Anca Vasculitis

Overview

ANCA vasculitis is a rare autoimmune disease in which the immune system mistakenly attacks small blood vessels, causing inflammation and damage. The word 'vasculitis' means inflammation of blood vessels. ANCA stands for anti-neutrophil cytoplasmic antibodies, which are abnormal proteins found in the blood of many people with this condition. When left untreated, the inflammation can harm organs such as the kidneys, lungs, skin, and nerves.

No, ANCA vasculitis is rare. It is estimated to affect only about 10 to 20 people per million each year worldwide, though it may be more common in certain regions and ethnic groups.

ANCA vasculitis can occur at any age, but it most often starts between the ages of 40 and 70. It affects both men and women, although certain forms are more common in one sex. It can affect people of all backgrounds.

Symptoms

Common symptoms

• Persistent fever and night sweats
• Unexplained weight loss and loss of appetite
• Feeling very tired or weak
• Joint and muscle aches
• Skin rashes, including small purple spots, red bumps, or skin ulcers
• Shortness of breath, cough, or coughing up blood
• Sinusitis, nosebleeds, or crusting in the nose
• Kidney problems, such as blood in the urine, foamy urine, or decreased urine output
• Nerve problems, such as numbness, tingling, or weakness in hands or feet

Symptoms in children

• Fever and fatigue
• Skin rashes, especially on the lower legs
• Joint pain and swelling
• Abdominal pain or bloody diarrhea
• Kidney problems, such as blood or protein in the urine
• Nosebleeds or persistent sinus congestion

Symptoms in older adults

• More pronounced fatigue and weakness
• Confusion or memory difficulties
• Falls or balance issues
• Reduced appetite and unintentional weight loss
• Sudden onset of kidney failure
• Increased risk of infections due to weakened immune system

Causes

Main causes

• The exact cause is unknown, but it is believed to involve an abnormal immune system response.
• In some cases, the immune system produces antibodies (called ANCA) that attack white blood cells, which then trigger inflammation in blood vessels.
• Environmental triggers such as infections, certain medications, or exposure to silica or other substances may play a role in people who are genetically predisposed.

Risk factors

• Genetics – having certain genes may make you more susceptible.
• Age – most cases occur in middle age or later.
• Exposure to environmental substances, such as silica dust from construction or farming.
• History of certain infections, like bacterial infections that stimulate the immune system.
• Use of certain medications, but this is rare and not fully proven.

When to see a doctor

See a doctor urgently if:

• If you are coughing up blood
• If you have severe shortness of breath or chest pain
• If you notice a significant decrease in urine output or blood in your urine
• If you have a high fever and are feeling very unwell

Book a routine appointment if:

• If you have several of the common symptoms on this list, such as persistent fever, unexplained weight loss, joint pain, or skin rashes that don't go away.
• If you have new kidney problems, like foamy urine, swelling in your legs, or high blood pressure that is hard to control.
• If you have persistent sinus problems or nosebleeds that are unusual for you.

Diagnosis

Diagnosis is made through a combination of your symptoms, a physical examination, blood tests, imaging studies, and sometimes a biopsy of affected tissue. There is no single test for ANCA vasculitis, so doctors usually need to piece together several clues.

Tests that may be done

• Blood tests to check for ANCA antibodies and markers of inflammation (like ESR or CRP).
• Blood tests to check kidney function and complete blood count.
• Urinalysis to look for blood, protein, or other signs of kidney involvement.
• Chest X-ray or CT scan of the chest to look for lung changes.
• Sinus CT scan or nasal examination for upper respiratory involvement.
• Biopsy (taking a tiny sample of tissue) from an affected area, such as the kidney, lung, or skin, to confirm inflammation and blood vessel damage.

What to expect at your appointment

You will likely be referred to a specialist such as a rheumatologist (joint and autoimmune disease specialist) or a nephrologist (kidney specialist). Diagnosis may take a few weeks, and during this time you may have multiple tests. The care team will explain everything and answer your questions. Treatment often starts soon after a confirmed diagnosis, sometimes while the diagnostic process is still ongoing if symptoms are severe.

Treatment

Treatment for ANCA vasculitis aims to stop the inflammation, protect your organs, and get the disease into remission (controlled). Most people need a combination of medicines that work to calm the immune system. Treatment usually has two phases: an initial phase to control the disease quickly, and a longer maintenance phase to keep it under control and prevent relapse.

