The left eye is usually a spasm of the eyelid muscles, and there are a number of specific causes that need to be identified. Most eyelid muscle spasms are caused by abnormal discharge of nerve endings, or they may be caused by eyelid muscle fatigue. The specific etiology may be the following: first, overexertion, which can lead to eyelid muscle fatigue and cause abnormal nerve function, resulting in eyelid muscle spasm; second, the effect of medications or mental tension or stress, which can cause abnormal nerve function and cause eyelid muscle spasm; third, excessive intake of caffeine-based substances, such as tea and coffee, which can cause abnormal nerve excitation, resulting in eyelid muscle spasm; and fourth, serum electrolyte Fourth, abnormalities in serum electrolytes can cause abnormalities in the function of the nervous system, which in turn can cause eyelid muscle spasm; fifth, diseases of the nervous system itself, such as neurological dysfunction syndrome, trigeminal neuralgia, and intracranial occupations; and sixth, vascular factors, which cause abnormalities in the function of the facial nerve due to vascular compression, which in turn can cause eyelid muscle spasm. In summary, there are many causes of eyelid muscle spasm, and what is going on with the left eye that keeps jumping requires a visit to the hospital to improve the relevant examination, find out the cause, and then treat it symptomatically.