Ribs move out
A popped rib happens when the cartilage attached to any of your “false ribs” breaks, resulting in abnormal movement. It's this slipping out of normal position that causes pain that's felt in your upper abdomen or lower chest. In most cases, a popped rib is caused by injury or trauma.
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When a rib pops out of alignment, it can also cause the surrounding muscles and tissues to get inflamed. When the nerves in between the ribs get inflamed and irritated (often from rib subluxation), it is a condition that is called Intercostal Neuritis or Intercostal Neuralgia.
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