First of all, the arterial blood vessels in the human brain are very sensitive to pain. If they are washed with cold water, it may cause abnormal intracranial vascular function, and there will be dizziness, black eyes and vomiting during the attack. People who have never taken a cold bath before, if they suddenly take a cold bath, will make their blood vessels contract, their body temperature drop, and their bodies catch cold, leading to colds.

Secondly, it is best not to wash your face in a cold shower, because the respiratory system is concentrated there, which is prone to respiratory diseases caused by cold. You should keep your head dry when taking a cold shower.

In short, washing your hair with cold water in winter is definitely harmful to your health, not only in winter, but also in other seasons, and it is not good to wash your hair with cold water in the morning. It is recommended to wash your hair with warm water.