Clinical symptoms of Omicron Virus infection are categorized into common and rare symptoms. 1. Common symptoms: dry cough is a common symptom, which will cause patients to feel phlegm in the throat but unable to cough it out, which is difficult to bear; Omicron viruses will also cause patients to feel as weak as colds; muscle aches and pains, generally generalized aches and pains, which are similar to colds and flu, and fever, sore throat, and difficulty in breathing may also occur. 2. Rare symptoms: some patients may have headache, which is not common; some patients may have runny nose, and may even sneeze; there are also symptoms such as loss of taste or smell. Omicron Virus is highly contagious and it is recommended that patients actively do the relevant preventive work.