<unk>  mostly affects people in the 20 – 40 age group, and the average age is 33.9 years. People with<unk>  tend to be younger adults, who are otherwise healthy. Within the catchall umbrella of<unk> , there are peaks for disc displacements at age 30, and for inflammatory-degenerative<unk>  disorders at age 50. About 75% of the general population may have at least one abnormal sign associated with the TMJ (e.g. clicking), and about 33% have at least one symptom of<unk> . However, only in 3.6–7% will this be of sufficient severity to trigger the individual to seek medical advice. For unknown reasons, females are more likely to be affected than males, in a ratio of about 2:1, although others report this ratio to be as high as 9:1. Females are more likely to request treatment for<unk> , and their symptoms are less likely to resolve. Females with<unk>  are more likely to be nulliparous than females without<unk> . It has also been reported that female caucasians are more likely to be affected by<unk> , and at an earlier age, than female African Americans. According to the most recent analyses of epidemiologic data using the RDC/TMD diagnostic criteria, of all<unk>  cases, group I (muscle disorders) accounts for 45.3%, group II (disc displacements) 41.1%, and group III<unk>  disorders) 30.1% (individuals may have diagnoses from more than one group). Using the RDC/TMD criteria,<unk>  has a prevalence in the general population of 9.7% for group I, 11.4% for group IIa, and 2.6% for group IIIa.
Temporomandibular joint dysfunction
Impacted wisdom teeth
Facial nerve paralysis
Eustachian tube dysfunction
Orofacial myofunctional disorders
Barodontalgia
Ear pain
Orofacial pain