Left eyelid twitching is considered to be caused by facial muscle spasm, eye diseases, localized epilepsy and other reasons, the specific causes should also go to the hospital for examination to confirm. 1. Facial muscle spasm: when the local nerve function of the left eye is abnormal, excessive eye use or mental tension caused by eye muscle spasm, which is manifested in the symptoms of left eyelid twitching. 2. Eye diseases: when the long time incorrect use of the eye and external stimuli caused by local infections, so that the eye disease, such as conjunctivitis, keratitis and other symptoms, which can lead to the symptoms of left eyelid twitching. 3. Localized epilepsy: It is a syndrome of brain dysfunction caused by abnormal discharges of neurons in the brain, which can lead to symptoms such as twitching of the corners of the mouth, twitching of the eyelids, and crookedness of the corners of the mouth, which can lead to the symptom of left eyelid twitching. When the symptoms appear, it is recommended to go to the hospital in time for relevant examinations and targeted treatment according to the doctor’s instructions as well as the individual’s physical condition.