Vasculitis

What is vasculitis?

Vasculitis is a group of conditions in which the body’s blood vessels become inflamed. Inflammation means the immune system — the body’s natural defense against infection — becomes active in a place where it is not needed, causing swelling, irritation, and sometimes damage to tissue. In vasculitis, this inflammation affects the walls of blood vessels: the arteries, veins, and tiny capillaries that carry blood throughout the body. When a vessel wall becomes inflamed, it can thicken, narrow, weaken, or scar. This can reduce blood flow to the organs and tissues that the vessel supplies, and in some cases blood flow can be blocked entirely.

Because blood vessels run through every part of the body, vasculitis can affect almost any organ, including the skin, kidneys, lungs, nerves, joints, eyes, and brain. Doctors group the many types of vasculitis mainly by the size of the vessels involved — large, medium, or small — and by the pattern of organs affected. Some forms, such as giant cell arteritis, mostly affect older adults, while others, such as Kawasaki disease and IgA vasculitis (also called Henoch-Schönlein purpura), occur mainly in children. Overall, vasculitis is uncommon, and it can affect people of any age, sex, or background.

Understanding what is vasculitis in simple terms comes down to this: it is inflammation of the blood vessels that can interfere with normal blood flow. Some forms are mild and limited to the skin; others are serious conditions that need prompt medical treatment to protect vital organs.

Symptoms of vasculitis

Vasculitis symptoms vary widely depending on which blood vessels are inflamed, how severe the inflammation is, and which organs are affected. Many people first notice general signs of inflammation that could be mistaken for an infection or another illness. Common general vasculitis symptoms include:

• Fever that has no obvious cause and may come and go
• Fatigue — persistent tiredness that does not improve with rest
• Unintended weight loss and loss of appetite
• Muscle and joint aches, sometimes with joint swelling
• Night sweats and a general feeling of being unwell

In addition to these general signs, symptoms often point to the specific organs involved:

• Skin: a rash of small red or purple spots (called purpura), lumps, open sores, or patches of skin discoloration, often on the lower legs
• Nerves: numbness, tingling, weakness, or shooting pain in the hands or feet
• Kidneys: often no symptoms at first, but blood or protein may appear in the urine, and blood pressure may rise
• Lungs: cough, shortness of breath, or coughing up blood
• Head and eyes: new headaches, scalp tenderness, jaw pain when chewing, blurred or double vision, or sudden vision loss (features seen in giant cell arteritis)
• Digestive system: abdominal pain, especially after eating, nausea, or blood in the stool
• Ears, nose, and sinuses: repeated sinus infections, nosebleeds, or hearing changes in some small-vessel types

Symptoms can also differ by stage. Early in the disease, general symptoms such as fever and fatigue often dominate, and the diagnosis may not be obvious. As inflammation continues, organ-specific symptoms tend to appear. Some types of vasculitis develop slowly over weeks or months, while others begin suddenly and progress quickly. Certain forms follow a pattern of flares — periods when symptoms worsen — followed by periods of remission, when symptoms improve or disappear. Because the picture is so variable, any combination of persistent unexplained symptoms deserves medical evaluation.

Causes and risk factors

In most cases, the exact cause of vasculitis is not known. Doctors believe that most forms are autoimmune, meaning the immune system mistakenly attacks the body’s own blood vessels instead of protecting them. Why this happens is not fully understood, but research points to a combination of genetic susceptibility and environmental triggers.

Recognized vasculitis causes and triggers include:

• Infections: some viral infections, such as hepatitis B and hepatitis C, are linked to specific types of vasculitis. Other infections may act as triggers in people who are already susceptible.
• Medications: certain drugs can trigger vasculitis in some people. This is often called drug-induced vasculitis, and it may improve when the medication is stopped under medical supervision.
• Other autoimmune diseases: conditions such as rheumatoid arthritis, lupus (systemic lupus erythematosus), and Sjögren’s syndrome can be associated with vasculitis.
• Certain cancers: in some cases, especially blood cancers, vasculitis can occur as an associated condition.
• Genetic factors: some types of vasculitis appear more often in people with particular genetic backgrounds, although vasculitis is not usually inherited in a direct way.

Risk factors vary by type. Age is important: giant cell arteritis almost always occurs in people over 50, while Kawasaki disease affects young children. Some forms are more common in one sex than the other, and smoking is strongly linked to a specific type called Buerger’s disease (thromboangiitis obliterans), which affects the blood vessels of the arms and legs. Having a risk factor does not mean a person will develop vasculitis, and many people who are diagnosed have no identifiable risk factor at all.

