Why your shoulder may click or pop when you move it? Here are some possible explanations: Tendons sliding over bones: Your shoulder joint is a complex network of bones, muscles, and tendons. Sometimes, the tendons in your shoulder can slide over the bones in the joint, producing a clicking or popping sound. This is often harmless and nothing to worry about. Rotator cuff injury: The rotator cuff is a group of muscles and tendons that surround the shoulder joint. If you've injured your rotator cuf