FND Education Project

REFERENCE · RECOVERY TECHNIQUE

Pain and Muscle-Overactivity Management for Functional Jerks

Most likely fit: Pain, cramp, protective bracing or a repeatable area of excess muscle activity occurs before or between jerks and interferes with posture, sleep or functional practice. [Clinical consensus; treatment must follow the identified condition]

Not the same as: Assuming pain causes every jerk, treating all tightness as functional, or prescribing a drug for “functional myoclonus” without establishing what is being treated. Pain, medication effects and nonfunctional movement disorders require their own assessment.

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What this technique does

This technique identifies and treats problems around the jerks that may be making safe movement harder. If your neck and shoulders remain braced between arm jerks, supported positioning and gentle release may make the next task easier. If back or hip pain consistently comes before trunk jerks, a musculoskeletal and pain assessment may identify a separate condition or a safer way to move. The aim is not to “rub out” an involuntary jerk.

Pain is real whether it is caused by tissue injury, migraine, nerve irritation, persistent pain-system change, muscle overload, another neurological condition or a mixture. FND does not protect someone from other illness, and pain should not be dismissed.

Anatomy in everyday language

Muscle tone is the background resistance felt when a relaxed body part is moved. Overactivity means a muscle is recruited more or for longer than the task requires. Co-contraction means muscles on opposite sides of a joint are active together. These are observations; they do not by themselves identify the cause.

Common areas to assess include:

  • the upper trapezius and levator scapulae (muscles that lift and position the shoulder blade) with shoulder or arm jerks;
  • forearm flexors and extensors (muscles that close, bend or lift the hand and wrist) when gripping persists;
  • rectus abdominis and obliques (front and side abdominal muscles), paraspinals (muscles beside the spine) and hip flexors with trunk jerks; and
  • quadriceps, hamstrings, calf muscles and tibialis anterior (front-shin muscle) when leg jerks affect standing.

The muscle that hurts most may be reacting to repeated movement rather than initiating it. Anatomy guides care but does not prove a single “jerk muscle.”

A safer approach

  1. Describe where pain or bracing occurs, whether it precedes or follows a jerk, and what function it changes.
  2. Use supportive positioning agreed with a clinician—for example, forearm support that reduces sustained shoulder elevation.
  3. Practise a gentle contract–release or breathing-linked release only if it has been demonstrated and does not provoke jerks, dizziness or pain.
  4. Use warmth, cold, massage, stretching, braces or electrical devices only when appropriate for the assessed pain or musculoskeletal problem. Protect skin and sensation.
  5. Adjust task height, reach, load, pace or rest rather than repeatedly forcing through bracing.
  6. Review the response later as well as immediately. Short-term looseness followed by a large flare may mean the dose or technique needs changing.

Do not forcefully stretch a limb during a sudden jerk or pin it down. Do not abruptly stop prescribed medicines. A prescriber should review new jerks after a medication or substance change and decide whether a drug is contributing or treating a separate condition.

When reassessment matters

Seek assessment for new severe pain, injury, swelling, fever, progressive weakness, loss of bladder/bowel control, severe headache, altered awareness, a new neurological pattern, or jerks beginning after a medication/substance change. Sudden chest pain or breathing difficulty needs urgent evaluation.

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Help with the agreed positioning, work-surface change or equipment set-up. Ask before touching. Do not hold a jerking limb down, force it through range, or massage a painful area during an active jerk without a specific safe plan.

Support a medication review when jerks begin or change after a prescription, over-the-counter drug or substance change. Do not recommend someone start, stop or share medication. Notice function—sleep, walking, dressing, meal preparation—not only whether the muscles look relaxed.

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Assessment and formulation

Clarify temporal order: premonitory pain or tension, concurrent recruitment, post-jerk soreness, or independent persistent pain. Examine tissue injury, joint range, instability, focal weakness, sensory change, radicular features, dystonia, spasticity, rigidity, peripheral nerve or root disorder and other musculoskeletal/neurological differentials as indicated. Review medication, stimulant, substance and sleep context.

Map joint position and recruitment. In axial flexion, consider rectus abdominis, external/internal obliques, iliopsoas and rectus femoris; in extension, thoracic/lumbar erector spinae and multifidus with gluteal contribution. For shoulder elevation, differentiate scapulothoracic control from glenohumeral motion. Translate findings without causal overreach: “These muscles remain switched on between movements and are becoming painful; we can reduce that extra work while we retrain the task.”

Explicit treatment sequence

  1. Define whether the immediate target is pain, tissue protection, unnecessary inter-jerk recruitment, sleep, range or participation.
  2. Establish baseline pain quality/intensity, active and passive range, task tolerance, sleep interference and delayed response.
  3. Optimize support and task mechanics. Adjust surface height, lever arm, load, grip and seating before adding an exercise.
  4. Teach one low-force release strategy with consent: supported breathing, brief submaximal contract–release, gentle active range or another condition-specific intervention.
  5. Pair reduced overactivity with a meaningful movement so relaxation does not become prolonged internal monitoring.
  6. Treat identified coexisting pain or musculoskeletal conditions according to their evidence and precautions; coordinate with the relevant clinician.
  7. Review prescribed and nonprescribed agents when temporally relevant. Medication used for organic myoclonus, pain, sleep or psychiatric comorbidity must not be presented as a proven functional-jerk-specific treatment.
  8. Reassess immediate and later effects; reduce dose or change strategy if guarding, pain, fatigue or jerk clusters escalate.

Safety, progression and evidence boundary

Avoid high-force stretching, ballistic loading, cervical manipulation during jerks, painful end range and unmonitored electrical stimulation. Protect joints, skin and sensory-impaired areas. Progress by reducing support or integrating easier recruitment into the task, not by pursuing maximal range or complete stillness.

Measures may include pain interference, active range, excess recruitment, effort, sleep, task completion, injury and delayed worsening. Functional-motor and occupational-therapy consensuses support identifying pain, fatigue, posture and comorbidity within individualized rehabilitation. The physiology-based myoclonus review emphasizes that treatment depends on correct classification and that functional and organic disorders may coexist. These sources do not establish one pain or muscle-release protocol for functional jerks. [1][2][3]

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Research and Sources

Citation Full citation
[1] Nielsen G, Stone J, Matthews A, et al. Physiotherapy for functional motor disorders: a consensus recommendation. Journal of Neurology, Neurosurgery & Psychiatry. 2015;86(10):1113–1119. FND-CIT-0028. https://doi.org/10.1136/jnnp-2014-309255
[2] Nicholson C, Edwards MJ, Carson AJ, et al. Occupational therapy consensus recommendations for functional neurological disorder. Journal of Neurology, Neurosurgery & Psychiatry. 2020;91(10):1037–1045. FND-CIT-0011. https://doi.org/10.1136/jnnp-2019-322281
[3] Peña AB, Caviness JN. Physiology-based treatment of myoclonus. Neurotherapeutics. 2020;17(4):1665–1680. FND-CIT-0092. https://doi.org/10.1007/s13311-020-00922-6

Detailed technique page created: September 11, 2026 · Clinical and accessibility review pending

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