Excessive movement of vertebrae in relation to other vertebrae is considered an instability. Some movement is of course normal. With instability, the movement is greater than that of adjacent segments. Spinal instability can be the result of an accident such as: a whiplash trauma, an injury, a degenerative process, surgery or a congenital disorder.
If the cause of the problem is instability, you may experience: pain, muscle spasms, nerve pain, dizziness, nausea.
Excessive painful movements of the vertebrae in the neck is considered a cervical instability.
Symptoms of cervical instability also include: acute pain in movement or posture, pain between the shoulder blades and an unstable feeling in the neck. Neck and back muscle spasms are also common in patients with cervical instability, as the muscles are overworked.