Patients who sleep with their mouths open mainly consider the following aspects: First, it is likely that there are anomalies in the congenital anatomical structure, such as patients with severe mandibular recession, and often sleep with their mouths open. Problems in the pharynx, such as excessive enlargement of the tonsils and hypertrophy of the tongue, can easily lead to open-mouth breathing, and sometimes the patient’s nasal mucosa is congested and hypertrophied, leading to nasal congestion, which can only rely on the open mouth to solve the problem of ventilation. Second, the patient is too obese, the neck is particularly fatty easily lead to airway narrowing, in this case the patient also need to open the mouth to breathe. No matter which of the above causes are triggered, patients can go to the hospital for a detailed examination, and then actively deal with it after clarification.