A dry and sore throat at night with the air conditioner on may be due to open-mouth breathing caused by vasomotor rhinitis, dry pharyngitis, allergic rhinitis combined with atrophic pharyngitis and other diseases. 1. vasomotor rhinitis caused by open-mouth breathing: the cause of its development is not clear, mostly considered to be related to the environment, sudden changes in temperature, mental tension, anxiety and other reasons, due to a variety of external stimuli, resulting in nasal mucosal vasodilatation, resulting in severe nasal congestion, thus causing open-mouth breathing, there will be a night air conditioning dry throat. 2. Dry pharyngitis: the disease is usually caused by long-term exposure to dust, irritating gases, etc., can lead to patients with nasal humidification function is weakened, resulting in the pharyngeal mucosa humidity is reduced, and nasal secretion blockage, resulting in open-mouth breathing, causing the pharyngeal dryness obviously, there will be a night air conditioning dry throat pain. 3. allergic rhinitis combined with atrophic pharyngitis: if you suffer from allergic rhinitis, combined with atrophic pharyngitis, can lead to the patient’s nose ventilation is not smooth, dry and itchy throat, pain, especially at night when the air conditioning is particularly pronounced when the throat is dry and sore, but also accompanied by nasal congestion, pharyngeal sensation of a foreign body and other manifestations. The night open air conditioning dry throat pain, may also be related to other factors, it is recommended to seek medical advice as soon as possible, diagnose the causes, give targeted treatment and conditioning.