Currently, the main symptoms of being positive for the new coronavirus are cough, low-grade fever, malaise or mild cold symptoms. However, there are also patients with no apparent symptoms, called asymptomatic infected persons, who are equally viral. The new coronavirus is a rapidly mutating virus of the genus β coronavirus, which is currently circulating. Symptoms and the risk to the human body vary according to the type of virus and the vaccination status. There are four types of neocoronavirus pneumonia, namely, mild, common, severe and critical, and the symptoms of each are different. 1. Mild type of Neocoronavirus Pneumonia: It is more common in the clinic. Patients with positive nucleic acid test usually only have low-grade fever, malaise or mild flu symptoms, and there is usually no typical manifestation of pneumonia through imaging. 2. Ordinary type of neocoronavirus pneumonia: patients with positive nucleic acid test, the main symptoms are fever, dry throat, cough, sputum and sore throat and other respiratory symptoms, through the imaging examination will usually find pneumonia manifestations. 3. Severe neocoronavirus pneumonia: patients with positive nucleic acid test usually have symptoms such as dyspnea, decreased sense of smell and taste, etc. Imaging examination usually reveals that the pneumonia foci have progressed significantly within a short period of time. There are more patients in this category before vaccination. 4. Critical neocoronavirus pneumonia: patients with positive nucleic acid test, older patients, severe underlying diseases, usually with symptoms of respiratory failure, septic shock and multi-organ failure. Tips] In this article, “new coronavirus pneumonia” and “new coronavirus pneumonia” have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.