Lupus is an autoimmune disease with no known cause that predominantly affects women aged 15-44, especially those of African American, Asian, Native American, or Pacific Islander descent. Common symptoms include arthritis, joint pain, fever, fatigue, skin rash, and sensitivity to sunlight. While there is no cure for lupus since it is a chronic condition that produces antibodies against a person's own tissues, treatment focuses on managing symptoms with medications like steroids, immunosuppressants, and anti-inflammatories.