The latissimus dorsi muscle can contribute to pain in the shoulder, upper back, and arm going down into the hand. The muscle can also cause pain in the side of the ribcage and lower abdomen. It is the muscle that most often causes the 'side stitch'.
The serratus posterior inferior muscle contributes to pain in the lower back between the bottom of the ribs and the top of the hip. Pain is increased when you twist the torso, bend over, and stretch to reach overhead.
The quadratus lumborum muscle is known for sharp pain in the lower back and aching hip pain. Contributes to pain in the buttocks, groin and abdominal areas.
The iliopsoas muscles can contribute to lower back, abdomen, groin, upper leg, and pelvic pain. Standing from a sitting position is painful.