Dry tongue in the morning can be caused by physiological or pathological reasons, common pathological factors include oral diseases, dry syndrome, diabetes, pharyngitis and so on. 1. Physiological factors: such as poor diet, long-term alcoholism, late at night, etc., can cause the symptoms of dry tongue in the morning. Some people sleep with their mouths open to breathe at night, the oral mucosa is directly exposed to the air, so they also wake up in the morning with a dry tongue. 2. Oral diseases: such as oral chronic submandibular gland inflammation, oral gland stones and other diseases, can make the oral gland lesions lead to reduced salivary secretion, so there is a dry mouth, dry tongue symptoms. Fungal infections such as Candida localized in the oral cavity can also cause the manifestation of a dry tongue, accompanied by a burning sensation of the tongue. When gingivitis is severe, it can also spread to the surrounding teeth and deep tissues, resulting in dryness of the tongue. 3. Dry syndrome: dry eyes and dry mouth are the most prominent manifestations. There will also be a decrease in the secretion of salivary glands in the oral mucosa, resulting in a dry tongue in the morning. 4. Diabetes: patients due to high blood sugar, resulting in increased osmotic urination, resulting in the loss of water in the body, which is manifested in dry mouth, thirst, etc., resulting in the phenomenon of dry tongue in the morning. 5. Pharyngitis: dry tongue in the morning can also be seen in atrophic pharyngitis. Due to the pharyngeal mucosa and submucosal gland atrophy, which leads to the mucosal surface cilia function is affected, appear pharyngeal foreign body sensation, dry mouth, tongue dryness and other performance. In short, when the phenomenon of dry tongue in the morning, it is recommended to consult a doctor in a timely manner, a clear diagnosis, for the cause of the treatment.