Omicron is also known as Omicron, and patients infected with the Omicron variant will experience respiratory symptoms, systemic symptoms, digestive symptoms, and so on. 1. Respiratory system: When patients are infected with Omicron mutant, the virus will enter the throat through the mucous membrane of the respiratory tract, and multiply and survive in the throat, which may cause irritation to the mucous membrane of the throat, resulting in respiratory symptoms such as nasal congestion, runny nose, coughing, sore throat, etc. Respiratory distress and hypoxemia may occur after the development of the severe disease. 2. Systemic symptoms: After infected with Omicron variant, patients may develop systemic symptoms such as muscle aches, generalized fatigue, headache and fever. 3. Digestive symptoms: Patients infected with Omicron variant may experience digestive symptoms such as nausea, vomiting, diarrhea, and loss of appetite. When patients experience the above uncomfortable symptoms they should go to a regular hospital for a new coronary nucleic acid test, and if they are diagnosed as infected, they should be isolated and treated according to local policy.