The jumping of the left eyelid is the result of the involuntary twitching of the orbicularis oculi muscle of the left eye, which may be the physiological jumping caused by high physical labor and other conditions, or it may be caused by ocular lesions. If the recent high physical labor or long-term late night, a lot of smoking, drinking or the existence of excessive stress, mental tension and other conditions, can lead to the orbicularis oculi muscle physiological involuntary twitching, can be relieved after appropriate rest. Astigmatism, conjunctivitis, keratitis, inverted eyelashes, eye infections and other ophthalmic diseases can affect the nerves that innervate the orbicularis oculi muscle in the left eye, resulting in a constant twitching of the left eyelid. In addition, if you suffer from eye or cranial tumors, the larger size of the tumor can compress the nerves that innervate the orbicularis oculi muscle, causing the eyelid to jump all the time. If your left eyelid keeps fluttering, it is recommended to consult a doctor for a clear diagnosis.