The most common anorectal tumors are also the most aggressive. They include adenocarcinomas, malignant melanoma's and Kaposi's sarcoma.
Symptoms can vary and include pain, itching, feeling of a lump and blood in the stool. Over time, weight loss and thin stools develop.
While sometimes misdiagnosed as a hemorrhoid, anorectal tumors can also lead to severe blood loss and fistulas which is a connection between the bowel and another organ.
Having a colonoscopy regularly after the age of 50 (or earlier if there is a family history) is critical in timely diagnosis.