The oblique muscles are often thought of as the waist muscles. They contribute to pain on your side in the rib cage and waist area, lower abdomen, groin, and pelvis. They can also contribute to heartburn, indigestion, bladder pain and incontinence, and testicle pain.
The pectoralis major contributes to pain in the chest, shoulder, breast and upper back. Pain can also travel down the inner arm, elbow and extend to the hand and last two fingers.
The rectus abdominis contributes to pain in the area around the sternum, across the upper back, across the buttocks, the lower abdomen, the pelvis. and testicles. It can also contribute to heartburn, indigestion, feeling bloated as well as mimicking urinary tract infection pain.
The iliopsoas muscles can contribute to lower back, abdomen, groin, upper leg, and pelvic pain. Standing from a sitting position is painful.