Fever is a pathological phenomenon, which generally means that the body temperature exceeds the normal level (37℃); while body fever may be due to the rise in body surface temperature, but not necessarily above the normal level. At this time, the body may feel hot and sweat on its own. Body fever, may have some relationship with the external environment, for example, in the hot season for some outdoor sports, or the indoor environment where the temperature is too high, may be self-feeling body fever, this is a normal physiological performance, this time to timely hydration, or to find some cool and ventilated place to rest, to avoid heat stroke. In the case of emotional excitement, due to the accelerated heart rate and increased metabolism of the body, the body will also feel feverish and even flushed, this fever will often subside on its own after the emotional stability. In addition, patients with what is known as Yin deficiency fire in Chinese medicine may also experience irritable heat in the five hearts, soreness and weakness in the waist and knees, and a red tongue with little coating. When one feels feverish, but the body temperature is within the normal range, it is important to consider whether there are other symptoms such as profuse sweating, flushing, chest tightness, night sweating, etc.; if it is a hot season, exclude heat stroke. Of course, if the patient is older, you can see a TCM practitioner to see if it is Yin deficiency and fire in combination with pulse and tongue coating. For women around 50 years old, they should also visit a gynecology clinic to exclude menopausal syndrome.