A hot body without fever may be related to the surrounding environment; endocrine system diseases such as hyperthyroidism need to be analyzed on a case-by-case basis. If there is too much change in the temperature of the surrounding environment, it is possible that it will cause the manifestation of heat on the body. It may also be due to overdressing or excessive activity in daily life, etc. These factors may cause body heat, but not fever. Endocrine system diseases, such as hyperthyroidism, increase the body’s metabolism, which may be hot and sweaty, but if there is no inflammation or infection, there will be no fever. If the patient has long-term symptoms of body heat, should consult a doctor in a timely manner, a clear diagnosis, in order to avoid delaying the condition.