Frequent diarrhea is a common symptom of ulcerative colitis (UC). Remaining hydrated is important for someone with UC because frequent diarrhea can lead to dehydration, a potentially serious health condition.UC is an autoimmune disorder that causes inflammation in the lining of the large intestine, or colon. Common symptoms of UC include abdominal pain, bloody stool, and diarrhea.
Source: Medical News Today