Most common patients infected with COVID-19 have fever, dry cough, chest tightness, asthma, fatigue, expectoration and possibly hemoptysis. No symptoms of upper respiratory tract infection such as nasal congestion, runny nose, sore throat and throat discomfort are rare. Some patients may have symptoms such as anorexia, abnormal taste, loss of sense of smell, a few accompanied by gastrointestinal discomfort such as abdominal pain, diarrhea, nausea and vomiting, and some patients are asymptomatic, which is called asymptomatic infection. The average age of infected patients is 49 years old, and they are accompanied by basic diseases, including diabetes, hypertension and cardiovascular diseases. Severe patients are obviously older and accompanied by more potential diseases. Most of them developed dyspnea and hypoxemia after 1-2 weeks. Usually, most patients infected with novel coronavirus belong to mild and common types, and a few severe and critical patients can rapidly develop into acute respiratory distress syndrome and may eventually die. The main target organ of novel coronavirus infection is lung, but the research results show that novel coronavirus may also involve other organs. If you have symptoms similar to those mentioned above and have a history of contact with novel coronavirus, you need to do a good job of protection and go to the hospital for screening in time to find out whether there is the possibility of novel coronavirus infection. If it is diagnosed, it needs to be treated as soon as possible so as not to delay the illness.