IgA Nephropathy

What is IgA Nephropathy?

IgA nephropathy is a kidney disease that happens when a protein called immunoglobulin A builds up in your kidneys. This buildup causes inflammation that damages the tiny filters in your kidneys. Over time, your kidneys lose their ability to remove waste and extra water from your blood.

The condition is also called Berger's disease. It often develops slowly over many years. Some people live with IgA nephropathy for decades without knowing they have it. Others may progress to kidney failure and need dialysis or a transplant.

IgA is normally a helpful antibody that protects you from infections. But in IgA nephropathy, abnormal forms of this protein deposit in the kidneys instead of being cleared away. Scientists are still working to understand exactly why this happens in some people.

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Symptoms

Blood in the urine, often appearing as dark tea or cola colored urine
Foamy urine from protein leaking into urine
Swelling in the hands, feet, or face
High blood pressure
Flank pain or discomfort in the side or back
Fatigue and low energy
Decreased urine output

Many people with IgA nephropathy have no symptoms in the early stages. The condition is often discovered during routine urine tests or after an upper respiratory infection triggers visible blood in the urine.

Causes and risk factors

The exact cause of IgA nephropathy is not fully understood. Researchers believe it involves a combination of genetic factors and immune system problems. Your body produces abnormal IgA antibodies that clump together and deposit in the kidneys. These deposits trigger inflammation that damages the kidney's filtering units over time.

Risk factors include being male, having Asian or Caucasian ancestry, and being between ages 16 and 35 when symptoms first appear. A family history of IgA nephropathy increases your risk. Certain infections, especially respiratory and digestive tract infections, can trigger flare-ups. Liver disease may also play a role in some cases.

How it's diagnosed

IgA nephropathy is diagnosed through a kidney biopsy. A doctor removes a small piece of kidney tissue and examines it under a microscope for IgA deposits. This is the only way to confirm the diagnosis. Before a biopsy, your doctor will order urine tests to check for blood and protein, and blood tests to measure kidney function and IgA levels.

Blood tests can measure IgA levels and assess how well your kidneys are filtering waste. While elevated IgA levels may suggest the condition, they are not enough for diagnosis on their own. Talk to a doctor about testing if you notice symptoms or have risk factors for kidney disease.

Treatment options

Blood pressure medications, especially ACE inhibitors or ARBs, to protect kidney function
Fish oil supplements containing omega-3 fatty acids to reduce inflammation
Corticosteroids or other immune-suppressing medications in severe cases
Low-sodium diet to help control blood pressure and reduce swelling
Moderate protein intake to ease the workload on your kidneys
Staying hydrated with adequate water intake
Avoiding NSAIDs like ibuprofen that can stress the kidneys
Prompt treatment of infections to prevent flare-ups
Regular monitoring with blood and urine tests
Dialysis or kidney transplant if kidney function declines significantly

Frequently asked questions

IgA nephropathy is specifically caused by IgA protein deposits in the kidneys. Other kidney diseases may result from diabetes, high blood pressure, or other immune problems. The only way to tell IgA nephropathy apart from other kidney conditions is through a kidney biopsy that shows IgA deposits.

IgA nephropathy is a chronic condition that does not usually go away. Some people have mild disease that stays stable for many years. Others experience slow progression that eventually leads to kidney failure. Early detection and treatment can help slow the disease and protect kidney function.

These are opposite conditions. IgA nephropathy involves abnormal IgA deposits in the kidneys. IgA deficiency means your body does not make enough IgA antibody. They affect different organs and require different treatments.

Limit sodium to help control blood pressure and reduce swelling. Moderate your protein intake to ease kidney workload. Avoid processed foods high in phosphorus and potassium if your levels are elevated. Work with a dietitian to create a kidney-friendly eating plan tailored to your needs.

Not everyone with IgA nephropathy needs dialysis. About 20 to 40 percent of people progress to kidney failure within 20 years. Early treatment and lifestyle changes can help slow progression. Regular monitoring helps your doctor track kidney function and plan treatment.

Yes, infections can trigger flare-ups of IgA nephropathy. Upper respiratory infections and stomach bugs often cause visible blood in the urine. Treating infections promptly and maintaining good hygiene can help reduce flare-ups. Some doctors recommend avoiding live vaccines during active disease.

IgA nephropathy can run in families, suggesting a genetic component. However, most cases occur in people with no family history. If you have a relative with the condition, your risk is higher. Genetic testing is not routinely used for diagnosis.

Most people need blood and urine tests every 3 to 6 months. Your doctor will check kidney function, protein levels, and blood pressure. More frequent testing may be needed if your condition is worsening or if you start new medications.

Yes, lifestyle changes can help protect your kidneys. Control your blood pressure through diet and medication. Maintain a healthy weight and exercise regularly. Avoid smoking and limit alcohol. These steps reduce stress on your kidneys and may slow disease progression.

The outlook varies widely. Some people have mild disease that never progresses. Others develop kidney failure within 10 to 20 years. Factors that affect prognosis include the amount of protein in your urine, blood pressure control, and kidney function at diagnosis. Early treatment improves long-term outcomes.