Why do adjustments make a popping sound?
Safety & Evidence · answered by Dr. Alan S. Bader, DC — Chiropractic Physician.
Medically reviewed by Dr. Alan S. Bader, DC — Chiropractic Physician, Nevada License B-567 · Dr. Bader · Dr. Doyle · Last reviewed: July 2026
The short answer
The pop is gas cavitation — a small bubble forming inside the joint fluid as joint surfaces separate — captured on real-time MRI research (Kawchuk, PLOS ONE 2015). It's the same harmless physics as cracking knuckles. The sound isn't the treatment: the specific joint motion is, and some effective adjustments make no sound at all.
The full picture
Joints are sealed capsules with lubricating fluid. Quick stretch drops the pressure, dissolved gas comes briefly out of solution, and the cavity formation makes the audible pop — physics, not bones grinding or 'going back in place.'
Two useful corollaries: chasing the pop is pointless (patients sometimes feel cheated without it; the mechanical change is what matters), and self-cracking compulsively usually signals a restriction nearby that deserves an actual evaluation — the segment you crack is often the mobile one compensating for the stuck one next door.
Also, for the record: knuckle-cracking doesn't cause arthritis. That study's been done; grandma was wrong on this one.
Reference: Kawchuk GN et al., PLOS ONE 2015 — real-time MRI of joint cavitation.
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This page is education, not medical advice for your specific situation — an examination is how care decisions get made. If you may be experiencing an emergency, call 911. Full medical disclaimer.
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