What causes cramps when yawning?

TMJ is an initialism for Temporomandibular Joint syndrome or disease – but really means a tense jaw. These joints connect the lower jawbone to your skull. When your TMJ becomes inflamed due to overuse or stress, pain can be present during chewing, speaking, swallowing, and yawning.

Why do I get cramps under my chin when I yawn?

Yes, temporomandibular joint disorders, or TMJ disorders can cause jaw spasms. An unstable joint from TMJ dysfunction causes increased strain and tension to the muscles responsible for talking, chewing, swallowing, yawning, and other movements.