Masseter Muscle Sprain

Patient Tools

Read, save, and share this guide

Use these quick tools to make this medical article easier to read, print, save, or share with a family member.

On this page11 sections

Article Summary

A masseter muscle sprain, more accurately termed a masseter muscle strain, is an injury where the powerful chewing muscle at the side of your jaw becomes overstretched or torn. This injury commonly results from excessive mechanical stress—such as forceful contraction or overextension—leading to microscopic tears in the muscle fibers. Although true “sprains” involve ligaments, in lay terms it’s not unusual for people to refer to...

Key Takeaways

  • This article explains Anatomy of the Masseter Muscle in simple medical language.
  • This article explains Types of Masseter Muscle Sprain in simple medical language.
  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
Before reading

RX Patient Tools

Use these quick guides before reading the article, or return to them when you need help preparing questions for a doctor.

Start here Choose the right pathway for symptoms, reports, medicines, or urgent warning signs. Disease article roadmap Read this topic step by step: meaning, symptoms, warning signs, diagnosis, treatment, prevention, and follow-up. Treatment planner Prepare questions about treatment choices, benefits, risks, side effects, and follow-up. Family & caregiver guide Organize symptoms, reports, medicines, questions, and follow-up safely. Nutrition & diet guide Prepare food, hydration, supplement, and medicine-timing questions safely. Prevention guide Organize risk factors, protective habits, screening, and warning signs. Recovery guide Prepare a safe plan for activity, rehabilitation, warning signs, and follow-up.
Educational health guideWritten for patient understanding and clinical awareness.
Reviewed content workflowUse writer and reviewer profiles for stronger trust.
Emergency safety firstUrgent warning signs are highlighted below.
Definition

A masseter muscle , more accurately termed a masseter , is an injury where the powerful chewing muscle at the side of your jaw becomes overstretched or torn. This injury commonly results from excessive mechanical stress—such as forceful contraction or overextension—leading to microscopic tears in the muscle fibers. Although true “sprains” involve , in lay terms it’s not unusual for people to refer to a masseter as a sprain. Proper understanding and management are essential to relieve , restore function, and prevent . Physio-pediaBetter Health Channel


of the Masseter Muscle

The masseter is one of four muscles of mastication—the primary group responsible for chewing. It is the most superficial and among the strongest of these muscles. WikipediaWikipedia

  • Structure & Location: A thick, rectangular muscle on the side of the face, extending from the cheekbone (zygomatic arch) down to the (mandibular ramus). Kenhub

  • Origin:

  • Insertion: Lateral surface of the mandibular ramus and angle of the Kenhub

  • Blood Supply: Masseteric (branch of the maxillary artery), with anastomoses to the transverse facial artery Wikipedia

  • Nerve Supply: Masseteric nerve, a branch of the mandibular division (V₃) of the trigeminal nerve (cranial nerve V) Wikipedia

  • Primary Functions (six key actions):

    1. Elevation of the mandible (closing the jaw)

    2. Protrusion of the mandible (bringing the jaw forward)

    3. Retraction of the mandible (pulling the jaw backward)

    4. Ipsilateral excursion (lateral movement to the same side)

    5. Contralateral excursion (lateral movement to the opposite side via coordinated action)

    6. Stabilization of the temporomandibular joint during clenching Verywell Health


Types of Masseter Muscle Sprain

Muscle strains are classified by severity into three grades:

  1. Grade I (): Overstretching or microscopic tears without significant loss of function; minimal and Physio-pedia

  2. Grade II (): Partial tear of muscle fibers; moderate pain, swelling, and some loss of strength and range of motion Physio-pedia

  3. Grade III (): Complete rupture of muscle fibers or musculotendinous junction; severe pain, swelling, and total loss of function; often requires surgical repair Physio-pedia


Causes

  1. Bruxism (teeth grinding/clenching) Morningside Acupuncture NYC

  2. (direct blow to the jaw)

  3. Sudden forceful bite (e.g., biting hard object)

  4. Sports injuries (contact sports without mouthguard)

  5. Dental procedures (prolonged mouth opening)

  6. Intubation (stretch during anesthesia)

  7. Whiplash (neck injury with jaw involvement)

  8. Poor posture (forward head posture increasing muscle load)

  9. Emotional stress (unconscious clenching)

  10. Repetitive chewing (gum chewing, tough foods)

  11. Eccentric overload (forceful jaw movements)

  12. Hyperextension (over-opening during yawning)

  13. Connective tissue disorders (e.g., Ehlers–Danlos )

  14. Inadequate warm-up (sudden jaw use without preparation)

  15. Muscle (prolonged use without rest)

  16. Neuromuscular imbalance (asymmetry in chewing muscles)

  17. Post-surgical strain (after TMJ surgery)

  18. ( and decreased elasticity)

