What makes the sound when your back cracks while stretching, and why can’t the sound be made again until later when it needs to be cracked again?
In: Biology
You may actually be re-positioning the discs between the bones in your spine. You can’t do it again until the discs have settled out of position again. I know this because I had to have 3 discs removed from my spine and the 4 bones surrounding them fused together.
You can see a video of the bubbles forming in this [article](https://www.google.com/amp/s/www.wired.com/2015/04/watch-gross-mri-knuckle-cracking/amp).
In each joint there are gasses. These gasses can get released when the joint gaps. It’s nitrogen gas that gets released. The joint doesn’t fill up with gas again until 30-60min after you “crack” it
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