Apple cider vinegar mixed with water usually does not cause diarrhea, but if it is mixed with unclean water or if spoiled apple cider vinegar is used, it may cause diarrhea. Apple cider vinegar is a kind of drink made by fermenting apple juice and then mixing it with apple juice. Usually, if you choose apple cider vinegar produced by regular manufacturers without expiration date and mix it with clean water, you won’t get diarrhea after drinking it. However, if you choose spoiled or expired apple cider vinegar mixed with water or unclean water, it may cause acute gastroenteritis and other diseases and lead to diarrhea. If you have diarrhea after drinking apple cider vinegar to water, we recommend you to go to the hospital.