If you can’t cough up phlegm deep in the bronchial tubes, you can take oral medication, physical methods and assisted manipulation to help expel phlegm. 1. Oral medication: under the guidance of the doctor, patients can take drugs such as acetylcysteine and Ambroxol to dilute the phlegm and help coughing up phlegm. 2. Physical: Ultrasonic nebulization can be used to dilute the phlegm, which can be easily coughed up when the respiratory tract becomes moist. When nebulizing, you can also add appropriate amount of saline or acetylcysteine and other expectorant drugs to help expel phlegm faster. 3. Auxiliary techniques: This refers to back patting and coughing up phlegm, so that the patient is in a semi-sitting position, and then from the outside to the inside, from the bottom to the top of the back patting, through the vibration of the way to achieve the purpose of letting the patient cough up phlegm. Bronchial phlegm but can not be discharged, will cause a series of physical effects, it is recommended that patients seek medical attention in a timely manner, under the guidance of the doctor, to take corresponding measures to help discharge phlegm.