Body temperature of 36.9℃, but feel feverish, may be related to environmental factors and autonomic dysfunction and other factors. 1. Environmental factors: body temperature 36.9 ℃, belongs to the normal body temperature, from the normal situation, will not appear all over the body fever and other uncomfortable symptoms. But due to the high temperature of the environment, resulting in hot and stuffy environment, it will make the body appear the subjective illusion of generalized fever. 2. Autonomic dysfunction: autonomic dysfunction due to a variety of reasons, will make people appear hot flashes (a burst of heat) discomfort, such as menopausal syndrome, hyperthyroidism, and so on. As the feeling of generalized fever is a subjective feeling, so the specific situation needs to consult a doctor in a timely manner, under the guidance of the doctor to analyze in combination with other clinical manifestations.