Twitching of the lower eyelid of the left eye is commonly caused by overuse of the eyes, ophthalmologic diseases, facial muscle spasm and so on. 1. Excessive eye use: staying up late, using electronic products for a long time, reading in a dark environment and other bad eye habits can lead to excessive eye use, causing visual fatigue. Excessive fatigue leads to abnormal excitation of the eye nerves, driving eyelid fluttering. 2. Ophthalmic diseases: when patients suffer from keratitis, conjunctivitis, photophthalmitis and other ophthalmic diseases, the eye is stimulated by abnormal nerve excitation, driving the eyelid spasm, manifested as eyelid twitching. 3. Facial muscle spasm: when the cerebral nerve is damaged, it can lead to facial muscle spasm, thus causing the phenomenon of twitching of the lower eyelid. The twitching of the lower eyelid of the left eye may also be caused by other reasons, the patient should go to the hospital in time, according to the diagnosis and guidance of professional doctors to carry out the relevant treatment.