Wash your hair with cold water, OK?

Washing your hair with cold water on a hot day can easily cause headaches. Many people like to wash their hair with cold water when sweating profusely on a hot day, which can easily cause headaches. Because the arteries and blood vessels in the human skull are very sensitive to pain, in the hot season, the head is prone to sweating after exercise. At this time, the blood vessels are dilated. If you wash with cold water, it may cause abnormalities of the intracranial blood vessels. Darkness and vomiting may also cause intracranial hemorrhage in severe cases, so after a lot of exercise, be sure to rinse with warm water. Elderly people with cardiovascular and cerebrovascular diseases should pay more attention. The temperature of the shampoo water should be 31～38℃. Too hot water can damage the hair, making it brittle and easy to break; if the water is too cold (cold), the effect of removing oil stains is poor, and the washing is not clean. When changing the water, use water in succession The water mixture should be roughly the same. It is not suitable to be cold and then hot or hot and then cold. The best is warm water because warm water can expand skin capillaries and superficial dermis blood vessels, open sweat pores and promote the excretion of metabolic waste, thus detergency Stronger than cold water, especially the dust attached to the hair shaft is easier to be removed. If you wash your hair with cold water in the cold winter, it can also cause a cold
It is best not to wash your hair with cold water, but try to wash it with hot or warm water, so that your hair will be cleaner. Washing your hair with cold water for a long time will make the nerves in the brain unable to withstand stimulation, and will cause headaches and dizziness. Washing your hair with hot water can refresh your body and help the nutrition of your hair fingers, making it less likely to lose hair. Therefore, it is better to wash your hair with hot water.