Patients who often feel phlegm and cough are mainly considered to be caused by infections of the respiratory tract, with viruses, bacteria and other pathogenic microorganisms stimulating the local mucous membrane, which can cause congestion and edema, and also increase secretions. If you do not pay attention to the active treatment, do not pay attention to diet and rest, it is easy to recurring episodes cause chronic inflammation, can cause chronic bronchitis, chronic pharyngitis, appear often phlegm cough symptoms, usually regular smoking or eating irritating food also has a great impact. You need to pay attention to rest, pay attention to diet, try to avoid eating irritating food, pay attention to quit smoking, and actively treat respiratory tract infections. If you have chronic sinusitis or postnasal drip syndrome, it can also cause secretions to enter the throat through the nasopharynx, causing symptoms of coughing and phlegm.