In the early stages of pregnancy, the phenomenon of stomach upset is a normal pregnancy reaction. In the first month of pregnancy, the hormone secretion in the body affects the increase of estrogen or progesterone, which will cause the relaxation of the pyloric sphincter of the stomach, resulting in excessive secretion of stomach acid, nausea, vomiting or loss of appetite and anorexia. It is possible that vomiting may occur after smelling some greasy smell, especially in the morning when it is more serious, this situation does not require special treatment, try to pay attention to a light diet, do not eat too greasy food, you can eat a moderate amount of fresh fruits and vegetables, you can also drink a moderate amount of yogurt, or drink probiotics or acidic food, which can stimulate gastric acid secretion, can This can stimulate the secretion of stomach acid, which can reduce the phenomenon of stomach distress.