There are many causes of phlegm in the mouth, the common ones are rhinitis, pharyngitis, pneumonia, chronic obstructive pulmonary disease and so on.
1. Rhinitis: acute and chronic rhinitis, sinusitis, etc. can stimulate the mucous membrane of the nasal cavity, resulting in inflammatory changes, increased secretion, nasal congestion, runny nose, but also phlegm in the mouth;
2. Pharyngitis: acute and chronic pharyngitis is often associated with pathogenic microbial infections, chemical or physical stimuli, the pharyngeal mucosa is congested and swollen, there will be fever, sore throat, runny nose and other symptoms, and there may be mucous phlegm in the mouth.
3. Pneumonia: mostly caused by bacterial, viral, mycoplasma and other infections, common symptoms include fever, fatigue, cough, cough, etc., there may be sputum in the mouth, and rest plus antibiotics to fight infection is often needed.
4. Chronic Obstructive Pulmonary Disease (COPD): mostly caused by a history of long-term smoking, patients have chronic cough, coughing up white sputum, wheezing, shortness of breath after activity and other symptoms, especially in the morning, there can be sputum in the mouth.
When there is phlegm in the mouth, you should consult a regular hospital to find out the cause of the disease and treat the cause.