There is no authoritative medical evidence that Omicron can damage the brain. Prevention is the key to dealing with omicron infection. Omicron is a variant of a new coronavirus that has spread widely around the world. According to research data from around the world, omicron is mild and similar to the flu. Infection can cause symptoms such as fatigue, dry cough, fever and limb pain, as well as shortness of breath, headache, sore throat and runny nose. Symptoms of omikron infection are mainly respiratory, and in severe cases, it can cause serious damage to the lungs, as well as symptoms such as pulmonary fibrosis and dyspnea. There have been no reports of Omicron directly affecting the senses of taste and smell and damaging the brain, and further data and experiments are needed. The infectiousness and pathogenicity of omicron is still unknown and we should not take it lightly. We should wash our hands frequently, wear masks, avoid places where people gather, and keep up to date with the new crown vaccination.