Splenius capitis dystonia is a form of cervical (neck) dystonia in which the involuntary muscle spasms are focused mainly in the splenius capitis muscle on one or both sides of the back of the neck. The spasms twist or tilt the head, cause neck pain and stiffness, and may trigger tremor or headaches. It is usually chronic but treatable.
Anatomy of the Splenius Capitis Muscle
| Feature | Evidence‑based details |
|---|---|
| Structure & location | Flat, broad, strap‑shaped muscle lying deep to trapezius in the upper back of the neck. Kenhub |
| Origin (starts from) | Lower half of the nuchal ligament and spinous processes of C7–T3/T4 vertebrae. Kenhub |
| Insertion (ends at) | Fibers run upward & outward to insert on the mastoid process of the temporal bone and the lateral third of the superior nuchal line of the occipital bone. Kenhub |
| Blood supply | Mainly branches of the occipital artery (from external carotid) and the deep cervical artery. |
| Nerve supply | Posterior rami of C3‑C4 spinal nerves (sometimes C2). These are purely motor for this muscle. |
| Six key functions | 1. Neck extension (look up). 2. Ipsilateral rotation (turn face to the same side). 3. Lateral flexion (side‑bend). 4. Postural support for the cervical spine. 5. Fine head positioning for visual tracking. 6. Assists forced inspiration by raising the upper ribs slightly when neck is fixed. |
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Dystonia = a neurological movement disorder where muscles contract involuntarily because the basal ganglia and related brain circuits send the wrong signals.
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Cervical dystonia (spasmodic torticollis) = dystonia limited to the neck muscles.
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Splenius‑dominant pattern = when the splenius capitis (with or without splenius cervicis) is the main driver, causing the head to rotate toward the affected side and tilt back slightly.
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It can be primary (idiopathic or genetic) or secondary (acquired). www.aapmr.orgMDPI
Types & clinical patterns
| Classification | Example | Notes |
|---|---|---|
| By muscle pattern | Rotational torticollis (head turns), laterocollis (tilts sideways), retrocollis (tilts back), anterocollis (tilts forward), mixed | Splenius‑dominant usually presents as rotational or retrocollis. National Organization for Rare Disorders |
| By cause | Primary (isolated) vs Secondary | Secondary follows trauma, drugs, brain lesions, etc. |
| By age at onset | Child‑onset (<20 yrs), Adult‑onset (commonest, 40–60 yrs) | Adult form is more likely focal. |
| By spread | Focal (only neck), Segmental (neck + shoulder/arm), Generalised | Most splenius cases remain focal. |
Causes
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Genetic variants (GNAL, THAP1, ANO3, CIZ1, DYT6, DYT23). www.aapmr.org
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Family history without identified gene.
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Cervical whiplash or other neck trauma. PM&R KnowledgeNow
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Traumatic brain injury. Memphis Neurology
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Stroke affecting basal ganglia. MDPI
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Brain tumors.
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Oxygen deprivation at birth (perinatal hypoxic‑ischemic injury). MDPI
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Viral encephalitis. PM&R KnowledgeNow
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Wilson’s disease.
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Parkinson’s disease.
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Huntington’s disease.
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Mitochondrial disorders.
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Heavy‑metal poisoning (lead, manganese). MDPI
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Carbon‑monoxide poisoning. Memphis Neurology
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Long‑term use of antipsychotics (tardive dystonia). Dystonia Medical Research Foundation
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Antiemetic dopamine‑blocking drugs (e.g., metoclopramide).
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Anticholinergic withdrawal.
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Severe emotional stress (trigger, not root cause).
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Idiopathic (no clear trigger) — most adult cases.
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Aging‑related brain micro‑injury (theory).
Common symptoms & signs
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Sudden or gradual twisting of head toward one side.
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Pulling sensation in back of neck.
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Neck pain or burning ache. Cleveland Clinic
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Stiffness, “cramping” in the splenius region.
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Tremor or jerking (“dystonic tremor”).
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Headache at skull base or behind eye.
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Shoulder elevation on affected side.
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Uneven ear height in photos.
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Limited neck range of motion.
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Fatigue from holding the head straight.
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Difficulty driving (checking blind spot).
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Voice tremor (if laryngeal muscles co‑contract).
