Diarrhea is frequent, loose and watery bowel movements. There are many causes of diarrhea but some common ones are bacterial infections, viruses, parasites, food intolerance, intestinal disease, bowel disorders, and reactions to medication. As well as the diarrhea itself, a person may experience abdominal cramps, bloating and nausea. Treatment options include fluid replacement, following a special diet, medication where required, herbal remedies, homoeopathy, and acupuncture.