👉 Proctosigmoiditis is a condition that refers to inflammation of the lining of the rectum, which can lead to symptoms such as abdominal pain and difficulty with bowel movements. Proctosigmoiditis occurs when there is a buildup of fluid in the rectum, which can cause discomfort or pain. It's also known as rectal ulcerative colitis, which is an inflammatory disease of the large intestine (colon).