After the occurrence of novel coronavirus pneumonia, it is usually heavier about a week after the onset of the disease, because at the beginning of the onset of the disease, mainly for the upper respiratory tract manifestations, such as fever, cough, malaise, can be accompanied by upper respiratory symptoms such as sneezing, runny nose, sore throat, or gastrointestinal tract diarrhea, nausea, one week later there will be a pneumonitis, because of the alveolar exudates in the lungs, inflammatory reaction occurs, so there will be a fever, respiratory distress, wheezing, respiratory distress syndrome, and also septic shock, difficult to correct acidosis, or coagulation disorders. suffocation, respiratory distress syndrome, but also septic shock, difficult to correct acidosis or coagulation disorders. If the disease is effectively controlled, recovery occurs at the end of 2-3 weeks. If the patient has an underlying disease, the course of the disease is longer may reach 3-4 weeks, so usually the new coronavirus pneumonia on the seventh day is more serious. Source: Dr. Yurai