My left eyelid keeps twitching. Why?

Its called a Tic. Usually it doesn’t mean anything bad.

Wow! I’ve been thinking this for a few years now and I am so glad to hear confirmation (affirmation?). I finally put together that correlation and it seems to be true, though it’s slightly different every year (allergy season). Some years it’s extreme stuffy nose and other years it manifests as various twitches and other things. The physiology behind this must be fascinating.