Functional Facial Symptoms — Spasm, Droop and Weakness

Refers to:

• facial pulling, spasm or dystonia and apparent droop caused by overactivity;
• assessed functional facial weakness, eye closure or ptosis; and
• lip, jaw or tongue movement and mouth-seal difficulty when facial motor control is central.

Scope boundary: This category may overlap dystonia, limb weakness, speech or swallowing, but its diagnostic and recovery techniques must follow the actual facial mechanism—overactive pulling, weakness, eye closure, mouth control or another assessed pattern. Limb-only symptoms use the partial-weakness or paralysis page.

Featured technique: Specialist history and examination of facial movement, muscle activation and weakness.
Diagnostic method: Identify a positive functional facial pattern in the wider neurological examination while assessing stroke, facial-nerve disease, hemifacial spasm, non-functional dystonia and other alternatives.
Media needed: A consented, captioned still-image sequence or continuous examination clip showing the observed muscles and change without presenting one facial appearance as diagnostic.

Diagnostic techniques at a glance

Motor and vocal tic-like symptoms

Diagnostic techniques at a glance

These brief entries describe signs, observations, criteria and investigations clinicians may consider. They are not a checklist of tests everyone needs. Evidence and limitations differ for each entry; a positive sign must fit the whole clinical picture, including possible coexisting disease.

The longer explanations already on this page remain below. Individual technique pages will be developed and reviewed separately.

Lower-lip pulling with jaw deviation

The clinician observes sustained unilateral lip pulling, often with jaw movement and neck-muscle activation. A multicentre series describes this functional phenotype, but a characteristic appearance is not a standalone validated test. Facial weakness and other dystonias require assessment. [1]

Platysma overactivity

Visible activation of the superficial neck muscle can accompany functional facial pulling. This is a descriptive pattern distinct from reduced platysma activation in weakness testing. Neither finding should be interpreted without the corresponding facial and limb examination. [1][6]

Task inconsistency and distractibility

Facial movement is compared during conversation, expression and other comfortable tasks. A clear inconsistency can support the diagnosis; fluctuation alone cannot. The published evidence is mainly observational rather than a validated universal facial test battery. [1][2]

Jaw, tongue and stomatognathic assessment

Specialist examination characterizes mouth, jaw and tongue movements and their task dependence. A clinical cohort proposed a structured approach, but its selected sample limits generalisation. Dental, medication-related and neurological causes remain relevant. [2]

Hemifacial-spasm comparison

The clinician compares the distribution and timing of eyelid and lower-face movements, including eyebrow behaviour where useful. Functional mimics are described, but unusual facial movement alone is insufficient; neurological assessment and selected testing address genuine hemifacial spasm. [1]

Blink-reflex recovery cycle

A small comparative study examined an electrophysiological difference between essential and presumed functional blepharospasm. It is a specialist adjunct with limited validation, not a routine diagnostic test for all facial FND. [7]

Facial strength, reflexes and targeted investigations

Testing facial power and associated neurological findings helps distinguish weakness from overactivity and identify other causes. Imaging or neurophysiology may be appropriate. Normal tests alone do not establish functional facial symptoms. [1][6]

---

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

For the Person With FND

Facial droop is a description, not a diagnosis. One person may have weakness of facial muscles. Another may have muscle overactivity pulling the corner of the mouth down and the jaw to one side, creating an appearance that resembles weakness. Functional facial symptoms can also involve narrowing or closure around an eye, lip or jaw spasm, facial pulling, tongue movement, difficulty holding the lips together, or, less commonly, functional facial weakness or a droopy eyelid. A photograph or online description cannot safely tell these mechanisms apart. [1][3][5]

The best-described functional facial movement pattern is sustained downward or sideways pulling of one side of the lower lip, often with the jaw pulled toward the same side and visible tightening of the thin platysma muscle across the front of the neck. This is muscle overactivity, not proof that the lower half of the face is weak. The pattern is useful evidence only when a clinician recognizes it in the full history and examination. [1][2][3]

Facial symptoms can be episodic or long-lasting

Functional facial spasm or pulling may occur in episodes, fluctuate through the day, last minutes or hours, or sometimes become persistent. In published clinical groups, paroxysmal symptoms, inconsistency over time and spontaneous exacerbations or remissions were common, but no one time pattern proves that a facial symptom is functional. [1][2][5]

During a familiar, medically assessed episode, stop driving, eating or another activity made unsafe by impaired vision, mouth control or awareness. Use only the positioning or onset strategy already agreed with the treating team. Do not repeatedly force the mouth straight, stretch the jaw, pry open an eyelid or test the face until it is painful.

