Anybody know where does this crack come from?

  • Hi,

    When I put both of my hands behind my back, and then I push my head against my hands, I heard this crack sound (and of course, a relief). This doesn't happened every time, but only when I am tired (I can only do that 2 - 3 times a day).

    I can also lay down on my bed and does that.

    So, I would like to know:

    1. Where the crack comes from? Is it my upper back? Neck/spine joint? Bottom neck?
    2. Is it muscle sound or joint sound? Which muscles got stretched?

    Thanks a lot! 🙂

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