<unk>  is an inflammation of the inner rectum. It mainly affects the rectal mucous membrane. The condition can be acute or it may be a chronic condition.<unk>  may be caused due to conditions such as ulcerative colitis or Chron's disease.
Rectitis
Chemical colitis
Proctocolitis
Perianal cellulitis
Volvulus
Diversion colitis
Ischemic colitis
Enterocolitis