“Is lupus cancer or not?”

Lupus is NOT CANCER. Lupus is an autoimmune disease. "Auto" means "self." Auto immunity is an immune reaction against yourself. Lupus is where your body makes antibodies (the same antibodies that fight off infections) against itself. As you can imagine, it is not a great idea for the body's immune system to attack itself. This can cause problems ranging from MILD (such as a rash) to SEVERE (such as kidney failure). Some people with lupus do not have too many problems and they do fine with the medications that are used to calm down the body's natural immune response. HOWEVER, some people with lupus seem to have constant problems and flare-ups. So, the disease can be either mild or serious. It is typically treated by a rheumatologist. Rheumatologists treat a lot of immune type of diseases such as rheumatoid arthritis and lupus. So, to answer your question, NO, lupus is NOT cancer at all.

Not even close. It is caused by an over-active immune system.

No, for stomach lupus is not a cancer. Cancers are diseases in which malignant cells multiply and grow. They cause damage in tissue. Systemic lupus erythematosus is an autoimmune disease with defects in the function of the immune system which can affect many organs. Occasionally, chemotherapeutic drugs are used with lupus to control some of the autoimmune abnormalities. There are rare forms of lung disease which are more common in some lupus patients, but most often occur in smokers, just like in non-lupus patients.