Experts explain why your eyelid twitches and how dangerous it may be

An eyelid that suddenly starts trembling can feel alarming, but specialists say the sensation usually reflects a brief, involuntary muscle contraction rather than a dangerous eye problem.

Doctors call the phenomenon eyelid myokymia. It occurs when fibers in the muscles around the eyelid twitch instead of simply contracting to close the eye. The movement often affects the lower eyelid and may last only briefly. In some cases, people feel a flutter even when no visible eye movement occurs.

Neurologist Alejandro Guillermo Andersson, director of the Buenos Aires Institute of Neurology, compares the sensation to having “a worm under the skin.” He says several parts of the eyelid can fasciculate or pulse, creating the impression that the movement is obvious when it may barely be visible.

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The body sometimes works like a car: when the engine heats up, a red light comes on to indicate that you need to stop.

The most common triggers are tiredness and stress. Anxiety and stimulating drinks, including coffee, tea and mate, can also produce myokymia. Cornea transplant specialist Rogelio Ribes Escudero says the symptom can serve as a sign that a person needs to slow down. “The body sometimes works like a car: when the engine heats up, a red light comes on to indicate that you need to stop,” he says.

Doctors distinguish myokymia from blepharospasm, a spasm involving the entire muscle around the eye that can force the eyelid to close completely and, in some cases, cause functional blindness. They recommend seeing an ophthalmologist for examinations and to rule out other diagnoses. Ribes Escudero says the symptom is a frequent reason for anxious patients to seek care because they fear something is wrong with the eye.

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A worm under the skin.