The currently prevalent New Crown virus is the Omicron variant, which is characterized by fever, dry cough, sore throat, headache, malaise, nasal congestion, muscle aches, and night sweats (sweating abnormally after going to sleep, which stops when you wake up). Nowadays, the main symptom of the new crown caused by the Omicron variant strain remains fever and is predominantly moderate. Patients have atypical upper respiratory symptoms, such as cough, sputum or dry cough, which are not significantly different from other respiratory diseases. Gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea) were also less frequent than in the past. The Omicron variant is a variant of the new coronavirus, which is more insidious and transmissible, but has relatively mild symptoms of infection and relatively fewer severe cases. The milder symptoms are related to both the popularity of vaccination and the reduced virulence of the omicron variant strain itself, and should not be assumed simply that the omicron variant strain is less virulent. If there is a history of exposure to the virus and the symptoms described above, prompt medical attention is recommended.