HSP (IgA Vasculitis) in Children
Content reviewed against published AAP, NIH, ACR, Mayo Clinic guidelines
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Henoch-Schönlein Purpura (HSP), now formally called IgA vasculitis, is the most common vasculitis in children. It is characterized by inflammation of small blood vessels (small-vessel vasculitis) caused by deposition of IgA immune complexes. The classic tetrad includes palpable purpura (non-blanching rash predominantly on the legs and buttocks), arthritis or joint pain, abdominal pain, and kidney involvement (nephritis). HSP most commonly affects children aged 3-10 years and often follows an upper respiratory infection. While usually self-limited, kidney involvement requires monitoring as it can occasionally cause long-term damage.
Key takeaways
- Henoch-Schönlein Purpura (HSP), now formally called IgA vasculitis, is the most common vasculitis in children.
- Duration: Most cases resolve within 4-6 weeks. Joint symptoms typically resolve within days to 2 weeks without permanent damage. Rash may wax and wane over several weeks. Abdominal pain usually resolves within 1-2 weeks. Kidney involvement may persist for weeks to months and requires follow-up for up to 12 months. Recurrence occurs in about one-third of children, usually within the first 3 months.
- Go to ER if: Severe abdominal pain that is persistent and worsening (concern for intussusception)
- No vaccine currently available
Symptoms
How It Presents by Age
0-2 years
HSP is uncommon in this age group but does occur. Presentation may be atypical with more prominent facial and upper extremity purpura. Diagnosis can be challenging as the classic tetrad may not be fully present. Kidney involvement is less common but intussusception risk exists.
Risk level: Moderate — atypical presentation may delay diagnosis
2-5 years
Common age for HSP onset. Classic palpable purpura on legs, buttocks, and sometimes arms. Joint pain (arthralgia) causes limping or refusal to walk. Abdominal pain may precede the rash by days, making initial diagnosis difficult. Intussusception is a recognized complication.
Risk level: Moderate — generally self-limited but monitor kidneys
5-10 years
Peak age group. Full classic presentation with purpura, arthritis, abdominal pain, and renal involvement. Joint swelling is often dramatic but resolves without permanent damage. Abdominal pain can mimic surgical emergencies. Renal involvement occurs in 20-50% but is usually mild.
Risk level: Moderate — kidney involvement requires monitoring
10+ years
Less common but tends to have more severe kidney involvement when it occurs. Older children and adolescents are more likely to develop persistent nephritis. Purpura may be more widespread. Extended follow-up of renal function is particularly important in this group.
Risk level: Moderate to high — greater risk of significant nephritis
Treatment
Supportive care
Most cases are self-limited and resolve within 4-6 weeks. Treatment focuses on pain management with acetaminophen or ibuprofen (though NSAIDs should be used cautiously if renal involvement is present), adequate hydration, and rest.
Corticosteroids
Oral prednisone (1-2 mg/kg/day for 1-2 weeks with taper) may be used for severe abdominal pain, significant joint pain, scrotal involvement, or soft tissue edema. Evidence supports early use for reducing GI complications. Not proven to prevent nephritis.
Renal monitoring
Urinalysis and blood pressure monitoring at diagnosis and weekly for the first 1-2 months, then monthly for 6-12 months. Persistent hematuria or proteinuria requires nephrology referral.
Treatment of nephritis
If significant nephritis develops (nephrotic-range proteinuria, impaired renal function), treatment may include high-dose corticosteroids, ACE inhibitors, and in severe cases, immunosuppressive agents (azathioprine, mycophenolate) under nephrology guidance.
Surgical consultation
Required if intussusception is suspected (severe colicky abdominal pain, currant jelly stool, abdominal mass). May also be needed to rule out other surgical emergencies like appendicitis or testicular torsion.
Home Care
- Encourage rest, especially during the acute phase when joints are painful
- Elevate swollen legs and joints to reduce edema
- Give acetaminophen for pain as directed by the doctor
- Ensure adequate fluid intake to support kidney function
- Monitor urine for visible blood or dark/tea-colored changes
- Avoid strenuous activity until symptoms resolve
- Keep a symptom diary to track rash recurrence and joint symptoms
When to Worry
Go to the ER if:
- Severe abdominal pain that is persistent and worsening (concern for intussusception)
- Large amount of blood in stool (currant jelly stool)
- Child is unable to keep fluids down due to vomiting
- Severe scrotal pain and swelling (must rule out testicular torsion)
- Signs of kidney failure — decreased urine output, significant swelling, elevated blood pressure
- Child appears very unwell with widespread purpura and lethargy
- Headache with altered consciousness (rare CNS involvement)
Call your doctor if:
- New non-blanching rash appearing on legs and buttocks
- Joint pain and swelling with rash
- Abdominal pain with rash
- Dark, tea-colored, or bloody urine
- Blood in stool
- Symptoms recurring after initial improvement
- Facial or extremity swelling
Keep an eye on:
- Rash is spreading or getting worse despite being told it is HSP
- Severe abdominal pain that is getting worse
- Blood visible in stool or urine
- Child is unable to walk due to joint pain and swelling
- Scrotal pain and swelling in boys
- Swelling of face or extremities is worsening
- Symptoms return after initial improvement (recurrence occurs in about one-third of cases)
Prevention
- There is no known way to prevent HSP
- Prompt treatment of streptococcal pharyngitis may reduce one potential trigger
- Early recognition of symptoms allows for timely monitoring of kidney function
- Long-term urinalysis follow-up (6-12 months) catches late-developing nephritis
- Educate families about the one-third recurrence rate so they can seek care promptly
Contagion & Incubation
Incubation
Not applicable — HSP is not an infectious disease. Symptoms typically develop 1-3 weeks after a triggering infection (most commonly upper respiratory). The condition can develop without an identifiable trigger.
Contagious for
Not contagious. HSP is an immune-mediated condition.
Duration
Most cases resolve within 4-6 weeks. Joint symptoms typically resolve within days to 2 weeks without permanent damage. Rash may wax and wane over several weeks. Abdominal pain usually resolves within 1-2 weeks. Kidney involvement may persist for weeks to months and requires follow-up for up to 12 months. Recurrence occurs in about one-third of children, usually within the first 3 months.
Frequently asked questions
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Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
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Bottom line
HSP (IgA Vasculitis) in Children is treatable with appropriate medical care. Seek emergency care if severe abdominal pain that is persistent and worsening (concern for intussusception).
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.