Most of the new pneumonia coughs do not have sputum, but in fact, pathologically speaking, there is an inflammatory storm in the lungs, there should be a large shadow from the CT, there should be sputum, but sputum is very difficult to come out of the patient’s lung tissue there is a large amount of mucus, and it is very viscous, so it hinders breathing, oxygen through the respiratory membrane can not get into the bloodstream, and so it results in respiratory failure. If the sputum can be discharged, it should be able to relieve the patient’s respiratory difficulties, alleviate the lack of oxygen, there is a large amount of sputum inside the lungs can not be discharged, is the main reason for the exacerbation of the disease, coughing is not able to effectively discharged sputum, determines in the severe disease can not be able to recover, and do not develop into a critical condition, completely to the point of the patient is almost no ability to discharged sputum in the critical care, is the disease aggravated to the end of the main reasons for the bad treatment. Source: Dr. Yurai