The erector spinae muscles are constantly working - most people will develop trigger points here - a common and easily treated cause of back pain
The Iliocostalis and Longissimus are both very long back muscles that run parallel with the spine.
Pain from active trigger points is typically referred downwards into the lower, mid and upper the back.
These muscles are used almost all the time when you are awake, as they are important "posture" muscles.
It is this constant activity that makes them so vulnerable to developing active trigger points.
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