Jaw pain is a broad term that refers to discomfort in the jaw area, which can stem from various causes, including muscle tension, dental issues, or problems with the temporomandibular joint (TMJ). The TMJ is the specific joint that connects the lower jaw to the skull, allowing for smooth movement during talking, chewing, and yawning. When this joint is affected, it can lead to TMJ pain—a distinct type of jaw pain often accompanied by clicking, popping sounds, or difficulty opening the mouth.