Nausea occurs when you are hungry in the early stages of pregnancy, mainly because the hormone levels in the body increase, which causes edema in the mucous membrane of the gastrointestinal tract, so nausea and vomiting occur. In the case of hunger the stomach is empty and the gastric mucosa will rub, so nausea will occur, which is the cause of nausea in the case of an empty stomach. It is definitely uncomfortable when early pregnancy reaction occurs, but you must learn to be strong, and it is recommended to eat as little as possible to avoid the friction of the stomach mucosa in the fasting state and aggravate the situation of early pregnancy reaction. In addition, if you have severe nausea and vomiting and cannot eat, you can go to the hospital to give rehydration and correct electrolytic disorders so as to facilitate the normal development of the embryo.