Diagnosis

Vasculitis diagnosis can be challenging because the symptoms overlap with many other conditions, including infections, clotting disorders, and other autoimmune diseases. Doctors usually combine a careful medical history, a physical examination, laboratory tests, imaging, and often a biopsy to confirm the diagnosis and identify the specific type.

Tests your doctor may use include:

• Blood tests: markers of inflammation such as the erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) are often elevated. A complete blood count may show anemia (low red blood cells). Specific antibody tests, such as ANCA (antineutrophil cytoplasmic antibodies), help identify certain small-vessel types of vasculitis. Kidney and liver function tests show whether these organs are affected.
• Urine tests: a urinalysis can detect blood or protein in the urine, which may signal kidney involvement even before symptoms appear.
• Biopsy: taking a small sample of tissue from an affected area — such as the skin, a kidney, a nerve, or the temporal artery in suspected giant cell arteritis — and examining it under a microscope is often the most reliable way to confirm vasculitis.
• Imaging: ultrasound, computed tomography (CT), magnetic resonance imaging (MRI), and specialized scans such as PET (positron emission tomography) can show inflammation or narrowing in medium and large vessels. Angiography — imaging of the blood vessels using contrast dye — may reveal characteristic changes in vessel shape.
• Other organ-specific tests: chest imaging for lung involvement, nerve conduction studies for nerve symptoms, or eye examinations, depending on the situation.

Doctors also use established classification criteria — standardized checklists developed by international rheumatology organizations — to help distinguish one type of vasculitis from another. Because treatment differs by type and severity, identifying the specific form of vasculitis matters. Vasculitis is typically managed by rheumatologists, specialists in autoimmune and inflammatory diseases, often working with kidney specialists, lung specialists, dermatologists, and other physicians depending on which organs are involved. At Acibadem, this condition is evaluated and managed within the Rheumatology Department, in coordination with other specialties as needed.

Treatment options

Vasculitis treatment depends on the type of vasculitis, which organs are affected, and how severe the inflammation is. The main goals are to bring the inflammation under control (a phase doctors call induction of remission), to keep it under control over time (maintenance), and to prevent or limit damage to organs. Treatment plans are individualized, and your medical team may adjust them over time based on your response and any side effects.

Watchful waiting

Some mild forms of vasculitis — for example, certain cases limited to the skin, or IgA vasculitis in children — may improve on their own. In these situations, doctors may recommend careful monitoring rather than immediate medication, with regular check-ups and urine tests to make sure the kidneys and other organs remain unaffected.

Medications

Medications are the mainstay of treatment for most types of vasculitis. Commonly used categories include:

• Corticosteroids: drugs such as prednisone reduce inflammation quickly and are often the first treatment. Because long-term steroid use can cause side effects — including weight gain, bone thinning, high blood sugar, and increased infection risk — doctors usually aim to lower the dose gradually once the disease is controlled.
• Immunosuppressants: medications that calm the overactive immune system, such as methotrexate, azathioprine, mycophenolate, or cyclophosphamide, are often added for more serious disease or to allow lower steroid doses.
• Biologic therapies: newer medications that target specific parts of the immune system, such as rituximab or tocilizumab, are used for certain types of vasculitis, particularly some ANCA-associated forms and giant cell arteritis.
• Treatment of an underlying cause: when vasculitis is linked to an infection such as hepatitis, treating the infection is a central part of the plan. If a medication is thought to be the trigger, it may be stopped or replaced under medical guidance.

Because these medicines lower the immune system’s activity, your doctor may also recommend steps to reduce infection risk, such as appropriate vaccinations and, in some cases, preventive antibiotics, along with medicines to protect bone health during steroid treatment.

Procedures and surgery

Most people with vasculitis do not need surgery, but procedures may be considered in specific situations. If inflammation has caused an artery to narrow significantly, a procedure to widen the vessel (angioplasty) or bypass surgery may be discussed. If vessel walls have weakened and formed an aneurysm — a bulge in the artery that can rupture — surgical repair may be needed. In some severe cases, a procedure called plasma exchange (plasmapheresis), which filters harmful antibodies from the blood, may be used alongside medication. Decisions about procedures are made case by case after specialist assessment.

You can find more information about how this condition is evaluated and treated on the vasculitis page.

Living with vasculitis and outlook

The outlook for vasculitis varies considerably by type and severity. Some forms are self-limited and resolve fully, especially in children. Many other forms are chronic conditions that can be brought into remission with treatment but may flare again over time. With modern medications, most people with vasculitis can achieve good disease control, although this often requires ongoing monitoring and, in many cases, long-term medication. Serious complications are possible if inflammation goes untreated, which is why early diagnosis and regular follow-up matter.

