How do trigeminal neuralgia and TMD pain differ in onset, quality, and triggers?

• A. They are identical
• B. Both are triggered by chewing
• C. Trigeminal neuralgia features brief, severe, electric shock-like unilateral facial pain triggered by light touch or facial movement; TMD pain is dull/aching, worsened by jaw activity and muscle tenderness
• D. Trigeminal neuralgia pain is dull; TMD is sharp

Answer: (C)

Trigeminal neuralgia and TMD pain differentiate most clearly in how the pain starts, what it feels like, and what triggers it. Trigeminal neuralgia produces sudden, brief bursts of intense, electric‑shock–like pain on one side of the face. These paroxysms can be brought on by very light contact or facial movements such as smiling, shaving, or brushing the skin—tiny stimuli can trigger a sharp attack. In contrast, TMD pain is usually a dull, aching, or pressure-like discomfort centered around the jaw muscles or the temporomandibular joint. It tends to be related to jaw use—chewing, talking, clenching—and is often accompanied by muscle tenderness and sometimes stiffness or limited movement, rather than sudden, brief jolts.

So the best description aligns with: trigeminal neuralgia having brief, severe, electric-shock–like unilateral facial pain triggered by light touch or facial movement, and TMD pain being dull/aching and worsened by jaw activity with muscle tenderness. The other statements don’t fit because they either claim they’re identical, incorrectly state what triggers them, or reverse the typical pain quality.