Our expert says:
The cracking sound is caused by the slipping of the cartilage over each other. One would obviously not want to cause unnecessary friction and erosion of the surfaces over years, so I would advise you to try and stop the habit if possible! There is nothing you can do and neither do you have to worry about "naturally" creaking joints. It may help to take supplements like Glucosamine/Chondroitin (OsteoEze).
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