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Electric fans are common items in every family, however, when using them, you need to be careful to use them properly to avoid unnecessary damage to your health. Simple knowledge that you don't know is pitiful! Should you use an electric fan in the summer to rotate or stand still? When using a fan, many people often leave the fan stationary throughout the entire session, while some people like to keep the fan in rotation mode. In fact, whether to let the fan stand still or rotate depends on your intended use. If you need to concentrate the wind in a specific area, leaving the fan stationary is a good choice. A stationary fan is suitable when you need to cool quickly or when you want to dry a wet area. However, leaving the fan standing still for long periods of time can cause poor air circulation in the room, which can create conditions for bacteria and viruses to grow. On the contrary, when you want to cool the room evenly for better air circulation, you should leave the fan in rotation mode. Letting the fan rotate also helps reduce the constant exposure of wind to the body, minimizing many different health problems. However, no matter what mode you turn on the fan, it is important that you place the fan in an airy location, about 2m away from your body and avoid letting the fan point directly at you, especially when Sleeping. In particular, you should not use the fan continuously for too long to avoid harm to your health as well as causing the device to be damaged faster. Types of fan use are harmful to health Turn on the fan all night According to Healthline, using fans can cause unwanted health problems, such as: Dry mouth, nose, throat, eyes, skin. Can cause headaches, stuffy nose, sore throat or even snoring. May trigger allergic reactions in some people due to dust, pollen or other airborne pathogens. May cause muscle pain or cramps if the fan is turned on strong and blows directly at the body. In particular, if you use the fan continuously for a long time, the above problems may occur more. Fan straight to the body and head Do not let the fan blow directly on the body or head Putting a fan directly on the body or head can cause headaches, dizziness, muscle pain, and even a cold. According to experts, it is better to keep the fan about 2 meters away from your body, and at the same time, you should let the fan rotate evenly, and should not let the fan blow directly on your body. Turn on the fan in a closed and overheated room When there is no air circulation, bacteria and viruses can grow, creating conditions for respiratory diseases to develop. The New York Post cited a study showing that turning on a fan in a very hot, dry space can increase body temperature, causing dehydration and stress on the cardiovascular system. Turn on the fan at high speed for a long time This not only consumes a lot of electricity but can also cause problems such as dry skin, dry eyes and dry throat. Sit in front of a fan while sweating a lot When the body sweats a lot, it causes blood vessels to dilate. Therefore, if you sit right in front of the fan at this time, especially turning the fan on at high speed, it will cause blood vessels to suddenly constrict and cause headaches and even dangerous strokes. Better yet, you should dry the sweat from your body and sit far away from the fan to cool your body slowly. Using a fan that is too old or not cleaned properly Old fans can be unsafe in terms of electrical safety, and dirty fans can spread dirt and bacteria into the indoor air, harming the respiratory system.