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Tingling from nerve root compression.
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Balance problems.
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Sleep disruption (spasms when turning in bed).
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Social embarrassment/anxiety.
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Visual disturbances (blur from jerks).
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Increased symptoms with stress.
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Temporary relief with sensory trick (touching cheek or back of head). Mayo Clinic
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Depression or low mood due to chronic pain.
Diagnostic tests clinicians may order
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Detailed neurological examination (gold standard).
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Electromyography (EMG) of splenius fibers. Mayo Clinic
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Video head‑movement analysis.
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MRI brain to rule out lesions or stroke. Cleveland Clinic
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MRI cervical spine (disc disease, myelopathy).
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CT scan if MRI contraindicated.
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Genetic panel for dystonia genes. www.aapmr.org
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Wilson’s work‑up (serum copper, ceruloplasmin).
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Thyroid studies (hyperthyroid tremor mimic).
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Metabolic panel (liver, renal toxins).
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Toxicology screen (heavy metals, drugs).
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Autoimmune panel (lupus, paraneoplastic).
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DaT‑SPECT to rule Parkinson’s if tremor confusing.
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Neuropsychological testing (cognitive impact).
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Surface EMG during posture tasks.
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Ultrasound of neck muscles (hypertrophy pattern).
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X‑ray cervical spine (alignment, arthritis).
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Blood vitamin D & B12 (neuromuscular health).
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Trial of levodopa (helps in dopa‑responsive dystonia). PM&R KnowledgeNow
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Botulinum toxin diagnostic injection (if spasm stops, confirms focal source).
Non‑pharmacological treatment options
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Physiotherapy‑guided stretching program. reactive therapy
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Gentle neck‑specific strengthening (deep cervical flexors).
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Myofascial release / trigger‑point massage.
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Heat packs to back of neck.
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Ice massage for acute flare‑ups.
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Posture re‑education (mirror biofeedback).
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Constraint‑induced movement therapy for head control.
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Kinesio‑taping to cue correct alignment.
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Dry needling (IMS) to reduce tight bands.
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Acupuncture (mixed evidence).
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Alexander Technique or Feldenkrais lessons.
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Yoga neck sequences (under instructor).
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Tai Chi for proprioception.
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Pilates spinal alignment exercises.
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Sensory trick (“geste antagoniste”) training. Mayo Clinic
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Weighted cap or light ball cap biofeedback.
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Visual biofeedback with virtual reality.
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Mirror therapy sessions.
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Vagus‑nerve breathing exercises.
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Cognitive‑behavioral therapy (CBT) for coping.
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Mindfulness meditation to lower spasm‑trigger stress.
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Ergonomic chair & workstation changes.
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High‑frequency vibrotactile collar (experimental).
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Low‑level laser therapy (photobiomodulation).
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Transcutaneous electrical nerve stimulation (TENS).
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Alternating hot‑cold showers for circulation.
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Soft cervical collar (short‑term) to rest muscles.
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Sleep pillow optimization (contoured cervical pillow).
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Diet rich in magnesium & omega‑3 (muscle calm).
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Peer‑support group (reduces isolation).
Drug treatments (always physician‑directed)
| Drug / class | Role in splenius capitis dystonia | Key point |
|---|---|---|
| OnabotulinumtoxinA | 1st‑line focal injection into splenius | Repeat every 12 wks. Blue Cross NC |
| AbobotulinumtoxinA | Alternative formulation | Dose differs. |
| IncobotulinumtoxinA | Lower protein load, good for antibodies | |
| RimabotulinumtoxinB | Option if type A fails / antibodies | |
| Trihexyphenidyl (anticholinergic) | Oral adjunct for younger adults | Cognition side‑effects. |
| Benztropine | As above | |
| Baclofen | GABA‑B agonist muscle relaxant | Oral or intrathecal pump. |
| Tizanidine | α2 agonist relaxant | Watch liver tests. |
| Clonazepam | Benzodiazepine for spasms + anxiety | Sedation risk. |
| Diazepam | Short‑term severe spasms | |
| Gabapentin | Neuropathic pain & spasm | |
| Pregabalin | As above | |
| Carbamazepine | Tremor‑dominant cases | |
| Levodopa trial | For dopa‑responsive dystonia subtype | PM&R KnowledgeNow |
| Droxidopa | Off‑label in Parkinson‑plus dystonia | |
| Amantadine | NMDA modulator | Helps some. |
| Cannabidiol (CBD) oil | Adjunct pain control, variable legality | |
| Botulinum toxin + EMG guidance | Technique to improve accuracy | |
| Steroid + lidocaine trigger‑point injections | For acute splenius knots | |
| Intrathecal morphine pump (rare) | For intractable pain |
Surgical & interventional options
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Selective peripheral denervation (SPD) — cutting the nerves to the overactive splenius and adjacent muscles. Dystonia Medical Research Foundation
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Deep‑brain stimulation (DBS) of globus pallidus internus.
