But how does a jaw disorder result in migraines? The answer lies in the complex network of nerves that run through the temporomandibular joint. The trigeminal nerve, one of the primary facial nerves, has a significant branch running through the TMJ and happens to be a crucial nerve involved in headache disorders. When TMJ becomes misaligned or stressed, it irritates this nerve, which can lead to persistent headaches and migraines. Besides nerve strain, TMJ disorder can also cause muscle tension around the neck and head, another common cause of migraines.