The fastest and most effective way to spit out phlegm includes coughing up phlegm correctly, patting the back and dissolving sticky phlegm. 1. Coughing up phlegm correctly, some people have not yet learned how to cough up phlegm and spit out phlegm, they need to first master the correct way of coughing up phlegm, coughing up phlegm with deep breaths and practicing, and then gradually mastering the correct way. 2. Patting the back, when phlegm is sticky, it is easy to be stained on the lungs or bronchial tubes, you need to make your hands hollow and pat the back repeatedly to help the phlegm fall off, and then you can cough out the deep phlegm effectively. 3. Dissolve mucous phlegm, part of the mucous phlegm due to the high concentration, can not be successfully coughed up, need to use acetylcysteine oral or nebulized way, dissolve mucous phlegm, can be successfully coughed up. Prompt medical attention is required, and prescription medications should be used according to medical advice.