RT Book, Section A1 Dooley-Hash, Suzanne A1 Herrman, Nicholas W.C. A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181041522 T1 Rectal Cancer T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1181041522 RD 2024/04/24 AB Rectal cancer is often asymptomatic, especially in early stages. It may also present with rectal mass, pain or bleeding, pain with passage of stool, anemia, or weight loss. More than 90% of cases occur in people over 50 years, and risk increases with age. Males are affected more commonly than females. Other risk factors include inflammatory bowel disease, family history of colorectal cancer or polyps, hereditary cancers such as familial adenomatous polyposis or hereditary nonpolyposis colorectal cancer (Lynch syndrome), low-fiber diet, and tobacco and alcohol use. There are multiple types of rectal cancers, with adenocarcinoma being the most common.