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 gluteus medius is located in the hip and buttocks. It can contribute to pain in the low back, hip, buttock, and down the outside of the upper leg.
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 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 iliocostalis lumborum can contribute to pain in the lower back, hip, buttock and occasionally the abdomen. The pain is often a deep aching pain that feels as though it originates in the hip or buttock.
The iliopsoas muscles can contribute to lower back, abdomen, groin, upper leg, and pelvic pain. Standing from a sitting position is painful.
The iliocostalis thoracis muscle can contribute to pain in the chest, upper back, lower back, and abdomen. Pain tends to be more concentrated around the shoulder blade and / or low back kidney area.