Question: What is (are) Lupus Nephritis ?
Answer: The kidneys are two bean-shaped organs, each about the size of a fist. They are located just below the rib cage, one on each side of the spine. Every day, the two kidneys filter about 120 to 150 of blood to produce about 1 to 2 quarts of urine, composed of wastes and extra fluid. The urine flows from the kidneys to the bladder through tubes called ureters. The bladder stores urine until releasing it through urination.
Source: NIDDK

Question: What are the symptoms of Lupus Nephritis ?
Answer: The symptoms of lupus nephritis may include high blood pressure, foamy urine, and edemaswelling, usually in the legs, feet, or ankles and less often in the hands or face. Kidney problems often develop at the same time or shortly after lupus symptoms appear and can include - joint pain or swelling - muscle pain - fever with no known cause - red rashes, often on the face, which are also called butterfly rashes because of their shape
Source: NIDDK