Gastroenterology · Anorectal Disorders
The facts most likely to be tested
Press 1–5 to rate · ↑↓ to navigate
Internal hemorrhoids originate above the dentate line and are typically painless due to visceral innervation.
External hemorrhoids originate below the dentate line and present with severe perianal pain due to somatic innervation.
Bright red blood per rectum (BRBPR) on toilet paper or in the bowl is the classic presentation for internal hemorrhoids.
Thrombosed external hemorrhoids present as an acutely painful, tender, bluish perianal nodule.
Select patients with thrombosed external hemorrhoids benefit from early surgical excision, generally offered within 72 hours of symptom onset; otherwise the thrombus is self-limited and resolves over 7-10 days with conservative care.
First-line management for symptomatic internal hemorrhoids is conservative therapy consisting of high-fiber diet, increased fluid intake, and sitz baths.
Anoscopy is the diagnostic procedure of choice to visualize and grade internal hemorrhoids when the diagnosis is unclear or to rule out other pathology.
Vignette unlocked
A 34-year-old male presents to the urgent care clinic complaining of a sudden onset of severe anal pain that began 24 hours ago. He denies any history of similar symptoms, fever, or chills. Physical examination reveals a firm, tender, 1-cm bluish-colored perianal mass at the anal verge. The surrounding skin is intact without evidence of purulent drainage or fluctuance.
What is the most appropriate management for this patient?
Excision of the thrombosed hemorrhoid
The patient presents with a thrombosed external hemorrhoid within the 48-72 hour window, making early surgical excision a reasonable option offering faster symptom resolution and lower recurrence than conservative care, though the ASCRS recommendation is conditional and applies to select patients.
Full handout
High yield triage
Etiology / Epidemiology
Common in constipation, pregnancy, and straining. Increased venous pressure leads to vascular cushion displacement.
Clinical Manifestations
Internal: painless bright red blood per rectum. External: painful perianal mass, thrombosis.
Diagnosis
Clinical diagnosis via anoscopy for internal hemorrhoids. Colonoscopy required if red flags present.
Treatment
First-line: high-fiber diet and sitz baths. Avoid surgery for asymptomatic cases.
Prognosis
Excellent prognosis with conservative care. 90% resolve without surgical intervention.
Full handout
Epidemiology & Etiology
Prevalence peaks between ages 45-65. Primary risk factors include chronic constipation, low-fiber intake, pregnancy, and prolonged sitting on the toilet.
Pertinent Anatomy
Internal hemorrhoids originate above the dentate line (visceral innervation). External hemorrhoids originate below the dentate line (somatic innervation, highly sensitive).
Pathophysiology
Hemorrhoids are normal vascular cushions that become symptomatic when they engorge or prolapse. Increased intra-abdominal pressure causes venous congestion and weakening of the connective-tissue and smooth-muscle support of the anal cushions (the muscularis submucosae, or Treitz muscle). This leads to mucosal prolapse and subsequent bleeding or thrombosis.
Clinical Manifestations
Internal hemorrhoids present with painless hematochezia on toilet paper. External hemorrhoids present with acute perianal pain and a palpable, tender blue-hued mass if thrombosed. Red flags include weight loss, change in bowel habits, or anemia, which mandate ruling out colorectal cancer.
Diagnosis
Diagnosis is primarily clinical. Diagnosis rests on history and physical examination; digital rectal examination is recommended to exclude other anorectal pathology and assess sphincter tone, and anoscopy can be added to visualize internal hemorrhoids and exclude other pathology. Colonoscopy should be considered when no obvious source of bleeding is found, when there are alarm features (weight loss, iron-deficiency anemia, abdominal pain, new or progressive constipation, family history of colorectal cancer), or when hematochezia continues despite successful hemorrhoid treatment.
Treatment
First-line therapy is fiber supplementation and increased fluid intake. Symptomatic relief is achieved with sitz baths and topical analgesics. Do not perform rubber band ligation on external hemorrhoids due to extreme pain. Surgical hemorrhoidectomy is reserved for refractory internal hemorrhoids and large/prolapsing Grade III-IV disease.
Prognosis
Most cases respond to conservative management. Thrombosis is the most common complication, typically resolving in 7-10 days. Recurrence is common if dietary habits are not permanently modified.
Differential Diagnosis
Anal fissure: severe tearing pain with defecation
Colorectal cancer: weight loss and iron deficiency anemia
Rectal prolapse: full-thickness protrusion of rectal wall
Perianal abscess: constant throbbing pain and fever
Condyloma acuminata: wart-like lesions from HPV