Generally, the early pregnancy reaction starts to appear from 6-7 weeks, and the vomiting reaches its peak from 12-14 weeks, and decreases to disappear after 16-18 weeks of pregnancy; some pregnant women may continue to have vomiting until late pregnancy or even delivery; vomiting in the 6th month of pregnancy may be caused by the enlarged uterus pressing on the stomach and intestines, which is normal, or it may be caused by improper diet or disease. The cause should be clarified and appropriate treatment and management should be given. The main causes of pregnancy vomiting in the 6th month of pregnancy are as follows: a. Normal: the reaction during pregnancy varies from person to person, vomiting in the middle of pregnancy may be a physiological phenomenon. The main reason is that the fetus gradually grows and develops and tops up to the stomach of the pregnant woman, so vomiting may also occur in the 6th month of pregnancy. At this time, the fetus needs more nutrition for growth and development, so pregnant women should pay attention to nutrition, eat foods rich in high quality protein and vitamins, eat less unhealthy foods high in fat, carbohydrates and salt, avoid cold drinks, milk tea, instant noodles and other foods with many additives, and have regular maternity checks. If a pregnant woman lacks nutrition due to pregnancy vomiting, she can follow the doctor’s advice to take appropriate drugs by mouth to help the pregnant woman and the fetus to replenish nutrition in time. Second, the abnormal situation: 1, improper diet: if pregnant women eat too much, too full, or eat unclean food, etc., resulting in gastrointestinal disorders, food can not be digested in time, will cause pregnant women vomiting and constipation. In this case, it is recommended that pregnant women pay attention to a light, easy-to-digest diet, avoid eating too greasy, cold diet, eat less and more meals, avoid overeating. You can do the right amount of exercise to promote digestion, so as to relieve the symptoms of pregnancy vomiting; 2, disease factors: if pregnant women combined with gastrointestinal diseases or liver disease, can also lead to vomiting, pregnant women are advised to go to the hospital in a timely manner, the relevant examination, to clarify the cause, for treatment.