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THERE ARE SEVERAL CAUSES of trigger points. These include direct trauma (an accident or injury), unusual exertion and repetitive strain. Direct trauma involves impact, as from a fall, or an automobile or skiing accident.
Trigger points cause tightness in muscles, which in turn can pull on tendons and ligaments associated with the muscle and can cause pain within a joint where there are no muscles. There are more than 600 potential trigger points in human muscles.