According to the theory of traditional Chinese medicine, the head is the "meeting of all yang". When the ambient temperature is 65438 05℃, the heat lost from the head accounts for 30% of the whole body heat. If the temperature is 4℃, the total heat loss from the head accounts for 60%. Cold weather will make blood vessels contract, and people will have headaches and dizziness. For people with cerebrovascular diseases, cold can easily induce cerebrovascular diseases. It can be seen that it is very important to keep your head warm.