IgA Vasculitis: A Comprehensive Guide
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 24th, 2026.
Published on April 5th, 2026. Updated on August 28th, 2026.
Key Takeaways
IgA vasculitis is an autoimmune condition that causes inflammation of small blood vessels
It mainly affects children between ages 3-15, though adults can develop it too
The classic signs include a purple rash on legs and buttocks, joint pain, and stomach problems
Most cases resolve on their own within 4-6 weeks with supportive care
Kidney involvement requires close monitoring and may need specialized treatment
Overview
IgA vasculitis, also called Henoch-Schönlein purpura, is a type of blood vessel inflammation. It occurs when IgA-containing immune deposits collect in small blood vessels and trigger inflammation. The exact cause of this abnormal immune response is not fully understood. This causes the vessels to become swollen and leak blood into surrounding tissues.
The condition gets its name from IgA antibodies that build up in blood vessel walls. These antibodies are normally part of your body's defense system. The condition gets its name from IgA antibodies, which normally form part of the body's defense system but contribute to blood-vessel inflammation in IgA vasculitis.
IgA vasculitis is the most common type of vasculitis in children. About 20 out of every 100,000 children develop it each year. Boys are affected slightly more often than girls. While it can occur at any age, it's rare in adults over 65.
The good news is that many children recover completely without any long-term problems. Some people may have mild symptoms that come back from time to time. The condition is not contagious, so you cannot catch it from someone else or pass it to others.
Symptoms & Signs
IgA vasculitis symptoms often appear suddenly and can affect multiple body systems. The condition typically develops over days to weeks. Symptoms may come and go in episodes.
Primary Symptoms
Purple rash (purpura) - Small, dark red or purple spots that don't fade when pressed, usually on legs and buttocks
Joint pain and swelling - Most commonly affects knees and ankles, causing stiffness and difficulty walking
Abdominal pain - Cramping, nausea, vomiting, and sometimes bloody stools
Kidney problems - Blood or protein in urine, swelling around eyes or legs
When to Seek Care
Watch for signs that the condition is worsening or affecting vital organs. Severe abdominal pain, persistent vomiting, or significant kidney symptoms need prompt attention. The rash may spread to your arms, chest, and face as the condition progresses. Some people experience fever or feel very tired during flare-ups. Swelling in your hands, feet, or face could mean your kidneys need special attention.
When to Seek Immediate Care
Contact your healthcare provider right away if you notice blood in urine, severe stomach pain, persistent vomiting, or if the rash spreads rapidly.
Causes & Risk Factors
Age
Risk Factors and Possible Triggers
IgA vasculitis is most common in children ages 3-15, with peak occurrence around age 6.
Genetics
Family history may increase risk, though no specific genes identified
Lifestyle
Recent infections, especially respiratory tract infections
Other Conditions
History of frequent infections or autoimmune disorders
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Diagnosis of IgA Vasculitis
Diagnosis
Medical History & Physical Examination
Your doctor will ask about recent illnesses, medications, and when symptoms started. They'll examine your skin carefully, looking for the characteristic purple rash. The doctor will also check your joints for swelling and tenderness. They'll feel your abdomen for pain or tenderness and look for signs of kidney problems like swelling around your eyes.
Diagnostic Testing
Urine tests - Check for blood, protein, or other signs of kidney damage
Blood tests - Measure kidney function, look for signs of inflammation, and rule out other conditions
Skin biopsy - Takes a small sample of affected skin to confirm IgA deposits in blood vessels under a microscope
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Treatment Options
Treatment for IgA vasculitis focuses on managing symptoms and preventing complications. Most cases improve on their own without specific treatment.
Conservative Treatments
Rest and supportive care - Adequate rest helps your body heal and reduces joint stress
Pain relief - Over-the-counter pain medications like acetaminophen can help with joint pain and discomfort
Hydration and nutrition - Staying well-hydrated and eating a balanced diet supports recovery
Advanced Treatments
Corticosteroids - Prednisone may be prescribed for severe abdominal pain or joint symptoms
Immunosuppressive medications - Used when kidneys are significantly affected or symptoms are severe
Your doctor will decide which treatment is best based on how severe your symptoms are. If your kidneys are affected, you may need more intensive treatment to prevent lasting damage. Regular check-ups and blood tests help your doctor monitor how well the treatment is working.
Living with the Condition
Daily Management Strategies
Focus on gentle activities that don't stress your joints. Keep a symptom diary to track which activities make you feel better or worse. Stay in close contact with your healthcare team, especially if you have kidney involvement. Monitor your blood pressure regularly if you have kidney problems, as this can be an early sign of complications.
Eat nutritious meals and drink enough fluids unless your healthcare professional has advised fluid restrictions because of kidney problems. Protect your skin from injury, especially areas affected by the rash. Get plenty of sleep and manage stress, as these help your immune system recover.
Exercise & Movement
Light activities like walking or swimming are usually safe during recovery. Avoid high-impact sports or activities that could stress swollen joints. Listen to your body and rest when you feel tired. Gentle stretching can help maintain joint flexibility. As symptoms improve, gradually return to normal activities with your doctor's guidance.
Return to school or work slowly as you feel better. Ask your teacher or boss about taking breaks if you get tired easily. Wear comfortable shoes and loose clothing that won't irritate your skin.
Prevention
Treat infections promptly to reduce the risk of immune system overreaction
Maintain good hygiene to prevent respiratory and other infections that can trigger vasculitis
Avoid known triggers if you've had IgA vasculitis before, such as certain medications or extreme cold
Stay up-to-date with vaccinations to prevent serious infections that might trigger the condition
Wash your hands frequently, especially during cold and flu season. Keep wounds clean and covered to prevent infection. Avoid being around people who are sick whenever possible. Dress warmly during cold weather to prevent exposure to extreme temperatures.
Frequently Asked Questions
Most people recover completely and never have another episode. However, about 30% of people may have mild recurring symptoms. Kidney involvement can develop without obvious symptoms, even after the rash and joint or stomach symptoms improve. Follow-up should include regular urine tests and blood-pressure checks for the period recommended by your healthcare professional, often for at least 6 months.
Can adults develop IgA vasculitis?
Yes, though it's much less common in adults. Adult cases tend to be more severe and are more likely to involve kidney problems. Adults may need more aggressive treatment and closer monitoring than children.
No, IgA vasculitis itself is not contagious. However, the infections that sometimes trigger it can be contagious. The condition results from your immune system's response, not from a virus or bacteria that spreads between people.
The characteristic purple rash typically lasts 2-4 weeks. It may come and go in waves during this time. The rash usually fades completely without leaving permanent marks or scars.
There are no specific dietary restrictions for IgA vasculitis. However, if you have kidney involvement, your doctor may recommend limiting salt or protein. Focus on a balanced diet with plenty of fluids to support your recovery and overall health.
Still have questions?
Consult with a healthcare professional for personalized advice.