FND Education Project

REFERENCE · DIAGNOSIS

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.

Quick Reference

Presentation: 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.

More techniques: See the full list below.

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Your mouth may feel pulled to one side, your jaw may sit off-centre, or an eye may keep narrowing or closing. Speaking, keeping your lips together or looking at someone may become difficult. This page concerns those facial movement difficulties; their appearance alone cannot tell you their cause. [1][2][5]

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. [9]

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.

What to bring to the assessment

A few ordinary examples can help: what your face does, how long it lasts, whether it hurts, and what it interrupts. You can describe the help needed for communication, meals, mouth care, reading or going out. You do not have to reproduce a painful episode to explain its impact.

Ask the clinician to explain what supports the diagnosis and what still needs assessment. A short successful movement does not settle whether you can repeat it comfortably all day. If embarrassment, worry or being misunderstood is affecting you, that also deserves attention without being assumed to be the cause.

If you cannot fully close an eye, seek prompt advice about protecting it. This is a different problem from an eye being pulled shut; an individual assessment should guide care. [10]

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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.

Helping with an appointment

With permission, help recall the sequence and timing, bring previous reports and describe practical assistance you provide. Distinguish what you saw from what the person felt. Ask whether they want help taking notes or communicating, and leave time for their own answers. An existing video may help if safely obtained and shared with consent; do not arrange a performance of symptoms for the appointment.

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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.

Motor and vocal tic-like symptoms

Facial tic-like movements need their own assessment. A facial location does not make a tic equivalent to dystonia, weakness or spasm. [8] See the dedicated functional-tics page.

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

The original eight-step outline is preserved in Pattern-Based Facial Examination. The mouth guide and eye/differential guide expand the relevant questions and limits.

The classic-pattern evidence comes from selected specialist cohorts: a 61-person seven-centre retrospective group and a separate 58-person stomatognathic group. Their patterns and referral populations differ. Frequencies within these selected samples are not diagnostic sensitivity or prevalence 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.

Everyday impact and coordinated assessment

Record diagnostic evidence, observed performance and daily disability separately. Ask which tasks matter, how often they are possible, what help is needed and what pain or recovery follows. Include communication, meals, eye comfort, dental access and social participation when relevant; these are questions for the individual, not assumed consequences for everyone.

Neurology/movement-disorders assessment may clarify the pattern; neuro-ophthalmology, speech-language services and oral medicine/dentistry may address different unresolved questions. OT and physiotherapy can contribute task and support assessment within their expertise. Agree who coordinates the plan and when a changed presentation needs review.

The mouth guide’s activity record is an authored discussion aid, not a validated facial disability scale. Support should not depend on demonstrating a positive sign during every appointment.

Media contributor brief

The original brief is preserved in the pattern-based examination guide, with consent, captions and accessibility guidance.

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

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Diagnostic techniques at a glance

The seven-entry inventory preserves every original description and source association. The detailed guides expand their interpretation; patterns and investigations are not interchangeable with validated diagnostic tests.

Lower-lip pulling with jaw deviation

Describe the lower-face pattern in context.

Platysma overactivity

Distinguish neck-muscle overactivity from weakness comparisons.

Task inconsistency and distractibility

Compare comfortable tasks and interpret the differences.

Jaw, tongue and stomatognathic assessment

Assess regional movement and the tasks affected.

Hemifacial-spasm comparison

Compare the whole pattern and consider facial-nerve-related spasm.

Understand the small specialist study and its limits.

Facial strength, reflexes and targeted investigations

Select investigations for the actual clinical question.

Research and Sources

Evidence notes

  • 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]
  • 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]
  • 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]

Citation table

Citation Figure 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. DOI: 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. DOI: 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 October 11, 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.
[8] — Malaty IA, Anderson S, Bennett SM, et al. Diagnosis and management of functional tic-like phenomena. Journal of Clinical Medicine. 2022;11(21):6470. DOI. FND-CIT-0110.
[9] — NHS. Symptoms of a stroke. Reviewed September 12, 2024; accessed October 6, 2026. Source. FND-CIT-0108.
[10] — NHS. Bell’s palsy. Accessed October 6, 2026. Source. FND-CIT-0197.

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