What is a true characteristic of trigger points?

Trigger points are hyperirritable spots within skeletal muscle that can lead to various symptoms, including localized pain and referred pain in other areas. One of the defining characteristics of trigger points is their ability to activate trigger points in nearby or associated muscles. This phenomenon occurs because when a trigger point is stimulated, it can refer pain and increase tension in surrounding muscles, potentially creating a cascade of trigger points in multiple muscles. This interconnectedness is key in understanding how myofascial pain syndromes develop, as one trigger point may contribute to others through muscle activity and referral patterns.

In contrast, the other characteristics listed do not accurately describe the nature of trigger points. For instance, the existence of trigger points is not limited to one muscle at a time; multiple muscles can have concurrent trigger points. Additionally, while trigger points are often associated with pain, they are not always palpably painful in every individual. Moreover, trigger points do have physiological effects, such as influencing muscle function and causing local ischemia or altered blood flow. Recognizing the interactive and dynamic nature of trigger points is essential for effective assessment and treatment in clinical practices.