What are the hazards of cold water shampoo?

First, washing with cold water may cause abnormal intracranial vascular function, dizziness, black eyes, vomiting, and even intracranial hemorrhage in severe cases, so be sure to wash with warm water.

Second, compared with warm water, the effect of cold water shampoo is very poor. Because warm water can dilate skin capillaries and superficial dermis blood vessels, make sweat pores open, and promote the excretion of metabolic waste, the decontamination power is stronger than cold water, and the dust attached to hair shafts is easier to remove.

1. The sudden stimulation of cold water leads to the contraction of skin capillaries and superficial dermis blood vessels, which in turn leads to the contraction of sweat pores and hinders the normal metabolism of the skin. Dirt that could have been removed and some metabolites hidden in sweat pores that should have been excreted will remain in the body.

2. Wash your hair with warm water and cleaning products, and massage your scalp with your fingertips, which can promote blood circulation, but be careful not to scratch your scalp with your nails, which is easy to hurt your scalp. Massage the scalp with your fingers through shampooing is a good way to release stress. Hair roots are mainly cleaned for those with oily scalp, and those with dry scalp should not be cleaned for too long, so as to avoid the contact between shampoo and scalp for too long.

3. If you wash your hair at night and don't blow dry it completely, water will stay on your scalp. Doing so for a long time will lead to qi stagnation and blood stasis, and the meridians will be blocked. If it is cold and wet in winter, it is a great hidden danger to your health. Some people often fall asleep with wet hair at night, and after a period of time, they will feel scalp pins and needles, accompanied by faint headaches; Some people will feel scalp pins and needles the next morning after washing their heads, and they are prone to catch a cold. As you get older, you will gradually feel numb on the top of your head, accompanied by dizziness and headache.

It is not advisable to wash your hair before going out in the morning, especially when the weather is cold, because your hair is not dry, your pores are open, and you are easy to catch cold, even a mild person will have a cold and headache. If this happens frequently, it may also lead to joint pain and even muscle paralysis.

Baidu encyclopedia-shampoo