The heat and lack of energy are usually caused by the following three reasons. First, heat stroke, in the summer high temperature, high humidity environment, especially under the vertical irradiation of the sun’s ultraviolet rays, prolonged labor will lead to a lot of sweating, will lead to weakness, body temperature, dizziness, headache accompanied by nausea, vomiting. In this case, the heart rate is accelerated, accompanied by pallor, confusion or transient coma, should be considered to be summer heatstroke caused by the weakness of the body. Secondly, the most common cause of weakness in the heat is hypoglycemia. When the body’s blood sugar is lower than 3.9 mmol/L, dizziness, weakness and weakness will occur. Especially in the summer when the body is hot easily lead to hypoglycemic reaction, when the supplemental glucose can relieve the symptoms. Thirdly, the weakness and weakness in the heat are also caused by wind-heat cold. Wind-heat cold can cause weakness, nausea, vomiting with dry throat, sore throat, fever, often with weakness as the typical clinical symptoms.