Mild cases of new crown infections are not serious, and there are even asymptomatic infections. It is only in severe cases that dyspnea and/or hypoxemia develops within a week or so. Mild cases usually have only mild clinical manifestations, such as cough and fever, and asymptomatic infections can be asymptomatic and can be cured with symptomatic treatment without becoming severe. Severe patients, in the initial stage of the disease, there will be fever, cough, generalized weakness, about 1 week after the onset of the disease, the symptoms will not be reduced, but rather, respiratory distress, cyanosis, and even shock, due to the new Coronavirus attack on the lungs and cause a waterfall chain of inflammatory response. Various life-supporting measures are needed to maintain the stability of the disease. If the symptoms fail to improve or even worsen gradually, it is necessary to consult a regular hospital in time, and cooperate with the doctor to improve the examination and standardize the treatment.