One form of ulcerative colitis, a condition called proctosigmoiditis, primarily affects the lower colon and rectum. Due to its origin in the lower colon, bouts of bloody diarrhea followed by an inability to have a bowel movement (constipation) may alternate.
3. Severe Dehydration
Ulcerative colitis that runs along the entire length of the colon, causing ulcerations and tissue inflammation, is known as fulminant colitis. Due to the explosive diarrhea it causes, this form of colitis can cause severe dehydration and shock.
4. Rectal Pain and Bleeding
Ulcerative colitis that causes pain and inflammation only in the area of the anus (or rectum) is known as proctitis. This form of the condition is known to cause rectal bleeding as well as the constant feeling of having to take an urgent bowel movement.
5. Sudden and Significant Weight Loss
Pancolitis is a form of colitis that results in bouts of diarrhea so explosive, and sometimes bloody, that the patient will suffer from severe and sudden weight loss as well as associated fatigue due to dehydration and decreased absorption of calorie from foods.
Anemia, usually of severe iron deficiency type, can occur if an ulcerative colitis patient suffers from bloody and explosive diarrhea. Due to the constant blood loss and bleeding from the rectum, the sufferer can become very weak. If you suspect you might be anemic, your doctor should perform a blood test to verify this possibility.