Differential Diagnosis for Redness on Rectum

• Single most likely diagnosis
  • Hemorrhoids: This is a common condition that can cause redness, itching, and discomfort in the rectal area due to swollen veins.
• Other Likely diagnoses
  • Anal fissure: A small tear in the lining of the anus can cause pain, bleeding, and redness.
  • Proctitis: Inflammation of the rectum can be caused by infections, allergies, or irritation, leading to redness and discomfort.
  • Rectal prolapse: A condition where the rectum loses its normal attachments inside the body, allowing it to protrude out, which can cause redness and irritation.
• Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
  • Rectal cancer: Although less common, rectal cancer can present with redness, bleeding, and changes in bowel habits, making it crucial not to miss this diagnosis.
  • Inflammatory bowel disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause severe inflammation and redness in the rectum and should not be overlooked.
  • Infectious proctitis: Certain infections, such as those caused by sexually transmitted diseases (e.g., gonorrhea, herpes), can lead to severe inflammation and require prompt treatment.
• Rare diagnoses
  • Solitary rectal ulcer syndrome: A condition characterized by the presence of an ulcer in the rectum, which can cause redness, bleeding, and difficulty with bowel movements.
  • Lymphogranuloma venereum (LGV): A sexually transmitted infection that can cause proctitis, leading to redness, pain, and discharge.
  • Rectal vasculitis: Inflammation of the blood vessels in the rectum, which can be associated with systemic diseases and cause redness and bleeding.