  19. (rarely can weaken muscle tissue)

  20. Age-related degeneration (loss of muscle elasticity)


Symptoms

  1. jaw pain, especially when chewing Verywell Health

  2. Tenderness on palpation of the masseter

  3. Swelling over the jaw angle

  4. Muscle or tightness

  5. Limited mouth opening (trismus)

  6. Jaw deviation toward the injured side

  7. Clicking or popping sounds in the TMJ

  8. Difficulty chewing hard foods

  9. Referred ear pain (otalgia)

  10. (tension-type)

  11. Facial asymmetry when clenching

  12. (in severe tears)

  13. on the affected side

  14. Jaw fatigue after brief activity

  15. Grinding noises felt under fingers

  16. Tender (if inflammatory)

  17. Crepitus (grating sensation)

  18. Increased pain with cold weather

  19. Pain at rest in moderate/severe cases

  20. Locking of the jaw in severe Grade III


Diagnostic Tests

  1. & physical exam (palpation; range of motion) Wikipedia

  2. Maximum mouth opening measurement

  3. Bite force assessment

  4. Ultrasonography (to visualize tears)

  5. Magnetic Resonance Imaging (MRI) (muscle edema/tear)

  6. Computed Tomography (CT) (bony involvement)

  7. X-ray (rule out fracture)

  8. Electromyography (EMG) (assess muscle activity)

  9. Surface electromyography (sEMG)

  10. Nerve conduction studies (to exclude neuropathy)

  11. Tenderness mapping (marking trigger points)

  12. Pain scales (Visual Analog Scale, VAS)

  13. Jaw tracking analysis (motion studies)

  14. Ultrasound elastography (muscle stiffness)

  15. Thermography (inflammation mapping)

  16. TMJ arthroscopy (direct visualization)

  17. Diagnostic nerve block (local anesthetic to confirm source)

  18. Laboratory tests (CBC, inflammatory markers if infection suspected)

  19. Jaw function questionnaires (e.g., Jaw Functional Limitation Scale)

  20. Dental occlusion assessment (bite analysis)


Non-Pharmacological Treatments

  1. Rest (avoid chewing hard foods) Better Health Channel

  2. Ice packs (first 48–72 hours; 20 min on/off)

  3. Heat therapy (after acute phase)

  4. Compression bandage (support muscle)

  5. Elevation of head (during rest to reduce swelling)

  6. Gentle massage (small circular motions)

  7. Trigger point release (knuckle pressure) Peak Physio

  8. Stretching exercises (jaw opening stretches) Armor Physical Therapy

  9. Goldfish exercises (partial opening/closing) sarh

  10. Tongue-up opening (tongue on palate)

  11. Jaw stabilization exercises (isometric)

  12. Transcutaneous Electrical Nerve Stimulation (TENS)

  13. Ultrasound therapy

  14. Soft diet (avoid tough, chewy foods)

  15. Jaw rest position (lips together, teeth apart) Results Physiotherapy

  16. Postural correction (ergonomic adjustments)

  17. Biofeedback (muscle relaxation training)

  18. Relaxation techniques (deep breathing)

  19. Acupuncture/dry needling Morningside Acupuncture NYC

  20. Kinesio taping (facilitates muscle support)

  21. Night guard/splint therapy (for bruxism)

  22. Low-level laser therapy

  23. Shockwave therapy

  24. Myofascial release

  25. Craniosacral therapy

  26. Hydrotherapy (warm water exercises)

  27. Cold laser (photobiomodulation)

  28. Ergonomic counselling (habits & posture)

  29. Nutritional support (anti-inflammatory diet)

  30. Education & self-care training


Drugs

  1. Ibuprofen (NSAID) Verywell Health

  2. Naproxen (NSAID)

  3. Diclofenac (NSAID)

  4. Acetaminophen (Paracetamol)

  5. Aspirin

  6. Celecoxib (COX-2 inhibitor)

  7. Ketorolac

  8. Cyclobenzaprine (muscle relaxant)

  9. Tizanidine (muscle relaxant)

  10. Methocarbamol (muscle relaxant)

  11. Diazepam (benzodiazepine muscle relaxant)

  12. Baclofen

  13. Tramadol (opioid for severe pain)

  14. Prednisone (short-term corticosteroid)

  15. Corticosteroid injection (local)

  16. Botulinum toxin (to reduce muscle hyperactivity)

  17. Topical NSAIDs (diclofenac gel)

  18. Lidocaine patch (topical analgesic)

  19. Gabapentin (for neuropathic pain component)

  20. Amitriptyline (low dose, for pain modulation)


Surgeries

Note: Surgical intervention is rare and reserved for persistent, severe cases unresponsive to conservative management. Verywell Health