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Radio‑frequency rhizotomy of C2‑C4 dorsal roots.
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MRI‑guided focused ultrasound thalamotomy (investigational).
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Intrathecal baclofen pump implantation.
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Cervical dorsal root entry‑zone lesioning (DREZ).
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Myotomy or tenotomy of splenius & sternocleidomastoid.
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Spinal fusion (only if severe secondary spine instability).
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Occipital nerve stimulation for pain component.
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Platelet‑rich plasma (PRP) injection into muscle (pilot studies).
Prevention & self‑care tips
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Treat neck injuries promptly — whiplash rehab.
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Avoid long courses of dopamine‑blocking drugs when possible.
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Limit heavy‑metal exposure (lead, manganese).
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Maintain ergonomic posture at desk & phone.
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Take regular movement breaks (2 min/30 min).
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Manage stress with relaxation training.
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Stay physically active (whole‑body exercise).
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Adequate sleep hygiene — 7‑8 h/night.
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Balanced diet with antioxidants (brain health).
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Family screening & genetic counseling if relatives affected.
When should you see a doctor?
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New neck twisting or pulling that lasts more than a few days.
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Neck pain waking you at night or getting worse.
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Head tremor or shaking you cannot control.
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Trouble driving, working, reading because your head will not stay straight.
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Prior neck injury or new medication trigger followed by spasms.
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Any neurological red flag: weakness, numbness, double vision, trouble speaking, falls, fever.
Seek emergency care if spasms come with sudden severe headache, high fever, neck stiffness, or after head injury. Mayo Clinic
Frequently Asked Questions (FAQs)
| # | Common question | Clear answer |
|---|---|---|
| 1 | Is splenius capitis dystonia curable? | Not yet, but many people get excellent control with botulinum injections plus therapy. |
| 2 | How long do botox shots last? | About 10‑14 weeks on average. Blue Cross NC |
| 3 | Will it spread to other muscles? | About 30 % of focal dystonias spread within 5 yrs; regular treatment may reduce risk. |
| 4 | Is it dangerous? | It is rarely life‑threatening but can impair quality of life and cause arthritis if untreated. |
| 5 | Can exercises fix it? | Exercise helps symptoms but usually cannot cure; think of it as part of a combo plan. |
| 6 | Do I need surgery? | Only 5‑10 % need surgery; it is reserved for severe, drug‑resistant cases. |
| 7 | What is a sensory trick? | A light touch (e.g., on cheek) that temporarily stops the spasm because it changes brain feedback. Mayo Clinic |
| 8 | Is it hereditary? | Up to 25 % have a family link; genes are still being discovered. Memphis Neurology |
| 9 | Can stress make it worse? | Yes, stress often amplifies the involuntary contractions. |
| 10 | Are there diet changes that help? | A balanced diet rich in magnesium & omega‑3 supports muscle and nerve health, but no special “dystonia diet”. |
| 11 | Do caffeine or alcohol affect it? | Caffeine may increase tremor in some; small amounts of alcohol sometimes temporarily reduce dystonic tremor. |
| 12 | Can children get splenius dystonia? | Rare but possible, usually genetic or after injury. |
| 13 | Which doctor treats it? | Neurologist (movement‑disorder specialist) plus physical therapist and sometimes neurosurgeon. |
| 14 | Is driving allowed? | Many continue to drive with treatment; discuss with your doctor and consider vehicle adaptations (larger mirrors, backup camera). |
| 15 | What research is coming? | Gene therapy, refined DBS targets, and non‑invasive brain stimulation are in clinical trials. |
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 Update: April 17, 2025.
