The body does not have a fever but feels hot on its own may be caused by high ambient temperature, autonomic dysfunction, perimenopausal syndrome and so on. 1. High ambient temperature: If you are in a high ambient temperature, which is generally higher than your own temperature, you will obviously feel hot, but there is no fever. 2. Autonomic dysfunction: generally due to psychological stress, mental tension and other factors, resulting in a variety of clinical symptoms, the patient may appear abnormal blood pressure, sweating, self-awareness of fever and other symptoms, but also accompanied by depression, anxiety and other negative emotions. 3. Perimenopausal syndrome: often occurs before and after menopause, caused by changes in the level of sex hormones in the body, often feel palpitations, dizziness, hot flashes. The body does not have a fever, but feel hot, if accompanied by other uncomfortable symptoms may be caused by disease, should be timely to the hospital to identify the cause of targeted treatment.