Introduction 

What if a painful, twisting neck is not merely “muscle strain” but a deeper, hidden neurological condition? Cervical dystonia (also known as spasmodic torticollis) is a neurological movement disorder, specifically a focal dystonia subtype, that causes involuntary muscle contractions, resulting in abnormal postures, pain, and discomfort in the head and neck. Most cases have an unknown cause (idiopathic), stemming from abnormal signalling of the basal ganglia.¹ 

Symptoms like neck pain or stiffness are common initial signs. They are hard to identify from neurological movement disorders like Parkinson’s disease, essential tremors, and musculoskeletal conditions like cervical spondylosis and myofascial pain syndrome. These overlaps in symptoms could make an accurate diagnosis particularly challenging without neurological and orthopaedic expertise, resulting in frequent misdiagnosis and delaying proper management. While having a precise cervical dystonia diagnosis is not only about targeted, effective treatment, it is also about preventing unnecessary mistreatment for the sake of quality of life.^1,2 

This article will explore the clinical features, progression and varieties of treatment towards those movement disorders and musculoskeletal conditions that are often confused with cervical dystonia, to untangle the diagnostic complexities for timely, accurate care and confidence for those with this debilitating condition. 

Movement disorders that may be confused with cervical dystonia 

Due to its overlapping clinical features, cervical dystonia is often misdiagnosed, as it shares symptoms like abnormal neck positions, tremors, or stiffness with several movement disorders. 

Essential tremor

Essential tremor (ET) is one of the most common conditions that is confused with cervical dystonia due to the presence of head tremors. While ET are usually rhythmic shaking of the head, often described as a “yes-yes” or “no-no” movement, abnormal head postures are usually absent in cervical dystonia.^1,3

ET is also more likely to affect hands and arms alongside the head, voice and other body parts, whereas cervical dystonia is localised to the head and neck. ET can respond to alcohol intake or beta-blockers like propranolol; however, cervical dystonia is more likely to be reduced through sensory tricks like touching the chin, which do not apply to ET.^1,3

Parkinson’s disease with dystonia 

Parkinson’s disease (PD), as a neurodegenerative disorder, may be accompanied by dystonia at the early stage or as a complication of long-term dopaminergic therapy. While cervical dystonia-like symptoms, such as a tilted head, neck rigidity, and stiffness, may occur, they are usually accompanied by classic PD symptoms, including slowed movements (bradykinesia), resting tremor, and rigidity affecting the whole body, which are not prominent in isolated cervical dystonia. Cervical dystonia is usually focal to the head and neck. Dystonic symptoms in PD also tend to fluctuate with medication intake, as well as task-specific or dose-related. These Parkinsonian signs are exceptionally helpful in differentiating PD-related dystonia from isolated cervical dystonia.^2,4 

Myoclonus

Myoclonus is characterised by sudden and brief involuntary muscle twitches that can affect the neck, sometimes resembling the jerky movements associated with cervical dystonia. Despite the existence of myoclonus-dystonia syndrome, which can further blur the lines, they are rapid, shock-like movements without sustained postures. Cervical dystonia is a repetitive contractions that cause abnormal head and neck positions. While treatments are generally not required for myoclonus that can resolve naturally, cervical dystonia is progressive and can only be partially relieved by sensory tricks. Myoclonus is also more likely secondary to various neurological conditions than being an isolated disorder, such as cervical dystonia. 

Tardive dyskinesia

Tardive dyskinesia (TD) is a long-term complication from the use of dopamine-receptor blocking agents, such as antipsychotics (neuroleptics). It involves uncontrollable neck movements that can be very similar to cervical dystonia. However, they can be clearly identified in several aspects. TD is the stereotyped or choreiform, repetitive, tremor-like activities more generalised to orofacial, trunk, and even limb muscles, which have a clear history of neuroleptic exposure. Cervical dystonia is a more localised and sustained abnormal posture of the head and neck, not directly associated with drugs. While TD is more often present with involuntary orofacial movements like involuntary lip smacking, chewing, and tongue protrusions, these are not typical for cervical dystonia. TD also often emerges after a period of medication use. The recognition of a clear drug history is therefore crucial in differentiating TD from cervical dystonia.

Functional movement disorders (FMD)

Dystonic-like movements in functional (psychogenic) movement disorder (FMD), showing up as abnormal neck postures, repetitive twisting, or tremor, may sometimes mimic cervical dystonia. However, unlike true dystonia, symptoms in FMD are usually inconsistent, distractible, and may either improve with suggestion or when an individual is unaware of being observed. With a lack of fixed abnormal postures and the typical variability across examinations. Careful clinical assessment, recognition of psychological or stress-related factors, and accordance with DSM-5 are essential in distinguishing FMD dystonic movements from neurogenic cervical dystonia.^5,6,7 

Musculoskeletal conditions that mimic cervical dystonia 

Other than primarily being a neurological condition, typical symptoms of cervical dystonia, like neck pain and stiffness, can sometimes be mistaken for musculoskeletal disorders. 

