Heatstroke usually occurs at the time of the symptoms, can be divided into mild, severe to divide. 1. Mild: heatstroke is caused by excessive heat accumulation in the body, in general exposure to high temperature environment for about 30 minutes, the patient may appear heatstroke phenomenon, most of the patients after heatstroke symptoms will be manifested as fever, hot and dry, irritability, headache, dizziness, drowsiness, and even coma, coma, should be immediately to the shade to rest. 2. Severe: severe heatstroke may lead to muscle spasms, decreased blood pressure and coma symptoms, and even a certain threat to the life-threatening individual, the common symptoms of the performance of the skin has a burning sensation, weakness, and even dehydration and lead to cold limbs, pale and other symptoms. Should be detached from leaving the high temperature environment, timely call the emergency telephone. When working outside, you should pay attention to wearing a sun hat, sun shading tools, etc., to avoid prolonged exposure to the sun in the high temperature.