In medicine, arthralgia (literally: "joint pain", from "arthros" = "joint" and "-algia" denoting "pain") is the presence of painful joints in the absence of frank arthritis. It is present in a number of rheumatological diseases, most notably lupus erythematosus. Medicine is a branch of health science concerned with maintaining health and restoring it by treating disease. ... Arthritis (from Greek arthro-, joint + -itis, inflammation) is a group of conditions that affect the health of the bone joints in the body. ... Rheumatology, a subspecialty of internal medicine, is devoted to the diagnosis and treatment of rheumatic diseases. ...