Twitching eyes, or "blepharospasm," according to WebMD, is a painless, generally benign spasm that can be caused by a variety of factors, but sometimes it has no apparent cause. A tendency toward eye twitching seems to run in families though no genetic source is known. Environmental causes include stress, lack of sleep and drug or alcohol consumption.Continue Reading
Doctors divide twitching eyes into three categories: minor eyelid twitching, benign essential blepharospasm and hemifacial spasms. Minor eyelid twitching, according to WebMD, is usually transient and almost always harmless. Its causes are not always obvious. Benign essential blepharospasm often involves both eyes and often begins with excessive blinking. As with minor eyelid twitch, benign essential blepharospasm is associated with stress and fatigue though it can also be triggered by exposure to wind and airborne particles.
Hemifacial spasms are more serious, notes WebMD, and they can be the sign of a serious medical condition, such as Bell's palsy. In contrast to the other two types of eye twitches, hemifacial spasms usually involve repeated, rapid contortions of one half of the face. Sometimes, such spasms are a sign that an artery in the skull is pressing against one of the cranial nerves that runs to the face.Learn more about Muscles