Why does my neck crunch when I roll my head?

Understanding Neck Crunching

Two common benign explanations for the crunching sound when you roll your head are the release of air from the synovial fluid that provides cushioning and lubrication to the joints, as well as tight ligaments snapping between bones. Generally, it’s not necessary to take any action regarding the noises your neck produces during movement, unless accompanied by pain or swelling.