Why is it easy to get dizzy when it is hot or after entering and leaving an air-conditioned room, like heatstroke?

Experts say that air-conditioning diseases are mainly manifested in three aspects, especially the respiratory tract, so we should start from these aspects when preventing them, and treat them in time once the corresponding symptoms appear. In addition, most people who suffer from air-conditioning diseases now are young people, especially white-collar office workers who work in companies and often work under central air conditioning, so these people should pay special attention. First, the most "fragile" trick of the respiratory tract-pay attention to the misunderstanding of temperature conversion: Many families are afraid of blowing cold air and catching a cold, so they turn on the air conditioner and cover the quilt at night, thinking that this can prevent air-conditioning diseases. In fact, the respiratory tract is the most fragile, and covering the quilt can only keep warm but not prevent diseases. Although the household air conditioner is not suitable for Legionella to grow, it will not get pneumonia, but cold air enters the human body from the respiratory tract, and when you wake up, your nose and mouth are dry, and you will still have cold symptoms. Therefore, it is sometimes impossible to prevent cold air from invading the respiratory tract. Once the air conditioner breaks through the fragile "defense line" of the respiratory tract, there will be cold symptoms such as cough, sneezing and runny nose, that is, upper respiratory diseases. For Guang 'anmen Hospital, among the medical outpatient visits of nearly 800 people every day, there are 40 to 50 cases of colds caused by air conditioning alone. Director He said that this kind of cold is often called a cold. On the one hand, because of frequent access to air-conditioned rooms, the body can not adapt to the uneven temperature; Second, because the air-conditioned rooms are closed, there are many people in the room and the air circulation is poor. If a person has cold symptoms, it will soon spread to others. Air conditioning causes serious lower respiratory diseases, especially pneumonia. Especially when working and studying under central air conditioning, central air conditioning is very suitable for the spread of Legionella. The incubation period is about 2- 12 days. Although the upper respiratory tract is unresponsive, it causes fever, chills, muscle aches, dry cough, no phlegm or less phlegm. If not treated in time, it will continue to have a fever, dry cough and chills. Most antibiotics are ineffective and will die of respiratory failure in severe cases. In addition, although the room is cold, the humidity is too low, which is not good for people's eyes and nasal mucosa. A dry environment is suitable for the survival of bacteria and viruses. People should be especially careful when their noses and throats are dry. At the same time, the dust and dust mites at home cannot circulate, and people with allergies are prone to allergic reactions. Expert tip: If you often go in and out of air-conditioned rooms, there must be a temperature transition, such as turning up the temperature or turning off the air conditioner first, and you must dry your sweat first when you enter the door. Stay in an air-conditioned room for a long time, drink as much water as possible, and often mop the floor with a mop filled with water to moisturize. If you have cold symptoms, you should go to the hospital in time to avoid deterioration and cross infection. Susceptible population: people who often go in and out of air-conditioned rooms; The elderly, children and other people with chronic diseases or low immunity, especially those who receive hormone drugs and smokers. Second, the brain and nerves will be unbalanced-the misunderstanding of strengthening air circulation: it is often seen that young people and people with fat bodies turn on the air conditioner all day at home, or enter the house sweating from the outside and adjust the temperature very low. Some people even ran to the air conditioner to blow directly, just for a moment, but they didn't know that the speed of direct blowing air would increase, the temperature would drop by 3℃-4℃, and their heads would faint. Moreover, sudden cold air can easily stimulate sweat pores to contract suddenly, causing headaches. I often hear people who often sit in air-conditioned rooms say, "I feel dizzy and see stars, and forget things." According to Director He, this is a common brain imbalance reaction caused by air conditioning disease. Director He said that air conditioning will not only catch a cold, but also cause serious damage to the brain. The negative ions contained in the air can inhibit the central nervous system and relieve brain fatigue. But the air conditioner absorbs too many anions, which makes more and more cations in the room. The imbalance of anion and cation also makes the human brain nervous system unbalanced. If indoor air conditioning only makes you dizzy and sick, then indoor air conditioning adds a little danger to the driver's brain and nerves. Many drivers who are used to turning on air conditioners sometimes feel tired, headache and numbness in their hands and feet. It is easy to get sleepy in summer, lose control of the brain and feel uncomfortable all over, which is easy to cause traffic accidents. Expert tip: Try to avoid staying in an air-conditioned room for a long time. If possible, it is best to keep the room temperature around 24℃, and the temperature difference between indoor and outdoor exceeds 7℃. Always open the window for ventilation to ensure indoor and outdoor air convection. 1-3 hours after startup, it is best to turn off the air conditioner for a period of time and open the window to breathe fresh air. Natural cold air is the best. If conditions do not permit, it is best to go to outdoor corridors and other places with windows for air exchange every hour, especially during lunch break. The most important thing is not to blow directly under the air conditioner because of the heat. Once you feel dizzy, you must leave the air-conditioned room in time and breathe fresh air. For the driver, if the car is extremely hot, don't turn on the air conditioner immediately. Open the window to exhaust the hot air before turning on the air conditioner. The temperature can't be too low, so it's best not to smoke. Besides, don't sleep in the car with the air conditioner on. If you catch a cold, the carbon monoxide emitted by the engine leaks into the car and is easily poisoned. Susceptible population: people who work and study in offices and office buildings under central air conditioning for a long time; Patients with neurological diseases such as migraine; Young men; Fat people who are afraid of heat and drivers. Third, the tricks that joints and intestines are easy to catch a cold-take a warm bath and exercise more. Myth: Many people don't realize the harm caused by turning on the air conditioner for a long time, and feel that they just have a cold, dizziness and headache, especially young and strong people don't care. As we all know, cold air does great harm to joints. If you don't pay attention to keep warm, you will get sick.