In recent days, cold air has hit a wide range of areas, and it has been active in most areas of China. Wind, snow, and snow have appeared in various regions. According to meteorological forecasts, the cold current in the next week still controls most of our country. A "roller coaster" occurs at the temperature and precautions must be taken to prevent cold and health. However, health care must also be scientific, and it is not possible to act alone based on experience and feelings so as not to affect health.

In autumn and winter, everyone has some cold-proof experience, but sometimes they also go into misunderstandings. The following small series summarizes several common misunderstandings.

Myth #1: The more you dress, the warmer you are. When the total thickness of the air layer exceeds 15 mm, the air convection in the clothes is significantly increased, but the warmth is decreased. In addition, the expansion of blood vessels in the skin increases the heat dissipation, but it reduces the body's ability to adapt to changes in outside temperature.

Myth 2: Wear masks to prevent colds. The cold air sucked by the nose is close to body temperature when it enters the lungs through a meandering pipe. This physiological function of the human body can be enhanced through exercise so as to improve cold resistance.

Misunderstanding 3: Warm hands and feet after freezing. It is very easy to get frostbite. The correct method is to wipe bare hands and feet from each other in a place not far from the heater, so that the temperature of the hands and feet will naturally rise. When the skin surface becomes red, move to the heater or warm water. Usually if you can wash your hands, wash your face or wash your feet with cold water, you can enhance the body's ability to resist cold, and it is not prone to frostbite.

At the same time, in the turn of autumn and winter, despite the fact that the weather is no longer hot, it is often the case that people have more morbidity. Commonly there are bronchitis, asthma, and "hot gale." In addition, due to the long yin and yang in the autumn, the resistance of the gastrointestinal tract is reduced, and the bacteria can easily enter and damage the spleen and stomach, leading to gastrointestinal problems. People with stomach problems should pay more attention to keeping the abdomen warm. Therefore, in the fall/winter alternate temperature “roller coaster”, health care should be taken care of to prevent disease.