Proctitis is a digestive disease in which the inner lining of the rectum, called rectal mucosa, is inflamed. It can be acute (short term) or chronic (long term) proctitis. Causes There are several causes of proctitis. Sometimes inflammation of the rectum is caused by sexually transmitted diseases, such as herpes, gonorrhea, or chlamydia. In other cases, the condition is associated with autoimmune digestive conditions causing inflammation in the colon or small intestine like ulcerative colitis or Crohn's disease. Proctitis...