The precursor to a new crown may have no obvious symptoms, or there may be gastrointestinal symptoms, neurologic symptoms, cardiovascular symptoms, and other symptoms in the body. 1. Gastrointestinal Symptoms: A portion of patients with neocoronary pneumonia may present with precursor symptoms of digestive disorders, such as nausea, vomiting, and diarrhea. 2. Neurological symptoms: Since the virus will travel with the bloodstream to various organs of the body, the precursor of C.pneumonia may also include neurological symptoms such as headache, panic attacks, chest tightness, and so on. 3. Cardiovascular symptoms: Patients with high blood pressure, heart disease and diabetes may experience symptoms such as chest tightness and difficulty in breathing. 4. Other: Some patients may also experience conjunctivitis as a precursor to a new crown, which may be accompanied by mild muscle pain in the limbs or waist and back. However, most patients in the early stage will show fever, dry cough, fatigue, etc., may also be accompanied by nasal congestion, runny nose, sneezing, sore throat and other symptoms. If the above symptoms are similar, it is necessary to be alert to the possibility of infection with new crowns, and it is necessary to combine the clinical manifestations, epidemiologic history and imaging and pathogenetic examination to achieve early detection, early diagnosis and early treatment. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.