When drinking water, you will warm up and have a cold war.

The weather is cold, and the temperature difference between inside and outside the body is too large. Warm-up and cold war after drinking water belongs to the body's response to the external cold stimulus, which is a normal physiological response, so don't worry too much. Usually, you should eat a reasonable diet and drink less cold water.

The cold war is the body's self-protection mechanism. When the ambient temperature drops, the brain will mobilize the muscles of the whole body to produce a short period of intense exercise.