Diarrhea in the third trimester can be caused by cold or eating cold food. It can also be after overeating, which can easily lead to diarrhea due to poor digestion of the stomach. It is also possible to eat spoiled food, causing enteritis, will appear diarrhea. When diarrhea occurs, if it is not serious, try to pay attention to a light diet and keep warm during this period, it can recover on its own. If the diarrhea is more serious, you need to go to the hospital to check the stool routine to determine the condition and then take symptomatic treatment. If the diarrhea is caused by a serious infection, you can take cephalosporin with montelukast for treatment. If the diarrhea is caused by indigestion, you can take a probiotic type of drug treatment, probiotic type of drug can play both to help digestion, and the role of anti-diarrhea.