Internal Hemorrhoids - Symptoms, Causes, Treatment & Prevention

📅 Updated: June 2026 ⏱️ 6 min read ✅ Medically reviewed
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Internal Hemorrhoids – A Comprehensive Medical Guide

Overview

Internal hemorrhoids are swollen vascular cushions located inside the rectum, above the dentate line. Unlike external hemorrhoids, they are not visible from the outside and are usually painless because the rectal mucosa lacks somatic (pain) nerves.

They affect both men and women, with prevalence increasing with age. Population‑based studies estimate that up to 50% of adults will develop hemorrhoids at some point in their lives (Mayo Clinic, 2023). About 25% of those experience symptoms that lead them to seek medical care.

While most internal hemorrhoids are benign, they can cause bleeding, prolapse, and, in rare cases, thrombosis or strangulation that requires prompt treatment.

Symptoms

Symptoms vary depending on the grade (I‑IV) of the hemorrhoid. Below is a complete list with brief explanations:

  • Rectal bleeding: Bright red blood on toilet paper, in the stool, or in the toilet bowl. Bleeding is usually painless.
  • Prolapse (bulging): The hemorrhoid can slide out of the anal canal during bowel movements.
  • Itching or irritation: Caused by mucus discharge or mild irritation from prolapsed tissue.
  • Feeling of incomplete evacuation: The presence of the hemorrhoid can make it feel like you haven’t fully emptied the bowels.
  • Swelling or a lump: May be felt during a digital rectal exam; patients may notice a soft, painless bulge.
  • Thrombosis (rare for internal hemorrhoids): Sudden, severe pain if a clot forms within a prolapsed hemorrhoid, turning it into a hard lump.
  • Discomfort during prolonged sitting: Pressure on the pelvic floor can accentuate symptoms.

Causes and Risk Factors

Primary Causes

  • Increased venous pressure in the rectal plexus: Straining during bowel movements, chronic constipation, or diarrhea can raise pressure.
  • Pregnancy: The enlarged uterus compresses pelvic veins; hormonal changes also relax the vascular wall.
  • Obesity: Excess abdominal weight adds pressure to the rectal veins.

Risk Factors

  • Age > 45 years (elasticity of supporting tissue decreases)
  • Low‑fiber diet leading to hard stools
  • Chronic constipation or prolonged sitting on the toilet
  • Heavy lifting or repeated Valsalva maneuvers (e.g., weightlifting, coughing)
  • Pregnancy and the first 6 weeks postpartum
  • Anal intercourse (increased mechanical trauma)
  • Family history of hemorrhoidal disease
  • Portal hypertension (cirrhosis) – can cause secondary internal hemorrhoids

Diagnosis

Most internal hemorrhoids are diagnosed clinically, but a systematic approach helps rule out other sources of rectal bleeding.

History and Physical Exam

  • Detailed bowel habit questionnaire (frequency, stool consistency, straining)
  • Review of bleeding characteristics (amount, timing, associated symptoms)
  • Digital rectal examination (DRE) to palpate internal cushions
  • Visual inspection of the anal canal with an anoscope or a proctoscope if prolapse is suspected

Special Tests (when indicated)

  • Anoscopy/Proctoscopy: Direct visualization; allows grading of hemorrhoids (I‑IV).
  • Flexible sigmoidoscopy or colonoscopy: Recommended for patients >50 years, with a family history of colorectal cancer, or when bleeding is atypical—to exclude malignancy or polyps.
  • Digital rectal ultrasound: Rarely used; helpful for complex or recurrent disease.

Treatment Options

Treatment is individualized, based on symptom severity, hemorrhoid grade, and patient preference.

Conservative Measures (First‑line)

  • Dietary fiber increase: Aim for 25–35 g/day (fruits, vegetables, whole grains, psyllium). Fiber softens stool and reduces straining.
  • Hydration: At least 8 ‑ 10 glasses of water daily.
  • Bathroom habits: Avoid prolonged sitting; respond to the urge to defecate promptly; limit toilet time to < 5 minutes.
  • Topical agents:
    • Over‑the‑counter (OTC) hemorrhoidal creams containing witch hazel, hydrocortisone 0.5% or lidocaine for itching/irritation.
    • Suppositories (e.g., phenylephrine) to reduce swelling.

Medical Therapy

  • Oral stool softeners: Docusate sodium 100 mg BID.
  • Fiber supplements: Psyllium husk 5 g mixed with water or juice, taken twice daily.
  • Tri‑mix suppositories: Combination of hydrocortisone, anesthetic, and a vasoconstrictor; limited to 2‑3 weeks to avoid mucosal thinning.

Office‑Based Procedures (Grades II‑IV or refractory symptoms)

  • Rubber band ligation (RBL): A small elastic band is placed around the base of the hemorrhoid, cutting off blood flow. Success rates 85‑95% for grades I‑III.
  • Infrared coagulation (IRC): Heat energy causes fibrosis and reduces hemorrhoidal tissue.
  • Sclerotherapy: Injection of a sclerosant (e.g., phenol in oil) induces fibrosis.

