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Hemorrhoids
Definition
Hemorrhoids are dilated, tortuous vascular channels (submucosal veins and arteriovenous connections) within the anal canal and perianal region. They form part of normal anatomy - specifically the "anal cushions" - and only become a disease when they enlarge, prolapse, or cause symptoms. They connect the portal and caval venous systems and thus can relieve elevated venous pressure, in a way analogous to esophageal varices.
- Sleisenger and Fordtran's Gastrointestinal and Liver Disease, p. 2671
- Robbins & Kumar Basic Pathology, p. 286
Epidemiology
- Affect approximately 5-10% of the general population (some estimates range up to 25% of adults in developed countries)
- Hemorrhoidal complaints account for 1.9 to 3.5 million physician visits annually in the USA
- Rare in persons under age 30 (except during pregnancy)
- No strong gender predilection, though pregnancy is a major risk factor in women
Anatomy: Internal vs. External
The dentate line (pectinate line) is the anatomical dividing point:
| Feature | Internal Hemorrhoids | External Hemorrhoids |
|---|---|---|
| Location | Above the dentate line | Below the dentate line |
| Epithelium | Columnar or transitional mucosa | Squamous epithelium |
| Pain | Usually painless (unless prolapsed/thrombosed) | Painful (sensory innervation) |
| Bleeding | Bright red, common | Less common |
| Venous plexus | Superior hemorrhoidal plexus | Inferior hemorrhoidal plexus |
Typical anatomical positions: left lateral, right posterior, and right anterior (3 o'clock, 7 o'clock, 11 o'clock positions). Hemorrhoids found elsewhere should raise suspicion for other pathology (carcinoma, lymphoma, condyloma).
Pathogenesis
The main mechanisms are:
-
Sliding anal cushion theory: Loss of connective tissue support (particularly the suspensory ligament of Parks) causes the vascular cushions to slide distally. Elevated circulating matrix metalloproteinases contribute to connective tissue degradation.
-
Vascular engorgement: Raised intra-abdominal or venous pressure causes engorgement of the hemorrhoidal venous plexus.
-
Portal hypertension: Hemorrhoids may form as portosystemic collaterals, analogous to esophageal varices, though they are far less serious.
Predisposing factors:
- Chronic constipation and straining at defecation
- Prolonged sitting on the toilet
- Low-fiber diet
- Obesity
- Pregnancy (venous stasis and increased intra-abdominal pressure)
- Portal hypertension
- Loose, frequent stools (paradoxically also a risk, due to trauma)
Classification of Internal Hemorrhoids (Grade System)
| Grade | Description |
|---|---|
| I | Bleed (and may be enlarged) but do NOT prolapse |
| II | Prolapse on straining/defecation; reduce spontaneously |
| III | Prolapse; require manual reduction |
| IV | Remain permanently prolapsed; cannot be reduced |
This grading directly guides treatment selection.
Clinical Features
Symptoms:
- Bleeding - the most common symptom; painless, bright red blood on toilet paper, coating stool, or dripping into the bowl. Rarely, blood accumulates in the rectum and is passed as dark blood or clots.
- Prolapse - tissue protrusion during or after defecation
- Perianal moisture and pruritus ani - from mucus or seepage around prolapsed tissue
- Swelling and feeling of fullness
- Pain - usually only with thrombosis or external hemorrhoids. Internal hemorrhoids without thrombosis are typically painless.
- Soiling - blood or mucus on underwear
Important: Patients commonly attribute any anal symptom to hemorrhoids. In practice, many patients presenting with "hemorrhoids" have a fissure, pruritus ani, warts, or another condition. Hemorrhoids and other anal pathology (e.g., fissure, carcinoma) frequently coexist.
Diagnosis
- History and physical examination are the foundation
- Anoscopy (with a beveled or slotted anoscope) - the key diagnostic procedure; visualizes degree of protrusion and identifies bleeding sites
- Flexible sigmoidoscopy - internal hemorrhoids can be seen on retrograde view
- Examination may be entirely normal between symptomatic episodes
- Colonoscopy should be considered to exclude colon cancer, particularly when bleeding is the presenting complaint in patients of appropriate age
Treatment
1. Medical (Conservative) Management - First Line
Suitable for all grades; essential for Grade I-II and as adjunct at all stages:
- Dietary fiber: 20-30 g/day; encourages soft stools and reduces straining
- Adequate fluid intake: 6-8 glasses of non-caffeinated, non-alcoholic beverages daily
- Avoid prolonged toilet sitting and straining
- Stool softeners: Docusate sodium; polyethylene glycol 3350 for constipation
- Topical agents: Phenylephrine/mineral oil/petrolatum or glucocorticoid creams for temporary relief of pain or itching (caution: steroids predispose to candidiasis with prolonged use)
- Sitz baths (warm)
- Phlebotonics (e.g., flavonoids such as diosmin): Improve venous tone, stabilize capillary permeability, useful for bleeding; excellent safety profile. Used especially for Grade II-III hemorrhoids failing fiber therapy.
2. Office Procedures (Non-excisional) - Grade I, II, III
Designed to affix the vascular cushion to the internal sphincter via scarring:
| Procedure | Notes |
|---|---|
| Rubber Band Ligation (RBL) | Most common office procedure; used for Grade II-III; bands placed above dentate line; bands MUST NOT be placed on squamous mucosa (causes pain) |
| Injection sclerotherapy | Chemical fixation |
| Infrared photocoagulation | Thermal fixation |
| Cryotherapy | Less commonly used |
| Bipolar/direct current electrocoagulation | Thermal fixation |
| Doppler-guided hemorrhoidal artery ligation | More recent technique |
RBL details: Bands placed just proximal (above) the internal hemorrhoid, above the dentate line. Entrapped tissue becomes necrotic and sloughs over days. Reassessment in 4-6 weeks; repeat as needed. Bands should NOT be applied to Grade IV (better suited for surgery) or external hemorrhoids.
3. Surgical Management - Grade IV / Failed Office Procedures
- Hemorrhoidectomy (excisional): Gold standard for Grade IV hemorrhoids and those failing non-excisional treatments
- Stapled hemorrhoidopexy (procedure for prolapse and hemorrhoids, PPH)
Complications
- Thrombosis - sudden, severe pain with a tender perianal lump (thrombosed external hemorrhoid); very common emergency presentation
- Strangulation - prolapsed internal hemorrhoid with loss of blood supply
- Anemia - rare; from chronic or recurrent bleeding
- Incarceration - irreducible prolapse
- Portal hypertension-related bleeding - more serious and ominous in this specific context
Key Distinguishing Points
- Hemorrhoids are part of normal anal anatomy; their mere presence does not indicate disease
- Pain alone without bleeding should raise suspicion for fissure or abscess, not hemorrhoids
- Hemorrhoids "elsewhere" (not at 3, 7, 11 o'clock) - think carcinoma, lymphoma, or condyloma
- Always exclude colorectal cancer in appropriate-age patients presenting with rectal bleeding, even if hemorrhoids are found
Sources:
- Sleisenger and Fordtran's Gastrointestinal and Liver Disease, pp. 2671-2672
- Robbins, Cotran & Kumar Pathologic Basis of Disease, p. 762
- Robbins & Kumar Basic Pathology, pp. 286-288
- Clinical Gastrointestinal Endoscopy (3e), p. 258
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