Differential Diagnosis of Painful Defecation

Primary Differential Diagnoses

Hemorrhoids (thrombosed or prolapsed) cause pain when thrombosed or incarcerated; digital rectal examination reveals radial bulging of discrete anal cushions rather than concentric protrusion, as noted by the World Journal of Emergency Surgery 1
Anorectal abscess/fistula presents with constant throbbing pain, fever, and localized tenderness on digital rectal examination, according to Praxis Medical Insights: Practical Summaries of Clinical Guidelines 2
Rectal prolapse is a full-thickness protrusion causing pain, especially if incarcerated or strangulated; examination shows concentric protrusion of rectal wall, as described by the World Journal of Emergency Surgery 1

Proctitis from inflammatory bowel disease, radiation, or sexually transmitted infections requires sigmoidoscopy with biopsy for diagnosis, as stated in Gut 3
Severe colitis or infection is a contraindication for certain treatments; requires clinical correlation, according to Annals of Oncology 4 and Annals of Oncology 5

Dyssynergic defecation is characterized by the inability to coordinate pelvic floor muscles during evacuation; presents with excessive straining with soft stools and inability to pass enema fluid, as noted by Praxis Medical Insights: Practical Summaries of Clinical Guidelines 6
Levator ani syndrome is characterized by acute localized tenderness along puborectalis muscle on digital rectal examination, according to Praxis Medical Insights: Practical Summaries of Clinical Guidelines 6

Anal or rectal cancer should be suspected with rectal bleeding, unexplained weight loss, or palpable mass on digital rectal examination, as stated by the World Journal of Emergency Surgery 7

Fecal impaction is a hard stool mass palpable on digital rectal examination; requires disimpaction, according to Annals of Oncology 4 and Annals of Oncology 5
Rectal intussusception may be occult; requires defecography for diagnosis, as described by the Journal of the American College of Radiology 8

The American College of Radiology recommends defecography for suspected structural pelvic floor disorders, such as rectal intussusception, as stated in the Journal of the American College of Radiology 8

The European Society for Medical Oncology suggests that bowel obstruction requires urgent intervention, including plain abdominal X-ray, NPO status, IV crystalloids, and nasogastric decompression, as noted by the World Journal of Emergency Surgery 7
The American College of Surgeons recommends urgent surgical drainage for anorectal abscess, according to Praxis Medical Insights: Practical Summaries of Clinical Guidelines 2

The American Gastroenterological Association recommends referral to a specialist for failure to respond to conservative measures after 1-2 weeks, alarm features present, abnormal digital rectal examination, or suspected malignancy, as stated by Praxis Medical Insights: Practical Summaries of Clinical Guidelines 6 and Gut 3

The National Institute for Health and Care Excellence recommends colonoscopy only if alarm features are present or age-appropriate screening has not been completed, as noted by Gut 3 and Praxis Medical Insights: Practical Summaries of Clinical Guidelines 6