The nose consists of three parts: external nose, nasal cavity and sinus. The health of the nose is very important to a person. This entry starts with the structure of the nose, briefly describes the symptoms and causes of the nose, and introduces in detail the treatment after the nose onset, prevention and health care in daily life. Some patients often put forward the theory of fighting poison with poison, that is, after taking a cold bath or swimming in a cold pool, the body is not so afraid of cold, but will try to wash the nose with cold water, hoping to improve the sensitivity of allergic rhinitis to temperature difference. However, just like the morning swimming in winter, it needs to be gradual.