Many people’s knees squeak, crack, or crackle, a phenomenon known as crepitus. Most of the time, it’s no big deal at all. But a loud popping sound accompanied by pain and swelling indicates an injury.

Jaw popping refers to a clicking sound from the jaw, which can be accompanied by sensations of pain. Sometimes jaw popping can arise from overextending the jaw, such as by opening the mouth too wide ...

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, ...

We are starting to receive several complaints of "popping noise" generated by the PowerBook G4 17". MacFixIt reader Paul Gary accurately describes the problem: "When the initial chime starts, there is ...