  1. TMJ arthrocentesis (joint lavage)

  2. Arthroscopy (minimally invasive joint surgery)

  3. Open joint arthrotomy (for severe internal derangement)

  4. Coronoidectomy (release of coronoid process for mouth opening)

  5. Muscle release myotomy (partial release of masseter fibers)

  6. TMJ disc repositioning

  7. Joint reconstruction (using grafts)

  8. Condylar shave (bone contouring)

  9. Total joint replacement (arthroplasty)

  10. Botulinum toxin injection under surgical guidance


Prevention Strategies

  1. Warm-up exercises before prolonged chewing or dental procedures Verywell Health

  2. Stress management (relaxation, counselling)

  3. Proper posture (ergonomic workstation setup)

  4. Use of bite guard (for bruxism)

  5. Regular breaks when chewing tough foods

  6. Soft diet during high-risk activities

  7. Nighttime muscle relaxation techniques

  8. Adequate hydration (muscle elasticity)

  9. Balanced diet (rich in anti-inflammatory nutrients)

  10. Routine dental check-ups (to identify malocclusion)


When to See a Doctor

Seek professional evaluation if you experience:

  • Severe or worsening pain lasting more than 7 days

  • Inability to open or close your mouth

  • Signs of infection (fever, redness, warmth)

  • Numbness or weakness in the facial area

  • Persistent swelling despite home care

  • Locking of the jaw (inability to move it)

  • Suspected fracture after trauma

  • Uncontrolled bruxism affecting daily life

  • Neuropathic symptoms (tingling, shooting pain)

  • No improvement after 2 weeks of conservative treatment Verywell Health


Frequently Asked Questions

  1. What is the difference between a sprain and a strain?
    A sprain injures ligaments; a strain injures muscles or tendons Better Health Channel.

  2. How long does a masseter strain take to heal?
    Mild strains may heal in 1–2 weeks; moderate to severe tears can take 4–8 weeks or more with rehab.

  3. Can I still eat normally?
    During acute injury, stick to soft or liquid diet to reduce stress on the muscle.

  4. Are jaw exercises safe?
    Yes, gentle stretching and strengthening under guidance help recovery and prevent stiffness.

  5. Will massage make it worse?
    Gentle massage can relieve tension, but avoid deep pressure in the acute phase to prevent further damage.

  6. Can stress cause masseter strain?
    Yes—emotional stress often leads to clenching, a common cause of muscle strain Morningside Acupuncture NYC.

  7. Is imaging always needed?
    Not for mild cases; reserved for suspected severe tears, complications, or if symptoms persist.

  8. Do I need surgery for a masseter strain?
    Rarely; only for Grade III tears with complete rupture and failed conservative management.

  9. Can I prevent it from recurring?
    Yes—through stress management, proper ergonomics, and use of mouthguards at night.

  10. Will NSAIDs alone fix it?
    NSAIDs help control pain and inflammation but should be combined with rest and exercises for best results.

  11. Is heat or cold better?
    Use cold in the first 48–72 hours to control swelling, then switch to heat to relax muscles.

  12. Can acupuncture help?
    Yes—acupuncture and dry needling can relieve trigger points and muscle tension Morningside Acupuncture NYC.

  13. What if I wake with jaw pain?
    Consider night guards for bruxism and practice relaxation exercises before bed.

  14. Are over-the-counter guards effective?
    They can reduce clenching but custom-fitted guards from a dentist provide better protection.

  15. When should I see a specialist?
    If pain persists beyond 2 weeks, or you have locking, severe swelling, or signs of infection.

Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical  history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.

The article is written by Team Rxharun and reviewed by the Rx Editorial Board Members

Last Updated: April 24, 2025.

