Occasionally cracking your knuckles or other joints is very common and usually not harmful. If it is accompanied by pain or swelling or follows an injury, it may be caused by an underlying condition.

Joints often crack due to harmless gas bubbles in fluid or tendons moving over bones. While usually normal, persistent pain, swelling, or stiffness could signal arthritis or injury. Staying active, ...

When someone stretches or bends their knuckle to crack it, they increase the space between the bones, which creates a drop in ...