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Why do joints crack?

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Joints can crack when a negative pressure pulls nitrogen gas temporarily into a joint, such as when you pop your knuckles. It's not harmful.

You may also hear a "cracking" sound when tendons snap over tissues because of minor adjustments in their gliding paths. This happens more as you age, when your muscle mass and how they move change.

Joint Cracking from MedicineNet

Reviewed by David Zelman on January 08, 2018

Joint Cracking from MedicineNet

Reviewed by David Zelman on January 08, 2018

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What does it mean if your joints hurt when you crack them?

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