Anyone can get lupus but women are most at risk.

If you have lupus, your immune system attacks healthy cells and tissues by mistake. This can damage your joints, skin, blood vessels and organs. There are many kinds of lupus. The most common type, systemic lupus erythematosus, affects many parts of the body. Discoid lupus causes a rash that doesn't go away. Subacute cutaneous lupus causes sores after being out in the sun. Another type can be caused by medication. Neonatal lupus, which is rare, affects newborns.

Anyone can get lupus, but women are most at risk. Lupus is also more common in African American, Hispanic, Asian and Native American women. The cause of lupus is not known.

Lupus has many symptoms. Some common ones are

1. Joint pain or swelling

1. Muscle pain

1. Fever with no known cause

1. Fatigue

1. Red rashes, often on the face (also called the "butterfly rash")

There is no one test to diagnose lupus, and it may take months or years to make the diagnosis. There is no cure for lupus, but medicines and lifestyle changes can help control it.

What causes lupus?

Although doctors are do not know exactly what causes lupus and other autoimmune diseases, most believe that lupus results from both genetic and environmental stimuli.

Since lupus is known to occur within families, doctors believe that it is possible to inherit a genetic predisposition to lupus. There are no known genes, however, that directly cause the illness. It is probable that having an inherited predisposition for lupus makes the disease more likely only after coming into contact with some environmental trigger.

The higher number of lupus cases in females than in males may indicate that the disease can be triggered by certain hormones.

Physicians believe that hormones such as estrogen regulate the progression of the disease because symptoms tend to flare before menstrual periods and/or during pregnancy.

Certain environmental factors have been known to cause lupus symptoms. These include:

•     Extreme stress
•     Exposure to ultraviolet light, usually from sunlight
•     Smoking
•     Some medications and antibiotics, especially those in the sulfa and penicillin groups
•     Some infections, such as cytomegalovirus (CMV), parvovirus (such as fifth disease),              hepatitis C infections, and the Epstein-Barr virus (in children)
•     Chemical exposure to compounds such as trichloroethylene in well water and dust