It's so cold in winter. Why wash your hair after washing it?

Some people have headaches in cold winter when the weather is cold, so what are the reasons for headaches when the weather is cold? Let's have a look.

As we all know, low temperature will lead to the contraction of capillaries on the surface of human body, which will lead to the increase of blood pressure. This increase in blood pressure caused by cold is called cold pressurization reaction. The typical manifestations of cold pressurization reaction are numbness of limbs, cold hands and feet and headache. It is not surprising that the blood pressure of the elderly is relatively high and they are prone to headaches in winter.

Therefore, it is best to wear a scarf and hat to keep warm when going out in cold weather; When you walk from outdoor to indoor with heating, open the window to cool down first, so as to avoid the headache caused by high temperature and the body has no time to adapt. In winter outdoor sports, it is best to wear a hooded coat or hat to avoid vasodilation during exercise, but the epidermis is exposed to cold air, which leads to poor vascular regulation; If you sweat during exercise, dry it with a towel or handkerchief as soon as possible to avoid headache caused by sweating and catching cold.

Winter is cold and dry, and it is also vulnerable to virus infection. After someone is infected with the virus, respiratory symptoms may not necessarily appear, but only headache and dizziness. In addition, the elderly are infected with many viruses, such as rhinovirus, echovirus, adenovirus and so on. When reinfected by these viruses, sometimes it will not cause serious diseases, but it will cause headaches, just like colds and headaches. This kind of headache usually disappears after 3 ~ 4 days. Oral painkillers can relieve headaches caused by latent virus infection.

In winter, due to the cold, doors and windows are closed, so be alert to the headache caused by mild carbon monoxide poisoning. Therefore, paying attention to indoor air circulation in winter is an effective measure to prevent this headache, especially for rural families to take open fire for heating, and pay more attention to heating safety.

After taking a bath in winter, you should put on warm clothes quickly to avoid headaches caused by excessive temperature difference between inside and outside the bathroom. You can also use air conditioning to raise the temperature of the room or living room, so that after bathing, people's heads will not be exposed to cold air, and it is not easy to have symptoms of head discomfort.

Of course, the elderly or hypertensive patients should not get up immediately after taking a shower. They should sit by the bathtub first and soak their feet in the water. After the heartbeat and breathing are stable, get up slowly and wear good clothes to keep warm to prevent dizziness and rapid vasoconstriction.

Women who love beauty like to wash their hair in winter, which actually affects the warmth of hair on their heads. Because dry hair can keep air in the gaps of hair, it can achieve the insulation effect of isolating the external temperature, while wet hair has no such effect; If you don't blow dry your hair in time after washing your hair, it will absorb heat energy when the water evaporates, which will make your scalp and neck catch cold, cause excessive contraction of blood vessels and cause headaches.