A fever is generally defined as a body temperature above normal (37°C), while a fever may be due to an increase in body surface temperature, but not necessarily above normal. If it is summer, the body is hot but not feverish may be caused by heat stroke. Usually when the heat stroke is relieved, the symptoms of body burning will gradually disappear. It may also be due to fire, which is called yin deficiency internal heat in Chinese medicine, often manifested as irritable heat, night sweats, dry mouth and tongue. For this situation can be appropriate to take some Chinese medicines to regulate, should also drink more water, diet light, avoid greasy and spicy stimulation, eat more fresh vegetables and fruits, usually pay more attention to rest. In addition, the cause of body heat but not fever may be metabolic abnormalities such as hyperthyroidism, it is recommended to go to the hospital to do thyroid function measurement. Menopausal women can also experience hot body, panic, sweating and other symptoms. Prolonged mental tension may also appear hot, such as neurosis, should be appropriate to relax themselves, work and rest, adjust the mentality. All in all, when the body is hot, the first thing to rule out is heat stroke. If the patient is older, in addition to feeling hot, accompanied by a dry throat, sweating, hot flashes, night sweats, etc., we should consider the case of Yin deficiency and fire. In addition, some diseases of the endocrine system should be ruled out.