Henoch-Schonlein purpura (HSP) is a rare, small-vessel vasculitis that is characterized by inflammation of the blood vessels in the skin, joints, kidneys, and gastrointestinal tract. HSP is most commonly seen in children between the ages of 2 and 11 years old, but it can also occur in adults.

Pathophysiology

The exact cause of HSP is unknown, but it is thought to be triggered by an immune response to an infection, such as a cold or flu. When the immune system overreacts, it produces antibodies that attack the blood vessels, causing them to become inflamed and leak. This inflammation can lead to a number of symptoms, including:

• A rash of small, red or purple spots on the skin
• Joint pain and swelling
• Abdominal pain
• Nausea and vomiting
• Blood in the urine or stool

Epidemiology

HSP is a relatively common disease, with an estimated incidence of 1 to 5 cases per 100,000 children per year. It is more common in boys than girls, and it tends to occur in the spring or fall. HSP is most common in North America and Europe, but it can also be found in other parts of the world.

Risk Factors

There are a number of factors that can increase the risk of developing HSP, including:

• Family history: HSP tends to run in families, so if you have a family member who has the disease, you are more likely to develop it yourself.
• Certain infections: HSP is often triggered by infections, such as a cold or flu.
• Medications: Some medications, such as aspirin and ibuprofen, can increase the risk of HSP.
• Environmental factors: Exposure to certain environmental toxins, such as lead or mercury, can also increase the risk of HSP.

Diagnosis

The diagnosis of HSP is based on a combination of symptoms, physical examination findings, and laboratory tests. Blood tests may show evidence of inflammation, and a urine test may show blood or protein in the urine. A skin biopsy may also be done to confirm the diagnosis.

Treatment

There is no cure for HSP, but the symptoms can be managed with medication. Treatment may include:

• Nonsteroidal anti-inflammatory drugs (NSAIDs): NSAIDs, such as ibuprofen or naproxen, can help to reduce inflammation and pain.
• Corticosteroids: Corticosteroids, such as prednisone, can be used to suppress the immune system and reduce inflammation.
• Immunosuppressive drugs: Immunosuppressive drugs, such as azathioprine or cyclophosphamide, may be used in severe cases of HSP.

Prognosis

The prognosis for HSP is generally good. Most children with HSP will recover completely within a few weeks or months. However, some people may experience long-term complications, such as kidney damage or high blood pressure.

Frequently Asked Questions

1. What is the most common symptom of HSP?

The most common symptom of HSP is a rash of small, red or purple spots on the skin.

2. Who is most likely to get HSP?

HSP is most commonly seen in children between the ages of 2 and 11 years old, but it can also occur in adults. It is more common in boys than girls.

3. What causes HSP?

The exact cause of HSP is unknown, but it is thought to be triggered by an immune response to an infection, such as a cold or flu.

4. How is HSP diagnosed?

The diagnosis of HSP is based on a combination of symptoms, physical examination findings, and laboratory tests.

5. How is HSP treated?

There is no cure for HSP, but the symptoms can be managed with medication. Treatment may include NSAIDs, corticosteroids, or immunosuppressive drugs.