OrthoTrussPatient guides · understanding your health
Jaw pain & TMD
Understand the different conditions behind jaw pain, and why symptoms need context.
The essentials
TMD is a group of conditions
Muscle pain, joint problems and related headaches can overlap.
Pain has several influences
History, health and the way pain is experienced all matter.
Symptoms need context
A sound, scan or sore spot cannot establish the whole diagnosis.
Jaw pain is an experience, not a diagnosis. TMD can involve the chewing muscles, jaw joints or both; conditions may overlap. Persistent pain, locking or difficulty opening deserves assessment, and facial pain can have causes outside TMD.[1]
A little more understanding.
What is the difference between TMJ and TMD?
TMJ names the jaw joint. TMD is the name for a group of disorders involving the joints and chewing muscles.
Read a little more: What is the difference between TMJ and TMD?
You have a temporomandibular joint on each side, where the lower jaw meets the skull. “TMJ” describes that anatomy; “TMD” describes disorders rather than one disease. A label such as “TMJ pain” is therefore only the beginning of an explanation.[1]
What kinds of problems are included?
Clinicians distinguish muscle pain, joint pain, problems within the joint and headaches attributed to TMD. More than one can be present.
Read a little more: What kinds of problems are included?
- Muscle pain — myalgia
- Pain involving the chewing muscles. Myofascial pain is a muscle-pain term that may include pain spreading beyond a local sore area.[2]
- Joint pain — arthralgia
- Pain attributed to the jaw joint. Joint pain and changes within the joint are related but distinct diagnostic questions.[3]
- Problems within the joint
- These include conditions affecting the disc or joint tissues. A finding on imaging does not describe someone’s full pain experience.[1]
- Headache attributed to TMD
- This is a specific diagnostic category, not a label for every headache in a person with jaw symptoms.[3]
What might someone notice?
Aching, tenderness, painful movement, stiffness or locking can occur. A painless click by itself is different from a painful or restricted jaw.
Read a little more: What might someone notice?
Muscle-related symptoms can include aching or tired chewing muscles, tenderness and pain when chewing or opening. Pain may also be felt around the temples, face or neck.[2]
Painless clicking is common. Painful clicking, locking or a change in comfortable movement provides different information and should be described during an assessment.[1]
Why does TMD develop?
There is usually no single explanation. Studies examine interacting health, psychological and pain-related factors rather than one universal cause.
Read a little more: Why does TMD develop?
The OPPERA study followed adults who initially had no painful TMD. Its analysis examined many possible predictors together, including health history, clinical findings, psychological measures and pain sensitivity. The findings support looking beyond a single mechanical explanation.[4]
A risk factor is something associated with the likelihood of a condition; it is not proof of what caused one person’s pain. An observational study cannot show that changing a predictor will necessarily prevent the disorder.[4]
Considering distress and the effect of pain on life does not mean pain is imaginary. The DC/TMD framework assesses physical findings alongside function and psychosocial factors to understand the person’s experience.[3]
An imperfect bite is not a sufficient explanation for TMD. Michelotti and Iodice’s review cautions against treating orthodontic and occlusal factors as a simple causal story.[5]
Why can pain seem to come from somewhere else?
Pain can be felt away from its source. A sore tooth or ear feeling does not, on its own, identify which tissue is responsible.
Read a little more: Why can pain seem to come from somewhere else?
In referred muscle pain, the place where pain is felt differs from its source. Jaw or neck muscles may produce discomfort felt in the face, near an ear or even in a tooth. That possibility does not rule out a genuine dental or ear problem; distinguishing them requires assessment.[2]
What helps make sense of the symptoms?
A history and examination help distinguish possible sources of pain and understand how symptoms affect daily life.
Read a little more: What helps make sense of the symptoms?
It helps to describe when the symptoms started, what provokes them, any locking and how eating or opening is affected. The examination can compare the reported pain with the findings, rather than infer a diagnosis from a scan alone.[1]
DC/TMD includes assessment of pain, jaw function and the impact of symptoms. Screening questions help organise information; they do not replace clinical interpretation.[3]
Sources & limits
Sources checked September 26, 2026. This selected-source guide supports a conversation with a clinician; it does not diagnose an individual. Evidence notes explain scope and uncertainty, rather than formally grade every study. A finding for one age, condition or outcome does not establish every related claim.
- NIDCR: Temporomandibular disorders (TMD)
Public guidance on symptoms, diagnosis and treatment.
Back to text ↑ - American Academy of Orofacial Pain — Muscle pain
Public patient information; explanatory sections on muscle and referred pain reviewed. This guide does not reproduce its treatment list.
Back to text ↑ - Schiffman et al. (2014) — Diagnostic Criteria for TMD (DC/TMD)
Primary abstract checked. A clinical and research diagnostic framework, including physical findings, function and psychosocial assessment; not a self-diagnosis checklist.
Back to text ↑ - Bair et al. (2013) — Risk factors for first-onset TMD: the OPPERA prospective cohort
Primary abstract checked. An observational adult cohort studying predictors of first-onset painful TMD. Prediction and association do not establish one individual cause.
Back to text ↑ - Michelotti & Iodice (2010) — The role of orthodontics in temporomandibular disorders
Review abstract checked. Used for the limits of bite-based causal explanations, not as a review of every subsequent study.
Back to text ↑
A professional reference
TMD and Orthodontics, edited by Sanjivan Kandasamy, Charles Greene, Donald Rinchuse and John Stockstill (2015), includes chapters on classification and etiology, and psychological considerations by Richard Ohrbach and Ambra Michelotti. Publisher information and the contents were checked; the full book was not reviewed for this guide. Access may require a library or purchase.