Practical steps that often help people live well with vasculitis include:

• Attending all scheduled follow-up visits and laboratory tests, since blood and urine tests can detect a flare or medication side effect before symptoms appear
• Taking medications exactly as prescribed and never stopping steroids suddenly without medical advice, because abrupt withdrawal can be harmful
• Learning your personal warning signs of a flare and reporting them promptly
• Not smoking, eating a balanced diet, staying physically active as your condition allows, and protecting bone health, especially during steroid treatment
• Keeping vaccinations up to date as recommended by your care team, since some treatments increase infection risk
• Seeking support for the emotional side of living with a chronic illness, whether from family, patient organizations, or mental health professionals

No doctor can guarantee a specific outcome, but in many cases people with vasculitis return to most of their normal activities once the disease is under control. Your care team can give you a more personalized picture based on your type of vasculitis, your organ involvement, and your response to treatment.

Frequently asked questions

What is vasculitis in simple terms?

Vasculitis means inflammation of the blood vessels. The immune system attacks the walls of arteries, veins, or capillaries, causing them to swell, narrow, or weaken. This can reduce blood flow to organs and tissues. There are many types, grouped mainly by the size of the vessels affected, and they range from mild skin-limited disease to serious conditions affecting vital organs.

Can vasculitis be cured or does it go away?

It depends on the type. Some forms, such as many childhood cases of IgA vasculitis, often resolve completely. Other forms are chronic and cannot currently be cured, but they can usually be brought into remission — a state where the disease is inactive — with medication. Some people remain in remission for years, while others experience flares that need renewed treatment. Your doctor can explain what is typical for your specific type.

How serious is vasculitis?

Severity varies greatly. Vasculitis limited to the skin is often mild, while types that affect the kidneys, lungs, heart, brain, or eyes can be serious and, if untreated, may cause permanent organ damage. With timely diagnosis and appropriate vasculitis treatment, outcomes have improved substantially, and most people can achieve good disease control. Prompt medical attention for new or worsening symptoms is important.

What are the first warning signs of vasculitis?

Early vasculitis symptoms are often nonspecific: unexplained fever, ongoing fatigue, weight loss, night sweats, and aching muscles or joints. More specific early signs can include a purple-spotted rash on the legs, numbness or tingling in the hands or feet, new persistent headaches with scalp tenderness in older adults, or blood in the urine found on testing. None of these symptoms proves vasculitis on its own, but persistent unexplained symptoms should be evaluated by a doctor.

What causes vasculitis to flare up?

Flares can happen without an obvious trigger. In some cases, infections, reducing or stopping medication too quickly, or significant physical stress may precede a flare. Because vasculitis causes and triggers are not fully understood, doctors focus on regular monitoring so that a flare can be detected and treated early, often through routine blood and urine tests even when you feel well.

How is vasculitis diagnosed?

Vasculitis diagnosis usually combines several steps: a detailed history and physical examination, blood tests for inflammation markers and specific antibodies such as ANCA, urine tests to check the kidneys, imaging such as ultrasound, CT, MRI, or angiography to look at the blood vessels, and often a biopsy of affected tissue. A biopsy — examining a small tissue sample under a microscope — is frequently the most definitive test.

Can you live a normal life with vasculitis?

Many people with vasculitis lead full, active lives once the disease is controlled, although this often requires ongoing medication and regular follow-up. Some people experience lasting effects from organ damage or medication side effects, so experiences vary. Working closely with a rheumatology team, taking treatment as prescribed, and reporting new symptoms early all improve the chances of maintaining a good quality of life.

When to see a doctor

See a doctor promptly if you have persistent unexplained symptoms such as ongoing fever, unintended weight loss, a new rash of red or purple spots, numbness or weakness in the hands or feet, or blood in your urine. If you have already been diagnosed with vasculitis, contact your care team whenever your usual symptoms return or worsen, or if you develop signs of infection while on immune-suppressing medication.

Seek urgent medical attention — including emergency care where appropriate — if you experience any of the following red-flag warning signs:

• Sudden vision changes or vision loss, especially with a new headache, scalp tenderness, or jaw pain when chewing in a person over 50
• Coughing up blood or sudden severe shortness of breath
• Chest pain or symptoms suggesting a heart problem
• Signs of a stroke, such as sudden weakness or numbness on one side of the body, facial drooping, difficulty speaking, or sudden confusion
• Severe abdominal pain, especially with vomiting or blood in the stool
• Rapidly spreading rash, skin ulcers, or areas of skin turning dark, which may signal severely reduced blood flow
• Little or no urine output, marked swelling of the legs or face, or visibly bloody urine
• High fever with shaking chills while taking immune-suppressing medication

These symptoms can indicate that vasculitis is affecting a vital organ or that a serious complication is developing. Early evaluation and treatment give the best chance of protecting organ function and health.