Hearing a pop or click when you move a joint can be startling—but it’s often harmless. These sounds usually come from tiny gas bubbles forming and collapsing inside the joint fluid, or from tendons sliding over nearby bones during motion. This process, known as cavitation, is a normal part of joint mechanics.

Still, not all joint noises are the same. Popping that comes with pain, stiffness, or swelling can point to changes in how the joint moves, whether from inflammation, overuse, or early cartilage wear. Over time, these changes can affect joint stability and make movements less fluid.

Recognizing when popping is routine—and when it signals something more—is key to protecting joint health.

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