Understanding Your Diagnosis: An Introduction to IgAV
At a Glance
Immunoglobulin A Vasculitis (IgAV), formerly Henoch-Schönlein purpura (HSP), is blood vessel inflammation causing a raised purple rash, joint pain, and kidney issues. It usually resolves naturally in children but requires closer specialist monitoring in adults to protect kidney health.
If you or your child have recently been diagnosed with Immunoglobulin A Vasculitis (IgAV), you may feel overwhelmed by the sudden appearance of a purple rash and joint pain. It is important to know that while the symptoms can look alarming, they are the result of a specific immune process that doctors now understand better than ever before. This page will help you orient yourself to the condition, its new name, and what the typical journey looks like for both children and adults.
Understanding the Name Change
For over a century, this condition was known as Henoch-Schönlein purpura (HSP), named after the two doctors who first described it [1]. In recent years, the medical community officially renamed it Immunoglobulin A Vasculitis (IgAV) [1]. This change was made to more accurately reflect what is actually happening in the body: vasculitis (inflammation of the blood vessels) caused by an accumulation of Immunoglobulin A (IgA), a protein that normally helps the immune system fight infections [2].
The ‘Classic Tetrad’ of Symptoms
Doctors often look for a specific group of four symptoms, known as the Classic Tetrad, to identify IgAV [3]:
- Palpable Purpura: A mandatory sign for diagnosis, this is a purple-red rash that feels slightly raised when you touch it [3].
- Arthralgia: Joint pain or swelling, most commonly in the knees and ankles [3].
- Abdominal Pain: Often described as “colicky” or coming in waves, sometimes accompanied by nausea [3].
- Renal Involvement: Inflammation of the kidneys, which doctors monitor through urine tests to look for microscopic amounts of blood or protein [4].
(For a deeper dive into these symptoms and emergency warning signs, see Recognizing Symptoms and Warning Signs).
A Tale of Two Age Groups
IgAV behaves very differently depending on whether it begins in childhood or adulthood. While the symptoms are similar, the frequency and typical outlook vary significantly.
| Feature | Pediatric IgAV (Children) | Adult-Onset IgAV |
|---|---|---|
| Commonality | The most common form of vasculitis in children [5]. | Very rare in adults, officially classified as a rare disease [6]. |
| Typical Course | Usually self-limiting (resolves on its own) with an excellent long-term outlook [5]. | Often a more severe clinical course requiring closer specialist care, but highly manageable with prompt treatment [7]. |
| Kidney Risk | Kidney involvement is common but often mild; severe issues are rare [5]. | Significantly higher risk of severe kidney disease, especially after age 30 [8]. |
| Triggers | Often follows an upper respiratory infection (either viral or bacterial, such as Strep throat) [9]. | Can be triggered by infections, medications, or other underlying systemic conditions [10]. |
Grounding Facts for the Journey Ahead
When a diagnosis is new, it helps to focus on what is known and controllable.
- Most children recover fully. For the vast majority of pediatric patients, the disease resolves within a few weeks to months without any long-term health problems [5].
- Adults can achieve remission. While the adult path requires more aggressive monitoring and sometimes stronger medications, adult patients frequently achieve full remission and lead normal lives when working closely with specialists like Rheumatologists and Nephrologists [11].
- Monitoring is the key to safety. Because the kidneys are the most important factor in the long-term outlook, regular urinalysis (urine testing) is the standard of care to catch any changes early before they become serious problems [4].
Your next step is to understand exactly what symptoms to watch for day-to-day. Learn more in Recognizing Symptoms and Warning Signs.
Common questions in this guide
Why was the name changed from Henoch-Schönlein purpura (HSP) to IgAV?
What are the classic symptoms of IgAV?
Is IgAV different in adults compared to children?
How do doctors monitor for kidney problems in IgAV patients?
Questions to Ask Your Doctor
Curated prompts to bring to your next appointment.
- 1.Based on the 'Classic Tetrad,' which symptoms am I (or my child) currently showing?