[!CAUTION] New, sudden or distinctly changed facial droop needs urgent medical assessment. Stroke, transient ischemic attack and other neurological conditions must not be dismissed because the person has FND or has experienced facial symptoms before. Call emergency services when facial droop begins suddenly or occurs with new arm or leg weakness, speech or understanding difficulty, severe headache, loss of balance, double vision, confusion or reduced consciousness.

Drooling may occur when lip or mouth control is reduced, but it can also accompany swallowing, dental, medication, facial-nerve or other medical problems. New drooling, coughing or choking with food or drink, a wet or gurgly voice, food remaining in the mouth, recurrent chest infection, dehydration or weight loss deserves swallowing and medical assessment. See Functional Swallowing Symptoms and Globus.

---

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

For Family, Friends, and Other Supporters

Treat a new facial droop as new medical information. Note when the change began and whether there is new weakness, speech trouble, confusion, severe headache, altered awareness, breathing or swallowing difficulty. Do not delay emergency assessment while trying to decide whether the face looks “functional.”

During an established facial episode

If the person has already had the facial symptom assessed and it matches their established pattern:

1. Stop any unsafe activity and help protect the person’s vision, airway and balance.
2. Ask before touching the face, mouth, jaw or neck.
3. Offer the one agreed cue, position or communication aid; do not give a stream of instructions.
4. Do not pull the mouth corner, force the jaw straight, hold an eyelid open or repeatedly ask for a smile.
5. Help with tissues, skin care, communication or privacy if drooling or facial pulling is embarrassing.
6. Record duration, visible muscle pulling, speech or swallowing change, associated symptoms and recovery when that information will help the care team.

A familiar episode may be brief or may last much longer. Support safety and dignity rather than expecting the person to stop it on command. An inability to change the symptom says nothing about effort.

---

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

For Clinicians and the Care Team

Start by deciding what the word droop describes: reduced facial activation, sustained downward lip pulling, jaw deviation, platysma or orbicularis oculi overactivity, ptosis, impaired mouth closure, or a mixed presentation. Functional facial dystonia and genuine functional facial weakness are not interchangeable labels. Explain the observed mechanism to the patient and show the positive evidence when it is safe and clear.

Episodic and persistent presentations

Document onset, duration, frequency, side, stereotypy, warning symptoms, pain, sensory symptoms, triggers, task or environment, other FND symptoms and recovery. When the sign is absent in clinic, safely obtained home video may help characterize the movement, but it cannot replace examination and differential diagnosis. A recurrent functional pattern and a new vascular, facial-nerve, neuromuscular or movement disorder can coexist.

Technique outline: pattern-based facial examination

1. Clarify the phenotype. Observe the face at rest, during spontaneous speech and expression, and during selected facial movements. Record actual movement and muscle activation rather than beginning with the label “weakness.”
2. Look for the recognized lower-face pattern. Sustained unilateral downward or lateral lower-lip pulling, ipsilateral jaw deviation and platysma contraction support functional facial dystonia in the appropriate setting.
3. Assess the eye carefully. Distinguish orbicularis oculi overactivity and active eye closure from ptosis or impaired eye closure. Functional ptosis and functional eye closure are uncommon and require appropriate neuro-ophthalmic or movement-disorder expertise.
4. Test for positive functional features without provocation. Look for reproducible internal inconsistency, variability across tasks, distractibility or a change with automatic expression. Do not diagnose from abrupt onset, psychiatric history, normal imaging, pain or one unusual movement alone.
5. Examine connected functions. Assess speech, tongue and jaw movement, lip seal, swallowing safety, limb findings, gait and awareness when the history indicates. Facial spasm may coexist with other functional symptoms, including ipsilateral functional limb weakness.
6. Assess alternatives and coexistence. Consider acute stroke or TIA, Bell palsy and other facial neuropathies, post-palsy synkinesis, hemifacial spasm, blepharospasm, non-functional cranial or oromandibular dystonia, myasthenia gravis and other causes of ptosis, medication-induced movement disorders, structural lesions, dental or temporomandibular disease, migraine and seizure-related phenomena.
7. Use tests to answer a clinical question. Imaging, vascular assessment, electrodiagnostic testing, laboratory work, swallow assessment or specialist review may be needed according to onset and phenotype. Normal tests do not create a positive FND diagnosis.
8. Explain limits and safety. State which positive features support the diagnosis, which alternatives were assessed, whether more than one condition may be present, and what new pattern should trigger reassessment.

