1, the head will dissipate part of the heat in the human body, and the blood vessels of the whole body will expand when the temperature drops. If cold water is used to stimulate the head at this time, the blood vessels in the head will contract rapidly, so that too much hot air in the body cannot be discharged normally. At the same time, the head environment from hot to cold, the lack of a gradual transition to adapt to the process of the head, it is easy to cause a cold.

2. In the high temperature season, the head is prone to sweating after exercise, and the blood vessels are in a dilated state at this time. If washed with cold water, cold stimulation will force blood vessels to contract, which may cause abnormal intracranial vascular function, thus inducing dizziness, black eyes and vomiting, and even serious intracranial hemorrhage.

3. Washing your hair with cold water can't clean your head, because warm water can dilate skin capillaries and superficial dermis blood vessels, open sweat pores and promote the excretion of metabolic wastes. The detergency is stronger than cold water, and the dust attached to the hair shaft is easier to remove.

4, cold water shampoo, will also lead to excessive water in the body. People with heavy moisture are weak, often cold hands and feet, and are prone to various problems.

Extended data:

Traditional Chinese medicine and western medicine have many differences in health concepts, but they are the same in shampooing-it is best to wash your hair every other day, three or four times a week, instead of washing your hair every day.

Avoid using shampoo that is too alkaline. You can use conditioner every time you wash your hair to reduce the damage to your hair.

Dry your hair in time. Experts point out that you should blow dry your hair as soon as possible after washing your hair, otherwise it will easily cause migraine and hair loss.

Combing your hair is as important as washing your hair. Chinese medicine experts point out that there are many people engaged in mental work in today's society, and combing their hair often can promote blood circulation in the head and keep healthy.

References:

People's Network-Teach you the correct way to wash your hair: it is best to wash it every other day.