The timing of nausea after pregnancy varies among individuals, as do the symptoms. For the majority of the population, it may appear around 40 days after menopause, and the reaction usually lasts for 1 month to gradually reduce. After pregnancy, due to the endocrine system and the body’s hormone levels change dramatically, can stimulate the smooth muscle of the gastrointestinal tract, so that the gastrointestinal tract to produce a series of discomfort. Generally, nausea will gradually appear in 4-6 weeks of pregnancy. Early pregnancy reaction generally include cold, dizziness, salivation, nausea, vomiting, fatigue, like to eat acidic food, anorexia greasy and other symptoms, is a normal physiological phenomenon. However, usually after twelve weeks of pregnancy, the symptoms of pregnant women can be gradually reduced or eliminated, but individual pregnant women may continue until 16-18 weeks. In addition, women are advised to eat soda crackers or drink hot milk in the morning and evening during the early stages of pregnancy to prevent nausea and other symptoms. It is also possible to improve the appetite of pregnant women by eating fewer and more frequent meals to satisfy the nutritional needs of the mother and the fetus.