Quadratus lumborum
Body region：Lower back
One-sided flank pain, worse with bending or coughing
Function
Originates from the iliac crest and inserts at the 12th rib and the transverse processes of the lumbar vertebrae. Side-bends the lower back and stabilizes the pelvis.
Common causes
Carrying weight on one side, standing on one leg for long periods, a difference in leg length, or prolonged sitting.
Massage and stretching
- Side-lying press on the side of the waist
- Side-bend stretch
Related acupoints
- Shenshu (BL23)：About 1.5 cun lateral to the 2nd lumbar vertebra, roughly level with the navel at the back
- Dachangshu (BL25)：About 1.5 cun lateral to the 4th lumbar vertebra, on the line joining the highest points of the iliac crests
Related meridians
Bladder Meridian of Foot-Taiyang
Posture and muscle patterns
When to see a doctor：Numbness or weakness in the legs, loss of bladder or bowel control, injury or fever: seek medical care immediately.