Transit time refers to the time it takes for food to move through the digestive tract, from swallowing to expulsion as faeces. Transit time disorders include disorders which people would often refer to as constipation or diarrhoea.

Ulcerative colitis is a type of inflammatory bowel disease characterised by inflammation of the large intestine mucosa (lining). Ulcerative colitis usually presents with rectal bleeding, diarrhoea or passage of mucus from the rectum. Treatment involves a combination of steroids, aminosalicylate medications, and surgery in advanced cases.