Granulomatosis with polyangiitis (GPA) is an autoimmune disorder. An autoimmune disorder occurs when the body's immune system attacks and destroys healthy tissue. GPA causes inflammation, swelling, and irritation in blood vessels and other tissues.

The inflammation reduces or stops the flow of blood to organs in the body. The condition mostly affects the respiratory system. This includes the sinuses, nose, windpipe, and lungs. It may also affect the kidneys, or it can damage any organ in the body.

The exact cause of GPA is unknown. It's not hereditary or contagious. And it's not common. While it can start at any age, it mostly affects adults age 40 to 65.

Most people with GPA first have vague symptoms that may include:

• Tiredness or exhaustion.
• Joint pain.
• Upper respiratory symptoms that don't respond to treatments for allergies or colds, such as:
  • Runny nose.
  • Bloody discharge.
  • Sinus pain.
  • Congestion.
  • Blockage of the eustachian tubes in the ears.
  • Cough.
  • Cough that produces blood.
  • Shortness of breath.
• Eye infections, redness, burning, or pain.
• Weakness.
• Skin sores or ulcers.
• Hoarseness.
• Fever.
• Night sweats.

To diagnose GPA, your doctor may:

• Ask your health history.
• Do a physical exam.
• Review your symptoms.
• Order blood tests.
• Order imaging tests, such as chest X-rays or CT scans, of the lungs or sinus.
• Do a biopsy from an affected organ to see if the condition is present.
• Order urine tests.
• Order a biopsy.

Some of these tests can help rule out other causes of your symptoms. They may not confirm the diagnosis. A biopsy is the only way to know for sure if it's GPA.

Most people with GPA can be treated. However, the medicines used to treat this condition could have side effects of their own. Be sure to talk about benefits and side effects with your doctor.

These are common medicines used in treatment:

• Corticosteroids. This steroid helps reduce inflammation. Long-term steroid use can affect your bone health, so your doctor may also watch and treat changes in your bone density. Other possible side effects may include high blood pressure, diabetes, fluid retention, and mood swings.
• Rituximab. This is an antibody against certain immune cells (B-cells). These cells help cause the inflammation in GPA.
• Cyclophosphamide. This is used to treat active GPA and certain cancers.
  • It may be given to keep symptoms in remission for 1 to 2 years.
  • It may be given along with prednisone to treat GPA and bring about remission.
• Antibiotics. Certain infections are more common among people with this condition. Antibiotics may be given to treat or prevent infection. If your doctor prescribes antibiotics, take them as directed. Do not stop taking them just because you feel better. You need to take the full course of antibiotics.
• Plasmapheresis. For severe cases, the liquid portion of the blood (plasma) is filtered to remove the antibodies that cause GPA.

GPA may come back even after successful treatment. Continue to follow up with your doctor, even when you're feeling better.

Ongoing GPA can cause:

• Collapse of cartilage in the nose.
• Infections of sinuses and ears.
• Hearing loss.
• Kidney damage.
• Kidney failure.
• Death.

Contact your doctor if you have the symptoms listed above. This is especially true if you have tried over-the-counter treatments that seem appropriate, such as allergy medicines, with no success.

Always call your doctor if you have changes in vision or if you have a cough that makes bloody mucus. These may be symptoms of granulomatosis with polyangiitis (GPA) or another serious health problem.

• Granulomatosis with polyangiitis (GPA) is an autoimmune disorder that causes swelling and irritation in blood vessels and other tissues. It's uncommon.
• The exact cause is unknown. It's not hereditary or contagious.
• Most people with GPA first report vague symptoms.
• Biopsy of affected areas is the only way to know for sure if it's GPA.
• Most people with GPA will find relief of symptoms by taking strong medicines.
• GPA may come back, even after successful treatment.
• Ongoing GPA can have serious complications.
• Continue to follow up with your doctor, even when you're feeling better.

Tips to help you get the most from a visit to your doctor:

• Know the reason for your visit and what you want to happen.
• Before your visit, write down questions you want answered.
• Bring someone with you to help you ask questions and remember what your provider tells you.
• At the visit, write down the name of a new diagnosis and any new medicines, treatments, or tests. Also write down any new directions your provider gives you.
• Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are.
• Ask if your condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if you do not take the medicine or have the test or procedure.
• If you have a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your doctor if you have questions, especially after office hours or on weekends.