A sore throat in the morning may be caused by a dry environment, chronic rhinitis-sinusitis or a cold. 1. Environmental dryness: If the environment is too dry when you sleep, it will lead to a large loss of water on the surface of the mucous membrane of the throat, thus triggering the phenomenon of over-drying of the mucous membrane, which may stimulate the cause of pain in the throat or hoarseness and other uncomfortable symptoms. 2. Chronic rhinitis – sinusitis: when there is chronic rhinitis, sinusitis, due to the night sleep, nasal congestion leads to open-mouth breathing, the mucous membrane of the throat is dry, sore throat symptoms can occur. 3. Colds: Colds are also a common cause of sore throats, and the cold itself can lead to varying degrees of inflammation and dryness in the mucous membrane of the throat. At the same time, colds often cause nasal congestion and open-mouth breathing, exacerbating the dryness of the throat, and then wake up in the morning after the obvious feeling of sore throat. When you wake up early with a sore throat, you should consult a doctor to confirm the cause of the illness and choose the appropriate treatment under the doctor’s guidance.