TMD is the most common chronic orofacial pain condition, characterized by changes in the temporomandibular joint, the masticatory muscles and surroundig structures, or both. It is considered to have a multifactorial etiology with several contributing factors that may be the cause or contribute to its chronicity, namely neurobiological, neuromuscular, biomechanical and psychosocial factors. The literature has shown a relationship between craniomandibular and craniocervical systems, showing a relation between TMD and postural factors. Concomitantly with TMD, there have been described several comorbidities associated with pain, like headache, whose pathophysiology seems to indicate the existence of common mechanisms. Psychosocial factors also seem to be related to TMD. For these reasons, it is important to study the relationship between these variables.