Reasons Why My Eye Keeps Twitching

A diagnosis from my doctor.
  1. Lack of sleep
    I work all the time and when in not working I'm doing everything else. I fear running out of time all the time.
  2. Too much caffeine
    See above. But I'm making a conscious effort to cut back and do half-caff drinks to try and wean myself off.
  3. Stress
    See both above. I work too much. I worry too much. I don't sleep enough. I need to hike more.
  4. Vitamin D deficiency
    The twitching isn't a result of this but I thought I'd throw it in for good measure. Still perplexed by the fact that a girl who lives in sunny LA has low Vitamin D levels. Now I have to take vitamins. Could this lead to a serious condition?