I have had fasciculations for over a decade. It seems it comes in spurts and can occur all over. I have had them in the most unusual places. I assume it is part of the small fiber neurop. I have not really found anything that influences it, but then again, I haven't undertaken any real study of it. I may be incorrect, but it must involve some motor nerve activity, as a fasciculation is movement, not just sensory. I can see my muscles moving. Perhaps the sensory nerve is overactive and the result is signalling the motor nerve to contract the muscle. The generic term twitching can also imply a singular unintended movement of a body part, like a jerking. I get those too.

The docs don't really seem to understand this condition all that much, especially the idiopathic, so, I just assume most of my oddities are due to the condition.