However, whether that “pop” sound is caused by the gas bubbles themselves or something else is hotly debated. DeStefano, D.O., chairwoman of the Department of Osteopathic Manipulative Medicine at Michigan State University, tells SELF. ![]() The existence of this gas isn’t up for debate-it actually shows up on X-rays and MRIs before surrounding tissues quickly reabsorb it after you crack your back, Lisa A. The thinking is that as these gases shift during an extreme stretch, they emit a cracking noise as they dissipate, Dr. When you apply force to your joints, those gases are rapidly released, according to the Library of Congress. ![]() ![]() This gas comes from a lubricant inside your joints known as synovial fluid-which contains oxygen, nitrogen, and carbon dioxide-that helps give nutrients to the cartilage in your joints to help them glide smoothly. We’re not talking about the same kind of gas that escapes from your body after eating a particularly bean-heavy chili (though that can be similarly satisfying to cracking your back). ![]() The most widely accepted one involves pockets of gas that like to hang out in your joints.
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