Some netizens often ask this question. The following is the answer of Dr. Duan from Shenyang Otolaryngology Hospital for your reference. Dr. Sun pointed out that because there is often some dirt around the nostrils attached to the nasal vestibule, causing discomfort, so people often pick it with their fingers. Some people love to pluck their nose hair or cut it very short, which destroys the first line of defense of the respiratory tract. This is a bad habit. As we all know, when people breathe, the air passes through the nasal cavity, and most of the bacteria and dust mixed in the air are blocked by the nose hair, which means that the nose hair plays a certain filtering role when inhaling air. If the nose hair is pulled out or cut too short, dust and bacteria will enter the respiratory tract in large quantities, which is very harmful. In addition, plucking nose hair or digging nose may cause local injury, bringing a lot of dirt and bacteria into the nasal cavity, causing infection. The above is the answer from the otolaryngologist of Shenyang Tianqiao Chinese Medicine Hospital. For more related questions, the online doctor will diagnose you. Welcome to online communication.