  1. https://pubmed.ncbi.nlm.nih.gov/27887750/
  2. https://www.ncbi.nlm.nih.gov/books/NBK537139/
  3. https://www.ncbi.nlm.nih.gov/books/NBK537236/
  4. https://www.ncbi.nlm.nih.gov/books/NBK537140/
  5. https://pubmed.ncbi.nlm.nih.gov/30335291/
  6. https://pubmed.ncbi.nlm.nih.gov/30725921/
  7. https://pubmed.ncbi.nlm.nih.gov/30725824/
  8. https://www.ncbi.nlm.nih.gov/books/NBK559006/
  9. https://pubmed.ncbi.nlm.nih.gov/30725825/
  10. https://en.wikipedia.org/wiki/Muscle
  11. https://en.wikipedia.org/wiki/List_of_skeletal_muscles_of_the_human_body
  12. https://medlineplus.gov/ency/imagepages/19841.htm
  13. https://www.britannica.com/science/human-muscle-system
  14. https://training.seer.cancer.gov/anatomy/muscular/types.html
  15. https://www.britannica.com/science/human-muscle-system
  16. https://www.sciencedirect.com/topics/medicine-and-dentistry/skeletal-muscle
  17. https://academic.oup.com/nar/article/32/5/1792/2380623
  18. https://onlinelibrary.wiley.com/journal/10974598
  19. https://medlineplus.gov/skinconditions.html
  20. https://en.wikipedia.org/wiki/Category:Kidney_diseases
  21. https://kidney.org.au/your-kidneys/what-is-kidney-disease/types-of-kidney-disease
  22. https://www.niddk.nih.gov/health-information/kidney-disease
  23. https://www.kidney.org/kidney-topics/chronic-kidney-disease-ckd
  24. https://www.kidneyfund.org/all-about-kidneys/types-kidney-diseases
  25. https://www.aad.org/about/burden-of-skin-disease
  26. https://www.usa.gov/federal-agencies/national-institute-of-arthritis-musculoskeletal-and-skin-diseases
  27. https://www.cdc.gov/niosh/topics/skin/default.html
  28. https://www.mayoclinic.org/diseases-conditions/brain-tumor/symptoms-causes/syc-20350084
  29. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep
  30. https://www.cdc.gov/traumaticbraininjury/index.html
  31. https://www.skincancer.org/
  32. https://illnesshacker.com/
  33. https://endinglines.com/
  34. https://www.jaad.org/
  35. https://www.psoriasis.org/about-psoriasis/
  36. https://books.google.com/books?
  37. https://www.niams.nih.gov/health-topics/skin-diseases
  38. https://cms.centerwatch.com/directories/1067-fda-approved-drugs/topic/292-skin-infections-disorders
  39. https://www.fda.gov/files/drugs/published/Acute-Bacterial-Skin-and-Skin-Structure-Infections—Developing-Drugs-for-Treatment.pdf
  40. https://dermnetnz.org/topics
  41. https://www.aaaai.org/conditions-treatments/allergies/skin-allergy
  42. https://www.sciencedirect.com/topics/medicine-and-dentistry/occupational-skin-disease
  43. https://aafa.org/allergies/allergy-symptoms/skin-allergies/
  44. https://www.nibib.nih.gov/
  45. https://www.nei.nih.gov/
  46. https://en.wikipedia.org/wiki/List_of_skin_conditions
  47. https://en.wikipedia.org/?title=List_of_skin_diseases&redirect=no
  48. https://en.wikipedia.org/wiki/Skin_condition
  49. https://oxfordtreatment.com/
  50. https://www.nidcd.nih.gov/health/
  51. https://consumer.ftc.gov/articles/w
  52. https://www.nccih.nih.gov/health
  53. https://catalog.ninds.nih.gov/
  54. https://www.aarda.org/diseaselist/
  55. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets
  56. https://www.nibib.nih.gov/
  57. https://www.nia.nih.gov/health/topics
  58. https://www.nichd.nih.gov/
  59. https://www.nimh.nih.gov/health/topics
  60. https://www.nichd.nih.gov/
  61. https://www.niehs.nih.gov
  62. https://www.nimhd.nih.gov/
  63. https://www.nhlbi.nih.gov/health-topics
  64. https://obssr.od.nih.gov/
  65. https://www.nichd.nih.gov/health/topics
  66. https://rarediseases.info.nih.gov/diseases
  67. https://beta.rarediseases.info.nih.gov/diseases
  68. https://orwh.od.nih.gov/

Doctor visit helper

Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Medicine doctor / pediatrician for children / qualified clinician
Tests to discuss with doctor
  • Temperature chart and hydration assessment
  • CBC with platelet count if fever persists or dengue/other infection is possible
  • Urine test, malaria/dengue tests, chest evaluation, or blood culture only when clinically indicated
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Do I need antibiotics, or is this more likely viral?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Masseter Muscle Sprain

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.