: a few pregnant women suffering from gestational diabetes may also experience weight loss. Doctors will recommend diet therapy and exercise therapy for pregnant women, and if blood sugar is not well controlled, insulin application will be recommended. In addition, weight loss during pregnancy can also be caused by other conditions, such as malnutrition during pregnancy, anemia and other conditions, it is recommended to seek medical advice in a timely manner, and according to the doctor’s guidance, to deal with the causes accordingly.