Waking up with a dry mouth can be a normal phenomenon, such as habitually sleeping with the mouth open, or due to illnesses that cause nasal congestion and open mouth breathing, or due to yin deficiency, which leads to the symptoms of waking up with a dry mouth. 1. Normal phenomenon: when due to lifestyle habits, such as from childhood to sleep with an open mouth, it will lead to waking up with dry mouth symptoms. 2. Nasal congestion: when suffering from a cold and then nasal congestion, or nasal choking nasal congestion, or due to nasal blockage of foreign bodies, the need for the mouth to assist breathing, and then wake up dry mouth symptoms. 3. Yin deficiency: when the patient due to the lack of yin fluid, or in the menopause period, the body is hot, can lead to the emergence of waking up with dry mouth symptoms, accompanied by insomnia, irritability, night sweats (after falling asleep sweating abnormally, wake up sweating to stop), emaciation, red tongue with little moss and other performance. When waking up from a sleep with dry mouth, please go to the hospital in time, under the guidance of the physician for treatment, so as to avoid delaying the condition.