If a patient has a fever on the body but not a fever, there are usually several diseases as follows: 1. From the perspective of Western medicine, it is due to the upward shift of the hypothalamic thermoregulation center, usually due to severe compression and blow to the brain and pituitary area, such as acute cerebral infarction, acute cerebral embolism, acute cerebral hemorrhage or traumatic brain injury, etc. 2. A fever on the body but not a high body temperature is usually induced by factors such as endocrine and hypermetabolism, for example, hyperthyroidism and hyperadrenalism. 3. For example, hyperthyroidism and hyperadrenalism can cause the above symptoms. 3, for body heat but not fever, the above clinical symptoms can also occur at the beginning of a viral cold. 4, from the perspective of Chinese medicine, it is caused by the body fire, usually liver fire and lung fire is too high, there will be clinical manifestations of body heat but not high body temperature.