Lupus is a chronic autoimmune disease where the body's immune system mistakenly attacks its own tissues and organs. This can lead to inflammation and damage in various parts of the body, including the skin, joints, kidneys, and heart. Symptoms can vary widely and may include fatigue, joint pain, skin rashes, and fever. There are several types of lupus, with the most common being systemic lupus erythematosus (SLE). The exact cause of lupus is not fully understood, but it is believed to involve a combination of genetic, environmental, and hormonal factors. Treatment often focuses on managing symptoms and reducing inflammation.