A fever in the body is not always a new crown pneumonia. When the body has a fever, it may be caused by a cold, other systemic infections. If the infection of new coronavirus pneumonia is ruled out, it is important to consult a physician for further tests to clarify the cause of the fever. In addition to fever, patients often have respiratory symptoms, such as cough, sputum, shortness of breath, dyspnea, etc. Taking into account the patient’s clinical symptoms and epidemiologic history of exposure, patients should undergo a nucleic acid test for novel coronavirus pneumonia to make a definitive diagnosis. If the nucleic acid test is negative, neocoronavirus pneumonia can be excluded. If the nucleic acid test is positive, the case is confirmed. When the patient’s nucleic acid test is negative and the new coronavirus pneumonia has been ruled out, the patient’s fever often suggests that there is an infection in the body, so it is important to consult a doctor in time to further check what causes the fever, which can be carried out by a variety of tests, such as routine blood tests, C-Reactive Protein, Calcitonin Protein, and CT of lungs, etc., to find out the cause of the fever and to carry out targeted treatments. Note: The terms “new coronary pneumonia and new coronary virus pneumonia” mentioned in this article were renamed to “new coronary virus infection” on December 26, 2022, as announced by the National Health Commission.