Neck spasms are commonly accompanied by muscle tightness, pain that ranges between achy or sharp, and/or neck stiffness. While most neck spasms go away on their own, sometimes they linger and the underlying cause must be diagnosed and treated.
Potential Neck Spasm Causes
The underlying cause of a neck spasm may be:
- Neck strain or sprain. A small tear or strain in a neck muscle can cause it to tighten and/or spasm as a protective mechanism against stretching too far. An injury or sprain to a nearby ligament may cause a reflex muscle spasm where the non-injured muscle tightens in order to protect the nearby injured ligament.
- Overexertion or fatigue. When a muscle is overworked, it is at increased risk for developing pain and going into spasm. Some evidence suggests that muscles worked in high-temperature environments are also at an increased risk for muscle spasms.1
- Herniated disc. If an intervertebral disc herniates in the cervical spine and starts leaking inflammatory proteins, nearby muscles in the neck can become inflamed and painful, causing them to spasm.
- Facet joint osteoarthritis. When the facet joint’s protective cartilage starts wearing away, the adjacent vertebrae start grinding against each other. Bone spurs (osteophytes) can grow in an attempt to stabilize the joint, which increases inflammation and the risk for nerve compression, both of which may contribute to neck spasms.
- Mechanical dysfunction. Any type of mechanical dysfunction that prevents the joint from going through its normal range of motion can increase the likelihood for muscle spasms. This type of joint dysfunction can have many causes, such as bone spurs, injury, poor posture, or congenital abnormalities from birth.
- Peripheral neuropathy. Nerves that branch outside of the spinal canal and feed into the various parts of the body are called peripheral nerves. If a peripheral nerve in the neck becomes damaged—such as from disease or a lesion—it may malfunction by sending too many signals, altered signals, or fewer/no signals. Peripheral neuropathy can potentially lead to various problems with sensory, reflex, and motor functions, including muscle spasms.2
- Myofascial pain syndrome. This chronic condition occurs when painful trigger points develop within the muscles and/or their connective tissues (fascia). When this condition occurs, muscles in or near the neck are commonly affected. The muscles can become tight and spasm, and pain may increase and spread up into the head or further down the shoulder, arm, and/or upper back when a trigger point in the neck is touched.
- Stress or anxiety. The physiological effects of emotional stress and anxiety have been linked to neck muscle tension and pain, which can also include spasms.
- Cervical dystonia. This rare and painful disorder, also called spasmodic torticollis, involves the neck involuntarily rotating to the side and/or tilting. It can occur at any age but is more likely to develop after age 40.3 The cause of cervical dystonia is not fully understood, but there may be a genetic component as it tends to run in families. Other causes have also been suspected, such as a brain injury.
Other causes of a neck spasm are possible. Sometimes the cause of a neck spasm is not known, in which case it is considered an idiopathic muscle spasm.
If a neck spasm keeps recurring or causes enough pain or stiffness to interfere with daily activities, it is advised to visit a doctor for further evaluation.