Cold hands in winter and hot hands in summer are clinically considered to be related to one’s own constitution and environmental factors. 1. Physical condition: some people’s physical condition is poor, the blood circulation ability is relatively weak, the limbs can’t effectively maintain the normal temperature through blood circulation in winter cold condition, and the limbs can’t dissipate the heat to maintain the normal body temperature through blood circulation in summer hot condition. 2. Environmental factors: cold hands in winter, hot hands in summer, this situation is also a normal phenomenon, when the limbs are cold in winter, the body will perceive a drop in its temperature, the summer temperature is higher limb body temperature will also rise. It is recommended that the general population should exercise properly to enhance physical fitness, pay attention to the cold in winter to keep warm, and pay attention to the summer heat to relieve heat.