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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.
When pressing on trigger points, many people feel no pain or discomfort. Sometimes, trigger points become very sensitive, and some people feel significant pain in areas where they have trigger points. Research indicates that no one really knows what the exact tissue is that makes you feel trigger points. It is also unknown why some people feel pain when touching muscle knots and some people do not. There are two types of trigger points that physical therapists treat: active and passive trigger points.