Diarrhea in pregnant women can affect the development of the fetus, so it should be treated promptly. However, since medication may affect the fetus, when a pregnant woman has diarrhea that does not produce an infection, she can start with lifestyle regimen and choose to take medication only when the regimen does not work. The first option is to properly replenish the body with lost water and electrolytes, to observe whether the development of the fetus is affected, and to prevent miscarriage or dehydration in pregnant women. Secondly, when the diarrhea is mild, the normal bowel movement will resume after 24 hours, but when it does not return to normal, a routine stool examination and parasite examination should be done, especially a colonoscopy if necessary, to determine whether there is an intestinal disease. If the diarrhea is followed by pre-eclampsia, which affects the growth and development of the fetus, timely fetal preservation treatment is required.