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Nervous tension immediately tightens every muscle and nerve in the body and restricts the normal action and free and rhythmic flow of the various circulations. It holds the poisons in the body preventing their free exudation and by their presence creates more poisons.
A body that becomes overly stressed (stress-response hyperstimulated) can cause the nervous system to behave erratically, which can cause nerve impulses to fire erratically. Since nerve impulses control muscles, an erratically behaving nervous system can cause muscles to twitch. As long as the nervous system is even slightly overly stressed, it can cause erratic muscle twitching.