When the weather is hot, you will feel dizzy. What is the reason?

Many people have this situation. The reasons may be as follows: First, the summer temperature is high, the summer heat is pressing, and the human body sweats a lot in order to cool down. If you don't replenish water in time at this time, the blood volume of the human body will be reduced, and the blood supply to the brain will be insufficient, leading to headache. In addition, when people sweat, the blood vessels on the body surface dilate and the blood is diverted from the inside out. The redistribution of blood will lower the blood pressure of people with low blood pressure, thus causing headaches, which are medically called intracranial pressure or hypotensive headache. Second, in summer, people often have headaches because of poor sleep, weak spleen and stomach and poor appetite. This kind of headache is caused by malnutrition and low blood sugar, which leads to the lack of necessary energy in the brain and headache. Third, people are used to drinking cold drinks in summer. Although cold drinks are sweet and refreshing, some people will have a headache after drinking one. This is because the burning mouth and mucous membrane can't stand the sudden stimulation, causing submucosal vasospasm. At the same time, the reflex vasospasm is short-lived, but it will make the brain unable to stand this sudden blood loss and make a quick stress response, which will make people have a headache. This kind of headache is called cold drink headache. Suggestion: You can try these feasible methods 1 to prevent heatstroke and cool down, avoid working in a high temperature environment for a long time, and minimize the energy consumption of your body. 2. Replenish water in time, it is advisable to drink warm water, eat more fruits and vegetables to supplement water, vitamins and salt-free losses. 3. Eat light and digestible food and often drink sugary drinks. People who have a headache due to cold drinks should avoid drinking cold water. 5. In addition to replenishing water in time, you should also take a low-degree pillow or no pillow position to make blood flow to the brain as much as possible. I hope it helps you.