Muscle Spasm and Strain in Stiff Neck

Clinical Assessment and Diagnosis

The American College of Radiology recommends inspecting for visible muscle spasm, swelling, or bruising, and palpating for tenderness, muscle tightness, or nodules to assess muscle spasm and strain in patients with stiff neck 1
The Neurosurgery society suggests that muscle spasm is often characterized by palpable tightness in the cervical paraspinal muscles, limitation of neck motion, and pain with movement, and may be associated with occipital/suboccipital headaches 2
A thorough clinical assessment, including key history elements such as onset of symptoms, mechanism of injury, and pain characteristics, as well as associated symptoms like headache or radicular symptoms, is essential for differential diagnosis of muscle spasm and strain 2

The Journal of the American College of Radiology recommends considering further investigation for red flags such as neck pain with fever or elevated inflammatory markers, severe pain unresponsive to conservative treatment, neurological deficits, history of cancer, immunosuppression, or recent infection, and neck stiffness with thunderclap headache 1
The American College of Radiology suggests that plain radiographs may be useful for initial assessment of spondylosis or degenerative changes, but have limited value in acute muscle conditions, and imaging should be considered when red flags are present 1
The Stroke society recommends considering subarachnoid hemorrhage in patients with neck stiffness and thunderclap headache 3

The Neurosurgery society recommends progressive rehabilitation, including gradual introduction of stretching and strengthening exercises, to improve flexibility and strength and prevent recurrence of muscle strain 2
The Praxis Medical Insights society suggests that rest and activity modification, as well as NSAIDs, are effective for initial management of muscle strain without spasm 4

Cervical strain can cause persistent headache that is often occipital/suboccipital in location due to injury to neck structures leading to somatosensory dysfunction and aberrant signaling along cervical afferent pathways 5
Patients with cervical strain may have clinical signs of pain/tenderness in the cervical spine, including paraspinal and suboccipital muscle palpation, with pain/paresthesia in the occipital region during palpation or head movement 5

Injury to cervical structures disrupts normal cervical afferent pathways that travel to the brain, which are typically involved in coordinating cervical and vestibular reflexes and supporting normal vision and vestibular functioning 6
The aberrant signaling and transmission along these damaged pathways produces the characteristic symptoms of neck pain, stiffness, weakness, and persistent headache 6
Patients develop clinical signs including pain and tenderness in the cervical spine, weakness with paracervical strength testing, limitation of cervical motion, and pain with cervical movement 6

Upper extremity weakness or paresthesia may occur 6
Occipital/suboccipital headaches are common due to the cervical afferent pathway dysfunction 6
Limitation of neck motion and pain with movement are typical 6

Because cervical strain and concussion share common injury mechanisms, differentiating isolated versus concomitant etiologies is critical for determining appropriate management and treatment 6

Progressive rehabilitation with gradual introduction of stretching and strengthening exercises improves flexibility and strength and prevents recurrence, addressing the underlying somatosensory dysfunction by restoring normal cervical afferent pathway function 6