Occasional diarrhea in early pregnancy will not cause miscarriage, but if diarrhea occurs for a long period of time, it may cause miscarriage and should be taken seriously. Generally speaking, if a pregnant woman has occasional diarrhea in early pregnancy, it will not cause significant harm to the body and will not directly cause miscarriage, so there is no need to worry too much. In daily life, you need to eat a reasonable diet, pay attention to keep warm. However, if diarrhea occurs for a long time in early pregnancy, it may be caused by improper diet, cold abdomen, infection and other factors. When diarrhea is severe, it will lead to an increase in prostaglandins, causing excessive uterine contractions, which will increase the chance of miscarriage. Therefore, if the patient has diarrhea for a long time, it needs to be taken seriously. If a pregnant woman has diarrhea for a long time in the early stages of pregnancy, she should go to the regular hospital for examination to identify the cause of the disease and actively cooperate with the doctor to take relevant treatment measures, so as to avoid delaying the condition. At the same time, you need to ensure sufficient rest time, do not overwork.