Diarrhea after an IV is not normal. Some people do not warm up the liquid during the drip, so the medication is relatively cold in nature. Since the temperature of the drip is relatively low, the sudden input into the human body will cause the abdomen to get cold, and some people may even induce intestinal cramps as a result, which will lead to rapid intestinal peristalsis and cause diarrhea symptoms. When administering an IV during cold weather, you should try to warm the IV before injecting it to reduce the sensitivity reaction caused to the intestinal flora. When an IV is injected, it sometimes causes an allergic reaction to the body, so diarrhea symptoms can occur. There are also some people who have eaten foods that are too greasy and not easily digested and absorbed after the infusion, which are not directly related to the IV. When diarrhea occurs after an IV, hot compresses should be applied to the abdomen and montelukast can be taken appropriately to stop the diarrhea.