why does my eyelid keep twitching
Common Causes of Eyelid Twitching. Eye twitching, or myokymia, is an involuntary eyelid muscle contraction that usually affects the lower eyelid. The exact cause of eye twitching is unknown. A twitch sometimes develops during times of increased stress. Eye twitching has also been associated with high caffeine intake, fatigue, or excessive squinting.