Mucous colitis is a condition that refers to the inflammation of the colon or large intestine. This condition is also known as irritable bowel syndrome (IBS), spastic colon, and functional bowel syndrome. These synonyms are used because the condition is characterized by abdominal discomfort and changes in bowel movements, such as diarrhea, constipation, or both. The term "mucous colitis" is used because the chronic inflammation in the colon causes an increase in the production of mucus, which can lead to painful and uncomfortable symptoms. While the exact cause of mucous colitis is unknown, it is often triggered by stress, diet, and other lifestyle factors.