Symptoms of Lupus Nephritis
Lupus nephritis is kidney inflammation caused by lupus. For the most part, kidney problems in lupus are caused by damage to clusters of blood vessels in the kidneys called glomeruli. People who have lupus and associated glomerular damage have lupus glomerulonephritis (LGN). LGN occurs when antibodies and complement proteins build up in the kidneys and cause inflammation.

Signs and Symptoms
If you are developing lupus nephritis, you may notice these signs and symptoms:

Foamy urine
Swelling, usually in the feet, ankles, and legs
High blood pressure
Joint pain or swelling
Muscle pain
Fever with no known cause
Red rashes, often on the face