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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.
Muscle twitching is absolutely a sign of anxiety, and one that can cause a great deal of distress. Usually the fear with muscle twitching is that it might mean something more. People worry that their twitching may not just be anxiety, and if it is, they worry that they can't control it.