Hypoglycemia refers to the syndrome caused by low blood glucose concentration due to various reasons. The main symptoms of hypoglycemia are: easy hunger, agitation, weakness, sweating, tachycardia, elevated systolic blood pressure, reduced diastolic blood pressure, tremor, transient black haze, impaired consciousness, and even coma. Preventive measures: 1, three meals a day must be regular. As far as possible, eat less or no snacks, people are iron, rice is steel, rice is our necessary food, appropriate more warm food, abstain from cold food and cold drinks, but also have enough water every day, eat more vegetables and fruits. 2, to ensure sufficient sleep time (7 ~ 8 hours is appropriate). Avoid excessive mental tension and cultivate an optimistic life mood. 3, diet pay attention to hygiene. Do not eat moldy, spoiled food, so as not to cause enteritis, dysentery and other diseases, 4, morning and evening travel need to keep warm. As the saying goes: “an autumn rain a cold, ten autumn rain cotton on the body”, clothes should not increase too much at a time, for most people in good health, appropriate freezing a freeze, which helps the body to improve the ability to adapt to changing weather. 5, outdoor exercise more adhere to. Emphasis on cold exercise to enhance physical fitness. 6, indoor ventilation and ventilation do not forget.