Stomach discomfort in the first month of pregnancy is mainly due to the thousands-fold increase in estrogen in the body after pregnancy, and the increase in estrogen causes water and sodium retention in the body. The increase in estrogen causes water and sodium retention in the body, which is not only under the skin but also in the mucosa of the gastrointestinal tract, resulting in mild edema in the mucosa of the gastrointestinal tract, leading to stomach discomfort and even nausea, vomiting, anorexia and other clinical symptoms, mainly caused by estrogen. It is recommended that after pregnancy, if the corresponding gastrointestinal reactions occur, if you can eat, try to eat something easily digestible to avoid stomach discomfort or nausea and vomiting due to friction of the gastric mucosa in an empty stomach.