Surgical Options (Usually for Grade IV or when minimally invasive techniques fail)

  • Hemorrhoidectomy (excisional surgery): Removal of hemorrhoidal tissue; highest cure rate (>95%) but associated with postoperative pain.
  • Stapled hemorrhoidopexy (Procedure for Prolapse and Hemorrhoids – PPH): Removes a ring of redundant mucosa, lifts prolapsed tissue. Faster recovery, less pain, but higher recurrence in some series.
  • Doppler‑guided transanal hemorrhoidal dearterialization (THD): Uses an ultrasonic Doppler to locate feeding arteries and ligates them. Minimal postoperative discomfort.

When to Consider Referral

If bleeding is heavy, persistent despite conservative therapy, or if there are signs of anemia, a gastroenterology or colorectal surgery referral is warranted.

Living with Internal Hemorrhoids

Effective self‑management can dramatically improve quality of life.

  • Maintain a high‑fiber diet: Keep a food diary until you find a sustainable intake.
  • Exercise regularly: 30 minutes of moderate activity (walking, swimming) most days reduces constipation.
  • Use a squat‑type toilet footstool: Aligns the anorectal angle, facilitating easier bowel movements.
  • Warm sitz baths: 10‑15 minutes, 2‑3 times daily during flare‑ups can relieve discomfort.
  • Monitor stool consistency: Aim for a Bristol Stool Chart type 3–4. Adjust fiber or stool softeners accordingly.
  • Weight management: Even modest weight loss (5–10% of body weight) can lower intra‑abdominal pressure.
  • Limit use of irritants: Avoid excessive caffeine, alcohol, and spicy foods if they worsen symptoms.

Keeping a symptom log (bleeding episodes, pain level, bowel habits) helps your healthcare provider gauge treatment effectiveness.

Prevention

Preventive strategies target the root causes of increased venous pressure.

  1. Fiber‑rich diet: 25‑35 g/day; include beans, lentils, berries, and whole‑grain breads.
  2. Stay hydrated: Fluid helps fiber work efficiently.
  3. Regular physical activity: Reduces constipation and helps maintain healthy weight.
  4. Avoid prolonged sitting: Stand up and walk briefly every hour, especially during long work periods.
  5. Healthy bowel habits: Respond to the urge promptly; avoid straining.
  6. Pregnancy‑specific measures: Engage in prenatal pelvic floor exercises and discuss constipation management with your obstetrician.
  7. Limit heavy lifting: Use proper body mechanics; if you must lift, exhale on effort rather than holding breath.

Complications

If left untreated or poorly managed, internal hemorrhoids can lead to the following:

  • Chronic anemia: Ongoing occult bleeding may lower hemoglobin, especially in elderly patients.
  • Prolapse (Grade IV): The hemorrhoid remains outside the anal verge, leading to edema, irritation, and possible thrombosis.
  • Thrombosed hemorrhoid: Although more common in external disease, an internal hemorrhoid that prolapses can develop a clot, causing severe pain.
  • Strangulation: A prolapsed hemorrhoid can become trapped, cutting off its blood supply—this is a surgical emergency.
  • Infection: Rare, but necrotic tissue can become a nidus for bacterial growth.

When to Seek Emergency Care

Call 911 or go to the nearest emergency department immediately if you experience any of the following:
  • Sudden, profuse rectal bleeding that soaks through one or more pads or clogs the toilet.
  • Severe, sharp anal or rectal pain that does not improve with over‑the‑counter measures.
  • Signs of shock: dizziness, fainting, rapid heartbeat, pale skin, or feeling unusually weak.
  • Visible prolapsed tissue that is dark, hard, and cannot be reduced back inside the anal canal.
  • Fever, chills, or worsening abdominal pain suggesting infection.

These symptoms may indicate a strangulated or thrombosed hemorrhoid, significant blood loss, or another acute gastrointestinal problem that requires urgent evaluation.

References

  • Mayo Clinic. “Hemorrhoids.” Updated 2023. https://www.mayoclinic.org
  • Cleveland Clinic. “Hemorrhoids: Diagnosis and Treatment.” 2022. https://my.clevelandclinic.org
  • National Institutes of Health – National Institute of Diabetes and Digestive and Kidney Diseases. “Hemorrhoids.” 2021. https://www.niddk.nih.gov
  • American College of Gastroenterology. “Guideline for the Management of Hemorrhoids.” 2020. https://gi.org
  • World Health Organization. “Global Health Estimates 2022.” (Provides population data for prevalence calculations.)
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⚠️ Medical Disclaimer

Important: The information provided on this page is for general informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

If you think you may have a medical emergency, call your doctor, go to the emergency department, or call 911 immediately.

📚 Medical References