Muscle knots in the Mid-Level Iliocostalis Thoracis are located along the mid-back, between the lower and upper ribs, just lateral to the spine. These trigger points often refer pain to the mid-back, ribs, and side of the torso, and can feel like a dull ache, tightness, or even a band of discomfort wrapping around the ribcage. People often mistake this pain for rib dysfunction, intercostal neuralgia, or even lung-related issues, especially when it worsens with deep breathing, twisting, or prolonged sitting.