Coughing up phlegm may be caused by acute pharyngitis, acute tracheobronchitis, etc., which makes the phlegm very sticky, and the amount of phlegm is very small there may be a cough with phlegm that cannot be coughed up. You can promote the expulsion of phlegm through medication, effective back patting and other methods. 1. Acute pharyngitis: may be due to viral infection and other exogenous stimuli resulting in acute inflammation of the pharyngeal mucosa, submucosal tissues and lymphatic tissues, there will be pharyngeal dryness, pharyngeal burning, dry mouth, coughing with phlegm can not be coughed up and other symptoms. Local treatment can be taken: gargling with compound borax solution; application of antiviral drugs, such as acyclovir; oral laryngeal tablets, such as watermelon cream laryngeal tablets and other drugs for treatment. 2. Acute tracheobronchitis: these patients will cough up phlegm, nasal congestion, sore throat, wheezing and other symptoms, you can use back patting to make the phlegm vibration, to help discharge phlegm, at the same time can be used to acetylcysteine, bromhexine, Pentoxyverine and other drugs for treatment. Therefore, patients who cough up phlegm, daily life should drink more water, do not eat spicy, stimulating food, appropriate physical exercise, if any discomfort, should go to the hospital in a timely manner to clarify the cause of the disease, and actively cooperate with the doctor for symptomatic treatment.