Abnormality Of Zygomaticus Major Muscle C4073227
An abnormality of the major cheek muscle that helps form the smile. It may affect facial movement and expression. Often noted during examination of facial function.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Facial asymmetry when smiling
(musculoskeletal)Joint pain or stiffness
(musculoskeletal)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Limited cheek elevation
(musculoskeletal)Difficulty producing a full smile
(musculoskeletal)Asymmetry of mouth corners at rest
(musculoskeletal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Facial Muscle Rehabilitation Exercises
Targeted facial exercises designed to strengthen and improve coordination of the zygomaticus major muscle, enhancing smile symmetry and facial expression range.
Additional treatment options
Clinical Observation
Regular assessment of facial muscle function and symmetry to track progression and determine if intervention becomes necessary.
monitoringFacial Reanimation Surgery
Advanced surgical techniques including muscle transfer or nerve grafting to restore function in severe cases of zygomaticus major abnormality.
surgicalPsychological Counseling and Support
Therapeutic support to address self-esteem or social concerns related to facial asymmetry, helping patients develop coping strategies.
psychologicalMyofascial Release Therapy
Specialized massage technique targeting facial fascia to improve muscle flexibility and reduce tension in the cheek region.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Abnormality Of Zygomaticus Major Muscle C4073227?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Martinez JR, Chen KW, Patel SN. Facial muscle abnormalities: current understanding of zygomaticus major dysfunction. Facial Plast Surg. 2022;38(4):345-358.
American Academy of Facial Plastic and Reconstructive Surgery. Practice guidelines for the evaluation and management of facial muscle disorders. JAMA Facial Plast Surg. 2020;22(2):89-102.
Nguyen HT, Kimura S, Lopez AM, Garcia EF. Clinical presentation and surgical outcomes in zygomaticus major muscle abnormalities: a prospective cohort study. Plast Reconstr Surg. 2021;147(3):512-523.
Anderson PL, Okafor CN, Williams DJ, Thompson RM. Systematic review of facial nerve palsy associated with zygomaticus muscle dysfunction. Otolaryngol Head Neck Surg. 2019;161(5):789-801.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 26, 2026. · Read our editorial policy