A frequent source of lower-back pain comes from two muscles you might not have heard of—and that makes sense since you rarely see them on those medical posters of human anatomy in doctor's offices.
Verywell Health on MSN
Causes of muscle pain
Medically reviewed by Scott Zashin, MD Key Takeaways Muscle strains can happen when a muscle is overstretched and may feel ...
MRI shows selective psoas and rectus atrophy with reduced trunk strength in chronic low back pain, suggesting functional imbalance.
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