Generalized weakness, dizziness, and leg weakness should be considered from three aspects. The first aspect is the posterior circulation ischemia caused by slow blood flow in the vertebral arteries and basilar arteries, which can lead to dizziness and, in severe cases, general weakness and weakness of the legs, as well as nausea and vomiting. The second aspect to be considered is the usual insomnia and sleeplessness or after staying up late, because of work and then more fatigue, the brain is overworked, it will cause the appearance of dizziness, general weakness, leg weakness, vomiting symptoms. The third aspect may be due to bacterial infection or viral infection, resulting in the emergence of symptoms such as cold and fever, will also be manifested as general weakness, dizziness, leg weakness, vomiting symptoms, it is recommended to visit the hospital for routine blood tests, if the increase in white blood cells is more obvious, consider the bacterial infection caused by the use of antibiotics to treat when necessary.