Please answer! what other systems does lupus nephritis affect?

Lupus nephritis: Lupus nephritis affects only the kidney, that's why it is called nephritis. Lupus can affect other parts of the body apart from the kidneys. For a more detailed answer go to this link: http://www.Lupusnsw.Org.Au/lupus/signs-and-symptoms-of-lupus/57-how-does-lupus-affect-the-body.

Autoimmune, systemic: Lupus can affect any part of the body. Common symptoms - joint pains, facial rash, photosensitivity, mouth ulcers, hair loss. Organ involvement usually kidney, brain. Nephritis means kidney inflammation-if kidney function is low, it can causes retention of water in the body and electrolyte derangements