The shadows in the lungs are generally not yet phlegm, they are swollen, inflamed lung tissue. If you want the inflammation in the lung tissue to go away, you can do it by expelling the phlegm. It is like a swollen piece of skin, the swollen piece is not pus, the last pus out of the pus, out of the pus is the secretion, phlegm is similar to the process of drainage of pus. If the phlegm discharge is smooth, the inflammation in the lungs can get better relatively quickly. In addition, there are phlegm clots in the airways, which can occasionally be seen on imaging and have a fixed shape. If a sputum plug is detected, it can be discharged from the mouth with increased respiration using phlegmolytics, which have a cylindrical shape, elastic and slightly hard.