Nasogastric tube how long to replace once, there is no accurate clinical conclusion, according to the manual is recommended to replace once a week, clinically, according to many clinical experience, it is recommended to replace once in 3-4 weeks, the main reasons are as follows: first, the nasal feeding tube, mainly used for coma or pharynx can not eat through the mouth of the patient, for such patients, clinical down the nasal feeding tube itself is also a It is a very painful process to enter the esophagus and stomach from the nasal cavity, nasopharynx and pharynx, and in the process of going down the tube, the patient may have pain in the nasopharynx, bleeding in the nasal cavity, foreign body sensation in the pharynx, mispharyngeal, choking and coughing and other related reflexes, which may be even more painful, especially for the comatose patients, so frequent replacement of nasogastric tubes is not recommended. Secondly, in the process of nasal feeding tube application, patients may have nasal discomfort, nasopharyngeal discomfort and pharyngeal discomfort, and if the nasal feeding tube is changed for a long period of time, it may induce the patients to experience increased discomfort, which may easily induce nasal bleeding. Thirdly, most of the nasal feeding tubes are made of imported materials, for the imported materials of nasal feeding tubes, its material is better, the stimulation to the nasopharynx and throat is smaller, and the stimulation to the stomach is smaller, and clinically there is no need to change the nasal feeding tubes frequently for a long period of time.