Question:
Why do my bones often crack a lot every time I walk or exercise?
Answer:
There is fluid between your joints called synovial fluid. Its purpose is to keep your bones from rubbing against each other. There are dissolved gases in this fluid that sometimes pool together, and when the bubbles burst, you feel and hear them. This is common and not a cause for concern.
Your muscles are connected to your bones by ligaments and tendons. Sometimes, they slide slightly out of position and then snap back into position as you use that joint, making a snapping or clicking sound. This is a concern only if you experience pain, swelling, or difficulty moving the joint.
As people age, the cartilage at the ends of their bones begins to wear down. This causes the ends of the bones to rub against each other, making the joints stiff and causing grinding noises when the joint is used. This problem is always painful.