After pregnancy, nausea and vomiting can occur because of the different individual differences and the effect of estrogen, which can cause water and sodium retention and lead to mild edema in the mucosa of the gastrointestinal tract. If it is just nausea in early pregnancy but not vomiting out, it may be because: first, the degree of nausea is relatively mild and not enough to cause the phenomenon of vomiting. Secondly, there is no stomach content in the stomach, fasting state, so also will not vomit out. It is recommended that if this kind of early pregnancy reaction occurs after pregnancy, it is best to first give dietary conditioning, such as eating more easily digestible food to reduce the burden on the gastrointestinal tract, which to some extent will also reduce the symptoms of nausea and vomiting. In addition, if you are clinically unable to eat, you must go to the hospital as soon as possible to give the appropriate examination, and according to the results, give rehydration for treatment.