Mild bronchiectasis is not very serious, but it mainly depends on whether it is hemoptysis and the size of the pus cavity. If the cyst is particularly large, even if it is not serious at the time, the chance of development is particularly high, because the larger the cyst is, the more pus is stored inside it, so it is not easy to drain it. There is also the bronchial dilatation, if hemoptysis, is particularly easy to aggravate, because once the bleeding, the phlegm itself contains bacteria, in the blood is more mobile, easy to the next better, no inflammation of the lung tissue to invade, so the bronchial dilatation is to use this method to infect other places, because with the bacteria of the kind of mobile phlegm is more harmful, if you can do in a timely manner through the lung or It is a chronic infectious disease, sometimes it develops for decades, and it creeps forward little by little, even some people if the pus inside the bronchial dilatation is completely drained, the bronchial dilatation can be completely stationary and does not develop, it depends on the strength of the sputum draining at that time, so go to the hospital to treat such a disease as bronchial dilatation, doctors are very focused on the draining of sputum, they will teach you to drain, tell you to drain, tell you to drain. They will teach you drainage and tell you which position is easier to get the phlegm out.