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Overview

What Is Vasculitis?

Vasculitis is inflammation of one or more blood vessels. Swelling can narrow or block blood flow, affecting tissues and organs supplied by those vessels. Vasculitis is a group of distinct conditions rather than one single disease, and it may affect children or adults. Some forms are limited to one area, while others cause systemic vasculitis throughout the body.

Symptoms

Vasculitis Symptoms

Vasculitis symptoms vary according to the size and location of the affected blood vessels and the organ involved. Symptoms may develop gradually or appear suddenly, and small vessel vasculitis can look different from forms affecting larger arteries.

  • Purple or red spots on the skin may occur as purpura, especially on the lower legs.
  • Numbness, tingling, or weakness can result from nerve inflammation called neuropathy.
  • Blood in the urine (hematuria) may signal kidney involvement.
  • Shortness of breath may occur when inflammation affects the lungs.
  • Ongoing congestion, nosebleeds, or facial pressure may cause sinus symptoms.
  • Blurred vision, eye pain, or other vision changes can occur when eye blood vessels are affected.
  • Joint pain or swelling may accompany inflammation in the tissues around a joint.
  • Fever may occur as part of the body’s general inflammatory response.
  • Unexplained tiredness or weight loss may occur with more widespread inflammation.

SEEK URGENT CARE

Symptoms that need prompt attention

Sudden vision loss, severe breathing difficulty, new weakness, chest pain, or confusion requires urgent medical evaluation. These symptoms may indicate serious organ or blood-vessel involvement.

Causes

Vasculitis Causes

Vasculitis often develops when immune cells mistakenly attack blood-vessel walls. This can cause swelling, narrowing, blockage, or weakening of the vessels, reducing blood flow to nearby tissues. The exact cause is often unknown, although some cases are linked to another illness, infection, or medicine. This immune-driven process is sometimes called autoimmune vasculitis.

  • Autoimmune diseases such as lupus or rheumatoid arthritis can be associated with vasculitis.
  • Some bacterial, viral, or other infections may trigger inflammation of blood vessels.
  • Certain medicines can cause a reaction linked to hypersensitivity vasculitis.
  • Allergic or immune reactions may inflame small blood vessels in the skin or other tissues.
  • Cancer rarely occurs alongside or contributes to a vasculitis-like inflammatory process.

Risk Factors

Risk Factors for Vasculitis

  • Having another autoimmune disease, such as lupus or rheumatoid arthritis, may increase the likelihood of vasculitis.
  • Certain infections are associated with particular vasculitis types.
  • Exposure to a medicine or chemical linked with an immune reaction may raise risk in some people.
  • A family history or inherited genetic tendency may contribute to susceptibility.
  • Smoking may worsen vascular inflammation or risk in some vasculitis subtypes.
  • Age and sex patterns vary by subtype, with some forms more common in children and others in adults.
  • Previous episodes of autoimmune inflammatory vasculitis may increase the chance of recurrence.

Complications

Vasculitis Complications

  • Severe kidney inflammation can lead to reduced kidney function or kidney failure.
  • Inflammation or bleeding in the lungs can cause serious breathing problems or lung bleeding.
  • Nerve damage may cause lasting numbness, pain, or weakness.
  • Blood-vessel inflammation involving the eyes can result in vision loss.
  • Narrowed or damaged vessels can increase the risk of blood clots.
  • Reduced blood flow to the brain can cause a stroke.
  • Some types of vasculitis can contribute to heart inflammation, heart attack, or other heart problems.
  • Inflammation in the digestive tract can cause gastrointestinal injury, pain, or bleeding.
  • Severe or prolonged loss of blood flow can cause tissue damage.

WHY TREATMENT MATTERS

Protecting organs

Prompt evaluation and treatment can reduce the risk of permanent organ damage. Urgent symptoms such as severe breathing difficulty, sudden vision changes, chest pain, or new weakness need immediate medical care.

Diagnosis

How Vasculitis Is Diagnosed

There is no single test that diagnoses every form of vasculitis. Clinicians combine your medical history, physical examination, organ-specific findings, and test results to determine whether blood-vessel inflammation is present and which organs may be affected.

  • A complete blood count and inflammation tests can look for blood-cell changes and general inflammation.
  • Kidney and liver blood tests help assess whether these organs are affected.
  • Urinalysis can detect blood or protein that may indicate kidney involvement.
  • Antibody testing, including ANCA, may support evaluation for certain types of vasculitis.
  • Imaging such as ultrasound, CT, MRI, or chest scans can show vessel or organ changes.
  • Angiography may be used when clinicians need detailed images of selected blood vessels.
  • A biopsy can examine a small tissue sample for the characteristic inflammation pattern.

Classifying the type of vasculitis

Treatment & Management

Vasculitis Treatment and Management

Vasculitis treatment depends on the type, severity, organs involved, and whether an underlying trigger can be removed. The goals are to calm inflammation, protect organs, prevent relapse, and treat complications. Treatment can bring some forms into remission, but there is no guaranteed cure for every type of vasculitis.

  • Corticosteroids are often used to reduce blood-vessel inflammation quickly.
  • Other immunosuppressive or targeted medicines may be used when disease is severe, persistent, or likely to damage organs.
  • An infection or medicine trigger may be treated or removed when it is considered responsible.
  • Organ-supportive care may include treatment for kidney, lung, nerve, or other affected organs.
  • Blood-thinning treatment may be used when blood clots occur and clinicians determine it is appropriate.
  • Surgery or another procedure may be needed for selected complications, such as severe vessel narrowing or tissue damage.

Outlook and Prognosis

Outlook and Prognosis for Vasculitis

The outlook for vasculitis varies widely. Some forms are short-lived or respond well to treatment, while others are chronic, can relapse, or may cause lasting organ damage. Individual prognosis depends on the subtype and how quickly inflammation is recognized and controlled.

  • The specific vasculitis subtype strongly influences expected course and treatment response.
  • The organs affected can determine both the seriousness of illness and the monitoring needed.
  • Greater severity at diagnosis may increase the risk of complications.
  • Starting treatment promptly can improve the chance of controlling inflammation and protecting organs.
  • The response to treatment helps clinicians adjust medicines and estimate disease control.
  • A history of relapses may mean longer-term treatment and closer follow-up are needed.
  • Medication side effects can affect management and may require changes in therapy.

When Should You See a Doctor

When Should You See a Doctor?

  • Arrange medical evaluation for an unexplained rash that persists or keeps returning.
  • Recurring fever without a clear cause should be discussed with a clinician.
  • Unexplained weight loss warrants medical assessment.
  • New numbness, tingling, or weakness may require evaluation for nerve involvement.
  • Blood in the urine should be assessed promptly.
  • Persistent sinus symptoms, cough, or other lung symptoms should be checked, especially when they occur together.
  • Symptoms affecting more than one body system should prompt an appointment because they may indicate systemic vasculitis.

GET EMERGENCY HELP

Do not wait for severe symptoms

Seek emergency care for sudden vision loss, severe shortness of breath or coughing blood, chest pain, new one-sided weakness, severe abdominal pain, confusion, or rapidly worsening symptoms.

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