A leg twitch is mainly seen in the following cases: a. If a patient with previous cerebrovascular disease, such as cerebral infarction, cerebral hemorrhage or ischemic-hypoxic encephalopathy, has a twitch, consider that the patient has secondary epilepsy, manifesting as focal seizures, and can go to the hospital for an electroencephalogram to clarify whether there are spikes or sharp waves; b. Ask the patient if there is excessive leg movement, such as long-distance running. Some patients are prone to increased muscle excitability after excessive exercise, manifesting as transient muscle fiber tremors, which can manifest as leg a jerk; third, if a patient with cerebrovascular disease has hemiplegia, there is increased muscle tone on the hemiplegic side, and there will also be myoclonus, which can manifest as leg a jerk.