Lupus (systemic lupus erythematosus) is a serious and potentially fatal autoimmune disease that mainly affects young women. The disease often starts between the ages of 15 and 44. The manifestations of lupus are diverse: it can affect many parts of the body, including the joints, skin, kidneys, heart, lungs, blood vessels, and brain. People of all races can have lupus; however, ...

Reactive arthritis is a chronic form of arthritis featuring the following three conditions: (1) inflamed joints, (2) inflammation of the eyes (conjunctivitis), and (3) inflammation of the genital, urinary, or gastrointestinal systems. This form of joint inflammation is called "reactive arthritis" because it is felt to involve an immune system that is "reacting" to the presence of bacterial infections in the ...