Rectal diseases refer to medical conditions that affect the function or structure of the rectum, which is the lower portion of the digestive system responsible for storing and expelling feces. These conditions can include inflammatory bowel diseases such as ulcerative colitis and Crohn's disease, infections such as bacterial or viral proctitis, benign growths like polyps or tumors, and malignant growths like rectal cancer. Symptoms of rectal diseases may include pain, bleeding, changes in bowel habits, and difficulty with bowel movements. Treatment options vary depending on the specific condition and severity but may include medications, surgery, or a combination of both.