- 2.Since IgAV is rare in adults, what specific symptoms should I watch for that might indicate a more severe course?
- 3.Does our current care plan follow established classification criteria, such as the EULAR or Ankara 2008 guidelines?
Questions For You
Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.
References
References (11)
- 1
Drug-Induced IgA Vasculitis in an Adult.
Yousif M, Vigil NH, Haddad R
Cureus 2023; (15(1)):e34270 doi:10.7759/cureus.34270.
PMID: 36855485 - 2
Predictive role of laboratory markers and clinical features for recurrent Henoch-Schönlein Purpura in childhood: A study from Turkey.
Gökçe Ş, Kurugöl Z, Koturoğlu G, Aslan A
Modern rheumatology 2020; (30(6)):1047-1052 doi:10.1080/14397595.2019.1690966.
PMID: 31711347 - 3
Lumbar swelling and migrating edema in 3- and 4-year-old boys.
Marcia M, Parodi E
SAGE open medical case reports 2022; (10()):2050313X221102112 doi:10.1177/2050313X221102112.
PMID: 35655711 - 4
An Unusual Case of Bilateral Lower Extremity Edema in the Elderly: Immunoglobulin A (IgA) Vasculitis.
Yanagihara T, Nakagawa T, Nishie H, et al.
Cureus 2023; (15(7)):e42684 doi:10.7759/cureus.42684.
PMID: 37529819 - 5
Henoch-Schönlein Purpura in Children: An Updated Review.
Leung AKC, Barankin B, Leong KF
Current pediatric reviews 2020; (16(4)):265-276 doi:10.2174/1573396316666200508104708.
PMID: 32384035 - 6
Clinical Characteristics of Biopsy-Proven IgA Vasculitis in Children and Adults: A Retrospective Cohort Study.
Villatoro-Villar M, Crowson CS, Warrington KJ, et al.
Mayo Clinic proceedings 2019; (94(9)):1769-1780 doi:10.1016/j.mayocp.2019.04.034.
PMID: 31486380 - 7
Clinical features, treatment and outcome of pediatric patients with severe cutaneous manifestations in IgA vasculitis: Multicenter international study.
Sestan M, Kifer N, Sozeri B, et al.
Seminars in arthritis and rheumatism 2023; (61()):152209 doi:10.1016/j.semarthrit.2023.152209.
PMID: 37126983 - 8
Adult Henoch-Schönlein purpura: Clinical and histopathological predictors of systemic disease and profound renal disease.
Cao R, Lau S, Tan V, Tey HL
Indian journal of dermatology, venereology and leprology 2017; (83(5)):577-582 doi:10.4103/ijdvl.IJDVL_571_16.
PMID: 28485308 - 9
Taxonomic and functional shifts of gut microbiome in immunoglobulin A vasculitis children and their mothers.
Liang Y, Zhao C, Zhao L, et al.
Frontiers in pediatrics 2024; (12()):1356529 doi:10.3389/fped.2024.1356529.
PMID: 38410769 - 10
Effectiveness of tocilizumab for IgA vasculitis associated with idiopathic multicentric Castleman's disease: Two cases and literature review.
Suzuki K, Saito K, Akiyama M, et al.
Modern rheumatology case reports 2026; (10(1)) doi:10.1093/mrcr/rxag014.
PMID: 41761774 - 11
Brief Report: Rituximab for the Treatment of Adult-Onset IgA Vasculitis (Henoch-Schönlein).
Maritati F, Fenoglio R, Pillebout E, et al.
Arthritis & rheumatology (Hoboken, N.J.) 2018; (70(1)):109-114 doi:10.1002/art.40339.
PMID: 28973844
This page provides an educational overview of Immunoglobulin A Vasculitis (IgAV) and its symptoms. Always consult your rheumatologist or nephrologist for personalized medical advice, diagnosis, and treatment planning.
Get notified when new evidence is published on Immunoglobulin A vasculitis.
We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.