why do charley horses happen? Like, how and why would muscles unconsciously contract? And also, would local anesthesia stop a charley horse?
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Lack of certain electrolytes usually. Mainly magnesium and/or potassium. Lack of those prevents your muscle fibers from relaxing properly and can cause painful cramping.
There are other causes, but that’s the common one.
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Another cause less known to most people…
A nerve impingement can cause cramping. The muscle thinks it is receiving a “contraction” signal, but that signal is not originating from the brain, it is coming from a pinch point.
In that case, some walking and stretching can cause it to relax.
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