The classic-pattern evidence comes from selected specialist cohorts, not a validated stand-alone bedside test. In a 61-person, seven-centre retrospective group, 84.3% had sustained lateral or downward lower-lip movement with jaw deviation; in a separate selected 58-person stomatognathic cohort, the classic pattern appeared in 44.8%. The different estimates reflect different referral groups and methods and should not be presented as the prevalence of this pattern in all people with FND. [1][2]

When improvement is limited, continuing care may still address drooling and skin care, communication access, eating and swallowing safety, eye comfort and vision access, pain, dental or jaw complications, social embarrassment, work or school adaptations and an agreed reassessment plan.

Media contributor brief

Use one continuous, consented clip or a short still-image sequence showing:

1. a neutral view at comfortable rest;
2. the exact lower-lip, jaw, eyelid or neck-muscle change;
3. one safe comparison during spontaneous expression or another clinically appropriate task; and
4. an anatomical overlay naming the active muscle when this is known.

The caption must say that one image cannot distinguish stroke, facial-nerve weakness, hemifacial spasm, dystonia and functional facial symptoms. Do not ask a person to repeat a painful spasm, remove ordinary supports, eat or drink for a demonstration, or delay acute medical assessment to obtain media.

---

Recovery reading: Ten detailed facial recovery and care pages, selected according to the assessed movement, oral function and eye-safety needs.

---

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —

Research and Sources

Source for this boundary: Malaty IA, Anderson S, Bennett SM, et al. Diagnosis and management of functional tic-like phenomena. Journal of Clinical Medicine. 2022;11(21):6470. FND-CIT-0110; source.

Evidence notes

• Fasano and colleagues retrospectively described 61 people seen across seven tertiary movement-disorder centres. The study supports a recognizable functional facial-movement phenotype and a fluctuating course, but selection, retrospective assessment and exclusion of known non-functional facial disorders limit generalization. [1]
• Yoshida reported a separate, single-centre group selected with a study-specific 10-feature scale. It supports jaw deviation, lip pulling, tongue movement, paroxysmal symptoms, inconsistency and incongruity as useful pattern information; it did not validate a diagnostic score for independent clinical use. [2]
• Popkirov, Stone and Buchan describe unilateral lip pulling as a functional dystonic stroke mimic caused by muscle overactivity. Their article is a clinical review, not a diagnostic-accuracy study, and acute stroke pathways remain necessary when onset is new. [3]
• The functional-dystonia review emphasizes positive pattern recognition, coexistence with non-functional disorders and individualized multidisciplinary care. [4]
• The specialist Neurosymptoms page distinguishes functional facial spasm, rarer functional facial weakness and functional ptosis, while stressing the differential diagnosis. It is an expert educational source rather than a controlled study. [5]

Citation table

Citation	Full citation
[1]	Fasano A, Valadas A, Bhatia KP, et al. Psychogenic facial movement disorders: clinical features and associated conditions. Movement Disorders. 2012;27(12):1544–1551. FND-CIT-0052. https://doi.org/10.1002/mds.25190
[2]	Yoshida K. Clinical characteristics of functional movement disorders in the stomatognathic system. Frontiers in Neurology. 2020;11:123. FND-CIT-0053. https://doi.org/10.3389/fneur.2020.00123
[3]	Popkirov S, Stone J, Buchan AM. Functional neurological disorder: a common and treatable stroke mimic. Stroke. 2020;51(5):1629–1635. FND-CIT-0054. https://doi.org/10.1161/STROKEAHA.120.029076
[4]	Frucht L, Perez DL, Callahan J, et al. Functional dystonia: differentiation from primary dystonia and multidisciplinary treatments. Frontiers in Neurology. 2021;11:605262. FND-CIT-0021. https://doi.org/10.3389/fneur.2020.605262
[5]	Stone J. Functional facial symptoms. Neurosymptoms.org. Accessed September 1, 2026. FND-CIT-0056. https://neurosymptoms.org/en/symptoms/fnd-symptoms/functional-facial-symptoms/

[6]	Horn D, Galli S, Berney A, et al. Testing Head Rotation and Flexion Is Useful in Functional Limb Weakness. Movement disorders clinical practice. 2017;4(4):597-602. DOI. PMID: 30363481. FND-CIT-0155.
[7]	Schwingenschuh P, Katschnig P, Edwards MJ, et al. The blink reflex recovery cycle differs between essential and presumed psychogenic blepharospasm. Neurology. 2011;76(7):610-614. DOI. PMID: 21321334. FND-CIT-0124.

Evidence search current to September 1, 2026 · Movement-disorders, stroke, speech-language and lived-experience review pending

---

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources —