Trigger points are a symptomatology of a myofascial pain syndrome resulting from local hypoxia due to various overloads in the muscle and the surrounding fasciae.
In order to understand the phenomenon of trigger points we will first go into the term myofascial. It is composed of the prefix myo-, from the Greek for "pertaining to the muscle," and the word fascial, which refers to the fasciae, or connective tissue structures. Together it refers to pain caused by a disruption of the muscles and surrounding fascia.
One characteristic is noticeable hardening in the skeletal muscles, which we often perceive as knots. We are sure, you´ve had spots that caused you pain when you pressed them in with your thumb. These pressure-sensitive points are called trigger points.
They not only cause pain at the site of the induration, but they can radiate, which in turn makes it difficult to treat, since you often only diagnose and treat the painful area as the source.
So, for example, the source of shoulder pain can often be in the lower back, knees or even feet.
In addition, a twitching reaction may become apparent in response to pressure treatment of nodules.