It is possible for an autoimmune disease to present with some of the same symptoms as cancer, such as fatigue, weight loss, and fever. However, they are two distinct conditions and cannot be classified as the same thing. Autoimmune diseases are caused when the body's immune system mistakenly attacks healthy tissue, while cancer is caused by the uncontrolled growth of abnormal cells. Autoimmune diseases are typically treated with medications that suppress the immune system, while cancer is treated with a combination of surgery, radiation, and chemotherapy. Therefore, while the two conditions may share certain symptoms, they are distinct and should not be classified as the same thing.