Cervical spondylosis 

Cervical spondylosis, or degenerative arthritis of the neck, is an age-related wearing and tearing of the cervical spine that causes neck pain, stiffness and muscle spasms with limited range of motion in the head and painful neck movements, which can be confused with cervical dystonia. For cervical spondylosis, structural abnormalities like osteophyte formation, disc degeneration, or spinal canal narrowing are typically detectable through imaging scans like X-ray, CT, or MRI. Neurological signs like dizziness, headache, weakness or numbness may appear when nerve roots are compressed. Yet, in cervical dystonia, involuntary, sustained contractions or jerky movements happen. Clinical findings and radiological evidence are the key to distinguishing between the two.⁸ 

Muscle strain 

Acute or chronic muscle or ligament strain near the neck or shoulder region can induce localised pain, muscle stiffness, and compensatory abnormal postures. These can superficially look like head tilting or neck twisting in cervical dystonia. Muscle strains are followed by a clear history of overuse, poor posture, or trauma, with discomfort improved by the RICE method, physical therapy, and simple pain relievers, typically within weeks, whereas dystonic contractions are sustained despite a change in posture or rest. Muscle strain also lacks the involuntary spasmodic or jerky quality that accompanies cervical dystonia. Clinical history and how the symptoms change over time would be the key to differentiating the two conditions. 

Non-dystonic torticollis 

Torticollis (wryneck) is the neck muscle tightness and twisting that occurs in infants. It can be congenital or acquired. It can easily be mistaken for cervical dystonia as it causes the head to tilt or turn at an odd angle. However, stemming from thickening or shortening of the sternocleidomastoid muscles (SCM) that lead to persistent head tilting without abnormal fluctuating contractions. Acquired torticollis developed from trauma, infections, or visual problems also lacks the tremor, painful spasms that are slowly progressive and irrelevant to injury. A thorough history and examination of the muscular structures is the key to identifying the differences. 

Treatment options 

Management of cervical dystonia is considerably different from other neurological movement disorders and musculoskeletal conditions. 

Medications 

Cervical dystonia is often primarily managed by botulinum toxin injections, the gold standard that directly reduces excess muscle activity. A trial of beta-blockers like propranolol or anti-seizure drugs like primidone is used before botulinum toxin for ET, while dystonia in Parkinson’s disease is treated by anticholinergic medications and levodopa. Myoclonus benefits from antiepileptic drugs, and TD is managed by either stopping or switching antipsychotic drugs or with vesicular monoamine transporter 2 (VMAT2) inhibitors. Medical treatment has been limited for FMD due to its non-progressive nature. 

Physical therapy and rehabilitation

Musculoskeletal conditions like cervical spondylosis, muscle strain, and non-dystonic torticollis are primarily improved by the RICE method, physical therapy, over-the-counter pain relievers (e.g. NSAIDs) and soft collar or brace. They differ from cervical dystonia as they respond well to rest and conservative measures, but cervical dystonia requires targeted neurological interventions. 

Psychological and multidisciplinary approaches 

Treatment for FMD is notably different from those neurodegenerative and musculoskeletal pathologically-targeted treatments. By which, it stresses physical therapy for normal movement retraining, psychoeducation and psychotherapeutic support like cognitive-behavioural therapy (CBT) in restructuring unhelpful thoughts. 

Surgery 

For severe and refractory cases where medications and physical therapy are inadequate, deep-brain stimulation (DBS) may be considered for cervical dystonia, PD, ET, and myoclonus. While targeted operation may be provided to those myoclonic cases stemming from a tumour or from damage to the brain, spinal, face or ears. They are rarely found in musculoskeletal issues, despite spinal fusion being needed when structural compression is triggering complications like cervical myelopathy or radiculopathy in advanced cervical spondylosis. 

Summary 

Cervical dystonia is a neurological condition that is distinct from various movement disorders and musculoskeletal issues. Despite common similarities of neck stiffness, pain, and abnormal postures, they are primarily differentiated by the more generalised or symmetric symptoms in other movement disorders, or structural abnormalities or clear injurious history upon musculoskeletal conditions, compared to the involuntary spasms and abnormal head postures in cervical dystonia. 

Having general awareness of these differences can encourage earlier clinical advice, seeking with neurologists for an accurate diagnosis and timely treatment, rather than simple assumptions. Ongoing genetic and brain pathway research can promote new medications and advanced neuromodulation development for better personalised therapies and treatment outcomes in the future. With proper diagnosis and treatment, many people with cervical dystonia manage their symptoms effectively and maintain a good quality of life.