Hemorrhoids: Definition, Risk Factors, Clinical Symptoms, and Treatment
Definition
Hemorrhoids are the symptomatic enlargement and distal displacement of normal anal cushions—vascular connective tissue structures in the subepithelial space of the anal canal that contribute 15-20% of resting anal pressure and ensure complete anal closure 1. These cushions consist of arteriovenous communications between terminal branches of the superior rectal arteries and rectal veins, suspended by smooth muscle from the internal anal sphincter 1.
Risk Factors (Etiology)
The pathogenesis involves abnormal swelling of anal cushions, stretching of suspensory muscles, and dilation of the submucosal arteriovenous plexus 1. While commonly believed risk factors include:
- Inadequate fiber intake
- Prolonged sitting on the toilet
- Chronic straining at stool
- Constipation
- Pregnancy (0.2% require urgent hemorrhoidectomy for incarcerated prolapsed hemorrhoids)
- Family history
It is important to note that rigorous proof for most of these associations is lacking 1. Elevated anal resting pressure is consistently found in hemorrhoid patients compared to controls, though whether this is causative or consequential remains unclear 1.
Peak prevalence occurs between ages 45-65, with a community-wide prevalence of 4.4% in the United States 1.
Clinical Symptoms
Internal Hemorrhoids
Most hemorrhoidal symptoms arise from enlarged internal hemorrhoids 1:
- Bleeding: Bright red blood (due to arterial oxygen tension from arteriovenous communications), appearing as scanty blood on toilet paper or copious blood squirting into the toilet bowl 2, 1
- Protrusion/Prolapse: Tissue protruding through the anal canal
- Itching: From mucus deposition on perianal skin due to mucosal prolapse 1
- Discomfort: Generally NOT significant pain unless thrombosed 3
External Hemorrhoids
External hemorrhoids are typically asymptomatic unless thrombosis occurs, presenting as an acutely painful perianal lump 1. Persisting skin tags after thrombosis resolution can cause hygiene problems and secondary irritation 1.
Classification System
Internal hemorrhoids are graded by severity 2:
- First-degree: Bleed but do not protrude
- Second-degree: Protrude with defecation but reduce spontaneously
- Third-degree: Protrude and require digital reduction
- Fourth-degree: Cannot be reduced
Critical Diagnostic Caveat
Because none of these symptoms are specific for hemorrhoids, diagnosis should only be made after appropriate physical examination with anoscopy has ruled out other disorders such as anal fissure, fistula, or abscess 2. Sharp pain on defecation suggests anal fissure, not hemorrhoids 3.
Treatment
Treatment follows a stepwise algorithm based on hemorrhoid grade and symptom severity:
First-Line: Medical Management (Grade I Hemorrhoids)
The cornerstone of medical therapy is adequate intake of fiber and water 2. Additional measures include:
- Dietary and lifestyle modifications: Increase fiber intake, avoid straining or prolonged time on toilet 3
- Topical treatments: Corticosteroids and analgesics for perianal skin irritation from mucus discharge or fecal seepage 2. Prolonged use of potent corticosteroid preparations may be harmful and should be avoided—limit to 2 weeks maximum 2, 3
- Sitz baths: Often advised though scientific data is limited 3
Second-Line: Office-Based Procedures (Grades II-III, or Failed Medical Therapy)
Rubber band ligation is preferred over other nonoperative techniques because it has the lowest recurrence rate, despite causing slightly more discomfort than alternatives 2. The meta-analyses show sclerotherapy has relatively high relapse rates, while rubber band ligation provides longer-term benefits for prolapsing hemorrhoids and recurrent bleeding 2, 3.
Other nonoperative options include:
- Infrared coagulation (similar short-term benefits to banding) 3
- Injection sclerotherapy (only for grades I-II, higher relapse rate) 2
- Diathermy/bipolar coagulation 2
Cryotherapy has a high complication rate and is no longer recommended 2.
Critical safety warning: Immunocompromised patients are at increased risk for severe infection, particularly after rubber band ligation 2. Patients must be counseled about the small possibility of pelvic sepsis and instructed to present to the emergency department immediately if symptoms develop 3.
Third-Line: Surgical Hemorrhoidectomy
Hemorrhoidectomy is the most effective treatment but is associated with significantly more pain and complications than nonoperative techniques; accordingly, surgery should be recommended only for a small minority of patients 2.
Indications for elective hemorrhoidectomy 2:
- Failure of medical and nonoperative therapy
- Symptomatic third-degree, fourth-degree, or mixed internal and external hemorrhoids
- Symptomatic hemorrhoids with concomitant anorectal pathology requiring surgery
Grade IV internal hemorrhoids require surgical hemorrhoidectomy 3. Consultation with a surgeon should be offered to patients with grade III internal hemorrhoids who fail banding procedures or have associated external hemorrhoids 3.
Special Situations
Thrombosed External Hemorrhoids: If diagnosed early (within first 2-3 days), best managed by excision under local anesthesia in the office 2, 4. Excision is not required for patients whose symptoms are resolving, as pain typically resolves after 7-10 days 2.
Pregnancy: Hemorrhoids occur in up to two-thirds of pregnant women. Treatment should generally involve conservative management including fiber, treatment of constipation, and topical ointments 3. Standard treatments like banding can be considered postpartum or if planning further pregnancies 3.
Inflammatory Bowel Disease: In patients with active Crohn's disease or ulcerative colitis, hemorrhoid disease management should be delayed until complete remission is achieved 3.
Cirrhosis/Portal Hypertension: Patients with cirrhosis and hemorrhoids should be carefully examined to not confuse hemorrhoids with rectal varices. Hemorrhoids can be treated with banding or infrared coagulation. In patients with significant coagulopathy (platelet count <50,000/μL or INR >2.0), infrared coagulation is preferred to banding 3.
Mandatory Evaluation for Bleeding
All patients who report rectal bleeding should undergo sigmoidoscopy 2. The proximal colon should be evaluated by colonoscopy or air-contrast barium enema to assess bleeding that is not typical of hemorrhoids (dark blood or blood mixed in feces), guaiac-positive stools, or anemia 2. Individual patient risk factors for colorectal cancer (age, family history, personal history of polyps) should guide the extent of colonic evaluation 2.