Sodium chloride is sodium chloride injection, which is also known as saline. Generally, sodium chloride injection can be used to rinse the nasal cavity, and patients can use it under the guidance of doctors. Medical sodium chloride is 0.9% sodium chloride injection, which is a sterile isotonic solution that does not harm the mucous membrane of the nasal cavity and can be used for nasal irrigation treatment of acute and chronic rhinitis, sinusitis, and allergic rhinitis. The rinsing of the nasal cavity with sodium chloride injection can flush out the mucous or purulent nasal snot, dust mites and other substances adhering to the nasal cavity, which helps to recover the nasal mucosa. When using sodium chloride injection for nasal rinsing, attention should be paid to the concentration; if the concentration is too high, a hypertonic environment will be formed and the nasal mucosa will be damaged. Care should also be taken not to use too much force when rinsing to avoid flushing secretions or bacteria through the eustachian tube to the middle ear and causing otitis media. However, patients need to note that although sodium chloride nose wash has a certain effect on relieving symptoms, it does not uproot the cause of the disease, and patients need to take medication for targeted treatment under the guidance of a professional doctor.