Eyelid twitching, also called eyelid spasm or eyelid myokymia, is an uncontrolled, involuntary contraction of the muscles in the eyelid. These can occur in the upper and/or lower eyelids of one or both eyes. They come on suddenly and can last for a minute, hours, days, or even longer. Also, while it may feel like everyone is looking at your twitch, most contractions are so small that they are not visible to someone else looking at your face.
Fortunately, the majority of eyelid twitches are harmless and do not affect your vision. The most common underlying reasons for eyelid spasms are:
- Excessive amounts of stress
- Fatigue or exhaustion
- Too much caffeine intake