Novel coronavirus pneumonia has to be detected by professional means, and there is no self-testing method. If you feel discomfort or have a history of exposure to the virus and suspect that you are at risk, you need to protect yourself, avoid public transportation, and go to a professional testing facility for testing. If the nucleic acid test is positive, the diagnosis of novel coronavirus infection can be confirmed, and in addition, it can be judged by combining imaging tests and nucleic acid gene sequencing. You can speculate the possibility of having novel coronavirus pneumonia by your own specific situation and the performance of your body: 1. History of exposure: If you have been to an area with high risk of novel coronavirus pneumonia within 14 days, have been in contact with a patient who has had novel coronavirus pneumonia, and have eaten food with novel coronavirus detected, you may be sick, and you should report this to the relevant authorities and do nucleic acid testing in isolation in time. 2, the emergence of symptoms: the emergence of unexplained low or high fever, abnormal weakness, cough can be accompanied by coughing sputum and dry cough and other major symptoms, or have nasal congestion, runny nose, sore throat, muscle pain and other such cold-like symptoms, as well as other atypical symptoms, such as chest tightness, breathing difficulties, etc., to promptly go to the local fever clinic. The above-mentioned conditions can only roughly determine the possibility of having novel coronavirus pneumonia, but it may also be caused by other diseases. In addition, people who have a history of living in infected areas and those who have been in contact with patients with novel coronavirus pneumonia do not always get sick. In addition to direct or indirect contact, novel coronavirus pneumonia is also related to the level of resistance of the body, so it is necessary to raise awareness of precautions.