Overview

Lupus nephritis is a serious complication of systemic lupus erythematosus in which the immune system attacks the kidneys. This immune response causes inflammation and damage to the kidney’s filtering units, leading to impaired kidney function. Lupus nephritis can range from mild to severe and, if untreated, may progress to chronic kidney disease or kidney failure. Early diagnosis and treatment are essential to protect kidney health.

Symptoms

Symptoms of lupus nephritis may develop gradually and can vary in severity:

  • Swelling of the legs, ankles, feet, or around the eyes

  • Foamy urine due to excess protein

  • Blood in the urine

  • High blood pressure

  • Decreased urine output in advanced cases

  • Unexplained weight gain from fluid retention

Some individuals may not notice symptoms until significant kidney damage has occurred.

Causes

Lupus nephritis occurs when abnormal immune activity in lupus leads to inflammation in the kidneys. The immune system produces antibodies that form immune complexes, which deposit in kidney tissues and trigger inflammation. This process damages the glomeruli, the structures responsible for filtering waste from the blood.

Risk Factors

Factors that increase the risk of developing lupus nephritis include:

  • Diagnosis of systemic lupus erythematosus

  • Female sex

  • Younger age at lupus diagnosis

  • Certain ethnic backgrounds

  • High levels of lupus disease activity

Genetic and environmental factors may also influence risk.

Complications

If not properly treated, lupus nephritis can lead to serious complications:

  • Chronic kidney disease

  • End-stage kidney failure

  • Severe high blood pressure

  • Fluid buildup in the lungs

  • Increased risk of infections

  • Cardiovascular disease

Regular monitoring and timely treatment help reduce the risk of long-term kidney damage.

Prevention

There is no guaranteed way to prevent lupus nephritis, but proper management of lupus can lower the risk:

  • Taking prescribed lupus medications consistently

  • Attending regular medical checkups

  • Monitoring kidney function through blood and urine tests

  • Controlling blood pressure

  • Avoiding medications that may harm the kidneys

  • Maintaining a healthy lifestyle

Early detection and aggressive treatment are key to preserving kidney function in individuals with lupus nephritis.

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