Sleep open mouth breathing is a relatively common clinical symptom, to be divided into several aspects to see: 1, children sleep open mouth breathing, commonly adenoid hypertrophy, to go to the hospital in a timely manner to do exclusion tests; 2, if the adult open mouth breathing, to ask the medical history, symptoms, there is no combination of nasal symptoms, such as nasal congestion, will lead to airflow through the inability to breathe through the nose, so it will naturally open mouth breathing; 3, Habitual open-mouth breathing, such as jaw joint causes open-mouth breathing, will be more comfortable. This situation generally does not require excessive intervention, but to change the body position, because long-term open-mouth breathing is not good for the throat, will often feel dry throat, long-term airflow stimulation, no humidification function, resulting in lymphatic follicle hyperplasia in the throat, resulting in foreign body sensation in the throat; 4, open-mouth breathing accompanied by snoring is relatively loud, must do a sleep monitoring to assess.