Distinguishing BFs from Tremors

twitch is a muscle contraction and tremor is more like a shaking movement.. like your hand...if it shakes when its relaxed thats a tremor..a twitch is a small muscle movement under the skin
 
I don't know exactly if I have tremors, but my hands shake a bit when I hold them out, not always but many times. If I work in the garden, I'll notice many times that my arms are shaky, like I've overused the muscles. Just add another one to the list!
 
My question is: is muscle trembling when you use your muscles, even slightly, considered weakness? for example, when I smile my facial muscles start to tremble. This happens when I use other muscles as well, not even with much exertion. It also seems that my arms ache when I hold things up such as the phone. I am worried that these could be the beginning signs of weakness. Has anyone ever asked their neuro these questions?
 

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