Cracking neck
Don’t worry, all that creaking and cracking doesn’t mean you’re getting old. The neck is a series of paired joints, called facet joints. Each is filled with fluid and surrounded by a capsule. Bending your neck stretches the capsules, which decreases pressure on the joint fluid and causes it to turn into gas; the crack you hear is gas popping out of the joint fluid. Neck cracking is generally not harmful, but see a doctor if you experience pain-especially if it shoots down one arm. This could signal nerve root impingement, a pressure change of the nerve root that causes pain throughout the limb.(Related: A Guide to Neck Pain Symptoms, Causes, Treatments, and Relief)