Henoch–Schönlein Purpura - Symptoms, Causes, Treatment & Prevention

📅 Updated: May 2026 ⏱️ 6 min read ✅ Medically reviewed
```html Henoch–Schönlein Purpura – Comprehensive Medical Guide

Henoch–Schönlein Purpura (HSP) – A Complete Patient Guide

Overview

Henoch–Schönlein Purpura (HSP), also called IgA vasculitis, is an immune‑mediated small‑vessel vasculitis that most commonly presents with a characteristic rash, joint pain, abdominal discomfort, and kidney involvement. It is the most frequent form of systemic vasculitis in children.

  • Typical age: 3–15 years (≈ 90 % of cases occur in children). Adults account for 10–20 % of cases and often have a more severe renal course.
  • Gender: Slight male predominance (≈ 1.5 : 1).
  • Incidence: 10–20 per 100,000 children per year in North America and Europe; lower rates are reported in Asia and Africa (CDC, Mayo Clinic).
  • Prognosis: Most children recover completely within weeks to months. Up to 30 % develop some degree of kidney involvement, and 1–2 % progress to chronic kidney disease.

Symptoms

HSP is a multisystem disease; symptoms may appear simultaneously or evolve over days.

Skin (Purpura)

  • Appearance: Non‑blanching, raised purple spots (purpura) or bruises.
  • Distribution: Primarily on the buttocks, thighs, and lower legs; may spread to the arms, trunk, and face.
  • Timing: Usually the first sign, appearing 2–5 days after a triggering infection.

Joint Involvement

  • Arthralgia or arthritis, most often affecting knees and ankles.
  • Swelling and warmth without permanent joint damage.
  • Joint symptoms usually resolve within 1–2 weeks.

Gastrointestinal Tract

  • Abdominal pain (cramping, colicky) – may be severe.
  • Nausea, vomiting, or loss of appetite.
  • Bloody stools or melena (indicative of intestinal hemorrhage).
  • Intussusception (telescoping of bowel) – a surgical emergency in rare cases.

Renal (Kidney) Manifestations

  • Hematuria (blood in urine) – often the first sign of kidney involvement.
  • Proteinuria (protein in urine); may be light (microscopic) or heavy (nephrotic range).
  • Hypertension, edema, or reduced kidney function in severe cases.

Other Possible Features

  • Fever (low‑grade).
  • Testicular pain or scrotal swelling (particularly in males).
  • Rare neurologic involvement – headache, seizures, or peripheral neuropathy.

Causes and Risk Factors

The exact cause of HSP is unknown, but it is thought to be an abnormal immune response that leads to deposition of IgA‑containing immune complexes in small vessels.

Common Triggers

  • Upper respiratory infections: Streptococcus, Staphylococcus, parainfluenza, and adenovirus are the most frequently implicated (NIH).
  • Gastrointestinal infections: Campylobacter, Salmonella, and rotavirus.
  • Vaccinations: Rarely reported after influenza or hepatitis B vaccines.
  • Medications: Antibiotics (e.g., penicillins, sulfonamides) and non‑steroidal anti‑inflammatory drugs (NSAIDs) have been implicated in isolated case reports.

Risk Factors

  • Age 3–15 years (children have the highest susceptibility).
  • Recent infection (within 2–4 weeks).
  • Genetic predisposition – certain HLA‑DQ haplotypes (e.g., HLA‑DQ1) are over‑represented.
  • Existing IgA deficiency or other immune dysregulation.

Diagnosis

There is no single test that definitively diagnoses HSP; clinicians rely on a combination of clinical criteria and targeted investigations.

Clinical Diagnostic Criteria

The most widely used criteria (the 1990 American College of Rheumatology criteria) require palpable purpura plus at least one of the following:
  • Age ≤ 20 years at disease onset.
  • Acute abdominal pain.
  • Biopsy showing IgA deposition in small vessels.
  • Arthritis or arthralgia.

Laboratory Tests

  • Urinalysis: Detects hematuria, proteinuria, or red‑cell casts.
  • Serum creatinine & eGFR: Baseline kidney function.
  • Complete blood count (CBC): May show mild anemia or leukocytosis.
  • ESR/CRP: Inflammatory markers often elevated.
  • Serum IgA level: Can be normal or mildly elevated; not diagnostic.
  • Complement levels (C3, C4): Usually normal, helping to differentiate from other vasculitides.

