Temporomandibular Joint Disorder (TMJ) / Bruxism Secondary to Post-Traumatic Stress Disorder (PTSD)

Yes. Under 38 CFR § 3.310(a), any disability proximately caused or chronically worsened by a service-connected condition is itself service-connected. Temporomandibular Joint Disorder (TMJ) / Bruxism is a documented secondary pairing for Post-Traumatic Stress Disorder (PTSD) with moderate medical evidence. A nexus letter from a qualified physician linking the two conditions is the most reliable way to establish this connection.

The gold standard is a private nexus opinion stating — to at least a 50% probability ("at least as likely as not") — that the secondary condition was caused or aggravated by the primary service-connected condition. Peer-reviewed medical literature supporting the physiological mechanism strengthens the nexus. Treatment records documenting the onset or worsening of the secondary condition in temporal relation to the primary are supporting evidence.

The VA rates Temporomandibular Joint Disorder (TMJ) / Bruxism separately under its own 38 CFR Part 4 diagnostic code, then combines it with Post-Traumatic Stress Disorder (PTSD) and all other service-connected ratings using the combined ratings formula under § 4.25. The formula applies the whole-person concept: a 50% combined existing rating plus a new 30% rating yields 65% (rounded to 70%), not 80%.

38 CFR § 3.310(a) states: "Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected." The aggravation variant under § 3.310(b) applies where the primary condition permanently worsens a pre-existing disability beyond its natural progression. Both standards require a showing of nexus — a medical or scientific link between the primary condition and the secondary.

The medical evidence supporting Temporomandibular Joint Disorder (TMJ) / Bruxism as secondary to Post-Traumatic Stress Disorder (PTSD) is rated moderate. PTSD causes sustained elevation of physiological arousal that manifests as chronic muscle tension, including masseter, temporalis, and pterygoid muscle hypertrophy and bruxism (involuntary teeth grinding/clenching). PTSD-associated hyperarousal during sleep drives nocturnal bruxism, the primary cause of TMJ derangement, articular disk displacement, and myofascial pain. Elevated cortisol and norepinephrine in PTSD increase muscle tone throughout the body, and the jaw muscles are particularly affected given their proximity to the brainstem areas (locus coeruleus, raphe nucleus) dysregulated in PTSD. Prospective studies in veterans confirm the PTSD → bruxism → TMD pathway.

The VA will not solicit nexus evidence on your behalf for secondary claims. In practice, a written nexus opinion from a private physician or independent medical examiner is essential — the VA's Compensation & Pension (C&P) examiner is not required to produce a favorable nexus opinion, and the VA has discretion to weigh competing opinions. Submitting a private nexus letter at the time of filing is the most reliable strategy.