Which of the following is considered a common contributing factor to temporomandibular disorder (TMD)?

• A. Posture
• B. Genetics
• C. Age
• D. Blood Type

Answer: (A)

Posture is a common contributing factor to TMD because the jaw doesn’t function in isolation—the head, neck, and upper back all influence how the jaw sits and moves. When posture is poor, especially with forward head position or rounded shoulders, neck and shoulder muscles stay tense and can drag the jaw into positions that increase load and strain on the TMJ and the surrounding muscles (masseter, temporalis, and pterygoids). This sustained muscle tension and altered jaw alignment can promote clenching or grinding, fatigue, and irritation of the joint, leading to pain and limited jaw movement. Because posture is a modifiable factor, addressing it can help reduce symptoms and prevent progression.

Genetics and age may affect overall susceptibility, but they are not typically considered common, direct contributors in the way posture is. Blood type has no established link to TMD.