Common causes of twitching under the eye include tiredness, stress and eye strain, explains All About Vision. In certain cases, lower eyelid spasms can indicate underlying neurological disorders, so it is important for sufferers to seek medical attention.
Additional causes of lower eyelid twitching include medication side effects, tobacco use and irritation of the eyelids, according to Healthline. Chronic eyelid spasms often indicate benign essential blepharospasm, a condition that causes uncontrollable movements of the eyelids. As of 2015, the specific cause of benign essential blepharospasm is unknown, but direct sunlight, wind, air pollution, dry eyes, stress and fatigue exacerbate spasms.