Body burning like a furnace may be caused by rheumatic immune diseases, infectious diseases and other reasons. 1. Rheumatic immune diseases: If a patient suffers from rheumatic diseases, systemic lupus erythematosus and other rheumatic immune diseases, a large number of inflammatory cells in the body during the onset of the disease release inflammatory factors, resulting in body temperature abnormalities, which can appear as hot as a stove. 2. Infectious diseases: If the patient has an infectious disease caused by bacteria, virus or fungus, the body temperature may be high, and the body may be hot like a stove. If the body is hot like a stove, you should consult a doctor to find out the cause.