I got it from drinking too much caffine, I think I became alergic to it. Now I rarely drink it, but if I do go on a kick say for a few weeks, it will come back.
Other possible causes:
Staring at a monitor/tv all day
Lack of sleep
Stress
Low potassium (so I've heard)
i have had this as well. didnt realize it at the time, but i was going through a very stressful period. probably didnt notice bc i was so stressed out. lol
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