Being infected with the human papillomavirus (HPV) increases the risk of developing anal cancer. Risk factors include the following: - Being infected with human papillomavirus (HPV). - Having many sexual partners. - Having receptive anal intercourse (anal sex). - Being older than 50 years. - Frequent anal redness, swelling, and soreness. - Having anal fistulas (abnormal openings). - Smoking cigarettes. 
Who is at risk for Anal Cancer? ?