Technically, any number of reasons can lead to muscular paralysis and spasm. As bastille stated, you could be suffering from malnutrition. You could also have physical nerve damage either due to minor stroke or necrosis.

Or it may just be as simple as your mind putting too much nervous energy into a perfectly healthy part of your body.

So there may not even be anything wrong with you. It may just be your mind paralyzing you.

In oriental medicine, specifically Daoism, we train the mind and use moxabustion to overcome these issues. BUT we do ofcourse eat well and take herbal elixirs to rapidly nourish.

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