Imaging & Special Studies

  • Skin or renal biopsy: Direct immunofluorescence revealing IgA deposition confirms the diagnosis, often reserved for atypical cases.
  • Abdominal ultrasound: Evaluates for intussusception or bowel wall thickening.
  • Renal ultrasound: Baseline assessment if kidney involvement is suspected.

Treatment Options

Most cases of HSP in children are self‑limiting and require only supportive care. Treatment is tailored to organ involvement and severity.

Supportive Care

  • Rest and adequate hydration.
  • Analgesics for joint pain – acetaminophen is preferred; NSAIDs can be used cautiously if renal function is normal.
  • Topical soothing agents for skin lesions (e.g., calamine lotion).

Pharmacologic Therapy

  • Corticosteroids: Oral prednisone (1–2 mg/kg/day) is indicated for severe abdominal pain, significant renal disease, or extensive skin involvement. Evidence suggests faster resolution of pain but no clear impact on long‑term kidney outcomes (Cleveland Clinic).
  • Immunosuppressants: In patients with persistent nephritis, agents such as azathioprine, mycophenolate mofetil, or cyclophosphamide may be added under nephrology guidance.
  • ACE inhibitors or ARBs: Initiated when proteinuria or hypertension is present to protect renal function.
  • Tranexamic acid: Occasionally used for severe gastrointestinal bleeding, though data are limited.

Procedural Interventions

  • Intussusception: Requires urgent radiologic (air or contrast enema) or surgical reduction.
  • Renal biopsy: Performed when atypical or rapidly progressive kidney disease is suspected to guide immunosuppressive therapy.

Lifestyle & Home Measures

  • Maintain a balanced diet; increase fluid intake to support kidney health.
  • Elevate legs briefly to reduce joint swelling.
  • Avoid strenuous activity while joint pain or abdominal discomfort is present.

Living with Henoch–Schönlein Purpura

While the acute phase can be uncomfortable, most children return to normal activities within weeks. Below are practical tips for patients, families, and caregivers.

  • Track urine: Use a simple dip‑stick at home weekly for the first 3 months to catch early signs of hematuria or proteinuria.
  • School accommodations: Inform teachers about the possibility of joint pain or abdominal cramps; allow short rest periods.
  • Skin care: Keep the rash clean and dry; avoid scratching to reduce secondary infection risk.
  • Follow‑up schedule: Pediatrician or nephrologist visits at 2 weeks, 1 month, and then every 3 months for the first year, even if symptoms have resolved.
  • Vaccinations: Routine immunizations are safe; discuss timing with the physician if a severe flare is recent.
  • Emotional support: Explain the illness in age‑appropriate language; reassure that most children recover fully.

Prevention

Because HSP is triggered by an abnormal immune response rather than a contagious pathogen, primary prevention is limited. However, risk reduction strategies include:

  • Prompt treatment of upper respiratory and gastrointestinal infections.
  • Good hand hygiene to limit spread of common bacterial/viral triggers.
  • Avoiding unnecessary antibiotic use, which can alter immune balance.
  • Maintaining up‑to‑date vaccinations to reduce severe infections that might precipitate HSP.

Complications

Most patients recover without lasting effects, but clinicians monitor for the following complications:

  • Renal disease: Persistent hematuria, proteinuria, or progressive glomerulonephritis. Chronic kidney disease develops in ≈ 1–2 % of children and up to 10 % of adults.
  • Gastrointestinal bleeding: May require transfusion or endoscopic therapy.
  • Intussusception: Occurs in 2–5 % of pediatric cases; emergent reduction is required.
  • Neurologic involvement: Rare, but seizures or peripheral neuropathy can occur.
  • Testicular involvement: Pain or swelling that mimics torsion—requires urgent urologic evaluation.

When to Seek Emergency Care

Immediate medical attention is required if any of the following occur:
  • Severe, worsening abdominal pain or vomiting that does not improve.
  • Visible blood in vomit or stool, or black/tarry stools (melena).
  • Sudden swelling and tenderness in the scrotum or testicles.
  • Rapidly rising blood pressure, swelling of the face or legs, or a decrease in urine output.
  • Shortness of breath, chest pain, or signs of severe anemia (pale skin, dizziness).
  • Sudden loss of vision or neurological changes such as severe headache, confusion, or seizures.
Call 911 or go to the nearest emergency department right away.

References

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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