When you wake up in the morning with phlegm in your throat, it may be caused by reflux pharyngitis, post-nasal drip syndrome, bronchitis and other reasons. 1. Reflux pharyngitis: when the contents of the stomach, reflux to the throat area, the local mucous membrane and the surrounding tissue damage, easy to cause reflux pharyngitis, which will lead to phlegm in the throat against the upper part of the throat, may also be accompanied by the symptoms of dry throat, sore throat. 2. Post-nasal drip syndrome: may be related to nasal mucosal lesions, which can increase inflammatory substances, backflow into the throat, which will lead to get up in the morning with phlegm in the throat, may be accompanied by coughing, coughing and other symptoms. 3. Bronchitis: may be related to infectious factors, environmental factors, can make the presence of inflammation infection in the bronchial tubes, will lead to get up in the morning throat against the top of the phlegm, may also be accompanied by nasal congestion, runny nose, recurrent cough and other symptoms. If you get up in the morning with phlegm in your throat, it may also be caused by nasopharyngitis, etc. You should consult a doctor as soon as possible for a clear diagnosis and treatment under the doctor’s guidance.