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Muscle twitches: why they happen and what they mean

By Adam Taylor, Professor of Anatomy, Lancaster University

You’re relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it’s a muscle in your arm, your leg, or your foot that begins to spasm – sometimes for a few seconds, sometimes for hours or even days. It’s an unsettling sensation that affects about 70% of people at some point in their lives.

Muscle twitches fall into two main types. There’s myoclonus, where a whole muscle or group of muscles twitch or spasm. Then there’s fasciculation,…

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