The symptoms of vomiting occur after about six weeks of pregnancy. Such symptoms do not occur in everyone. About half of the women experience dizziness, fever, drowsiness, loss of appetite, and nausea and vomiting. In particular, vomiting is more pronounced in the morning. This is clinically called early pregnancy reaction, which is caused by the increase of chorionic gonadotropin in the body at the early stage of pregnancy, as well as nausea and vomiting caused by the slow evacuation of gastrointestinal function and the reflux of stomach contents into the esophagus after pregnancy. In addition, you must pay attention to the diet, do not eat too greasy, try not to eat cold, spicy stimulating food, pay attention to rest.