Self-care at home

• Take all medicines exactly as prescribed and keep regular appointments with your specialist.
• Monitor your health daily – track your temperature, weight, urine output, and any new symptoms.
• Protect yourself from infections, because both the disease and treatment can weaken immunity. This includes frequent hand washing, avoiding crowded places when possible, and getting recommended vaccines.
• Rest when you feel tired, and gradually increase activity as your energy returns.
• Communicate openly with your care team about side effects or concerns — never stop or change medications on your own.

Medical treatments

Treatment usually involves high-dose corticosteroids (powerful anti-inflammatory medicines) to bring down inflammation quickly. These are often combined with other medicines that suppress the immune system to stop it from attacking your blood vessels. In severe cases, a treatment called plasma exchange (a procedure that filters antibodies from your blood) or a short course of intensive medicine given through an IV may be used. The exact combination and duration depend on your specific situation and how severe the disease is. Your healthcare team will work with you to choose a plan that is safe and effective, while managing side effects.

When is surgery considered?

Surgery is rarely needed for ANCA vasculitis itself. However, if the disease has caused severe damage to a kidney, removal of a kidney (nephrectomy) might be considered in very unusual cases. Surgery may also be needed to treat complications like an abscess or a perforated bowel due to vasculitis in the digestive tract.

Living with this condition

Living with ANCA vasculitis can be challenging, but many people learn to manage it well. You will likely need to see your specialist regularly and have blood and urine tests to monitor the disease. Adjusting to a new normal is part of the journey – some days are better than others. Allow yourself time to rest and recover, and keep a symptom diary to help you and your doctor find patterns.

Lifestyle tips

• Get enough sleep and rest during the day when needed, especially during flares.
• Stay active within your limits – gentle activities like walking, swimming, or yoga can help maintain strength and mood.
• If you smoke, seek help to quit, as smoking can worsen lung involvement.
• Avoid infections by practicing good hygiene and staying up to date with vaccines (with your doctor's advice).
• Find ways to reduce stress, such as mindfulness, deep breathing, or talking with friends and family.

Diet and exercise

There is no special diet that cures ANCA vasculitis, but eating a balanced diet rich in fruits, vegetables, whole grains, and healthy proteins can support your immune system and overall health. If you are taking steroids, your doctor may advise limiting salt and sugar to help control blood pressure and blood sugar. Regular, moderate exercise can help counteract muscle weakness from steroids and improve energy, but always check with your doctor before starting a new exercise program.

Mental health and emotional wellbeing

Living with a chronic illness can cause stress, anxiety, and depression. It is completely normal to feel worried or sad. Talking to a trusted friend, family member, or mental health professional can help. Support groups, either in person or online, allow you to connect with people who understand what you are going through. Remember to be kind to yourself and celebrate small victories.

Prevention

There is currently no way to prevent ANCA vasculitis because the exact cause is unknown. However, early detection and prompt treatment can prevent or reduce organ damage and improve long-term outcomes. Regular check-ups and knowing what symptoms to look out for are important.

Vaccines

Vaccinations are recommended to protect against infections that could be dangerous for someone with a weakened immune system. This includes flu, pneumococcal, and COVID-19 vaccines, as well as others that your healthcare provider suggests. Talk to your doctor about which vaccines are right for you, as some live vaccines may not be safe while you are on immunosuppressive treatment.

Screening programmes

There is no routine screening test for ANCA vasculitis in the general population. However, if you have a family history of autoimmune disease or symptoms that persist, your doctor may run blood tests to check for inflammation and ANCA antibodies.

Complications

If left untreated

• Kidney damage leading to chronic kidney disease or kidney failure, requiring dialysis or transplantation.
• Lung damage, such as bleeding into the lungs or scarring, causing severe breathing problems.
• Permanent nerve damage, leading to weakness, numbness, or paralysis.
• Heart or large blood vessel involvement, increasing the risk of heart attack or stroke.
• Skin ulcers or gangrene that may require skin grafts or amputation in severe cases.
• Damage to the esophagus, bowel, or other digestive organs, causing bleeding or perforation.

Long-term outlook

The outlook for ANCA vasculitis has improved dramatically over the past few decades. With modern treatment, most people achieve remission, and many can lead active, full lives. Some people may experience relapses, but these can often be caught early and treated. Your long-term health depends on how well the disease is controlled and how quickly you receive care. Finding a healthcare team you trust, staying engaged in your treatment, and taking care of your physical and emotional health all contribute to a hopeful future.

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