Diarrhea and stomach pain in early pregnancy may be caused by improper diet, intestinal dysfunction and gastroenteritis. 1. Improper diet: Due to the sensitive nature of pregnant women, eating cold food may lead to diarrhea, abdominal pain and other symptoms, in addition, the abdomen is cold may also cause such symptoms. 2. Intestinal dysfunction: pregnant women in early pregnancy due to the increase in the level of progesterone, which may lead to gastrointestinal peristalsis slowed down, triggering gastrointestinal dysfunction, the patient may experience diarrhea, abdominal distension, abdominal pain, acid reflux and other uncomfortable symptoms. 3. Gastroenteritis: As the immunity of pregnant women decreases during pregnancy, the stomach and intestines are easily infected by bacteria, viruses and other pathogens, which can cause gastroenteritis and other diseases, and pregnant women will experience diarrhea, abdominal pain, nausea, vomiting and other symptoms. It is recommended that pregnant women seek timely medical examination to clarify the cause of the targeted treatment, to develop good dietary habits in life, and should also conduct regular obstetric examination to facilitate the grasp of fetal development.