Some parents go to the hospital to see the doctor prescribed “physiological seawater”, feel very surprised, “water” can also cure the disease? The composition of physiological seawater: physiological seawater is a sterilized 0.9% sodium chloride seawater solution, its osmotic pressure value and normal human plasma, tissue fluid are roughly the same. Physiological seawater is rich in beneficial minerals and trace elements (iodine, silver, zinc with bactericidal effect, copper with anti-inflammatory effect, manganese with anti-allergic effect) and does not contain antibiotics, hormones, vasoconstrictors. The role of physiological seawater: 1, in addition to maintaining the physiological balance of the body, but also can play a bactericidal, anti-inflammatory, anti-allergic effect. 2.Through the quantitative micro-spray system, the physiological seawater is sent to the deep nasal cavity, diluting all kinds of purulent secretions on the mucous membrane surface, making it easier for patients to discharge secretions out of the body, thoroughly cleaning the nasal cavity and keeping the nasal cavity moist. 3.It can restore the movement of nasal cilia and promote nasal excretion; 4.The seawater nebulized particles adsorbed on the mucous membrane surface of nasal cavity can also reduce mucous membrane edema and relieve nasal congestion. 5.It is non-irritating to the mucous membrane, mild and comfortable, and can better regulate the pH value of the nasal cavity, so that the nasal cavity can maintain a normal acid-base environment and more effectively inhibit the reproduction of harmful bacteria. 6.Correct nasal ph value, maintain nasal mucosa and restore nasal immune function. 7.Protect the nasal mucosa from germs, smoke, dust, pollen, sand, allergies and dry climate and other daily aggressions, and play the role of rinsing and daily care of nasal cavity before and after nasal surgery and before and after radiotherapy. Unlike normal seawater, physiological seawater is processed seawater that has reached a concentration of 0.9% NaCl solution that is isotonic with the human body. Physiological seawater is different from physiological saline. Physiological seawater is rich in beneficial minerals and trace elements, which can play the role of sterilization, anti-inflammation and anti-allergy. Contraindications 1.People with large nasal trauma; 2.People with severe sodium chloride metabolism disorder and allergy. In summary, physiological seawater is safer to use in children because it basically has no side effects. Moreover, the 2012 European guidelines for the treatment of rhinosinusitis include nasal spray sea saline as a category A recommendation for children; at the same time, the 2012 Kunming Conference in China and the Practical Pediatric Otolaryngology also recommend the use of saline irrigation. This shows that physiological seawater can cure the disease and is safe and effective.