Why Does My Neck Hurt on One Side?

One-sided neck pain typically results from muscle strain, poor sleeping position, or nerve irritation. Sleeping in an awkward position can contribute to acute neck pain by straining muscles such as the levator scapulae and upper trapezius. Sudden movements, prolonged computer use, or carrying heavy bags on one shoulder can also strain neck muscles unilaterally. More serious causes include cervical radiculopathy, where compressed nerve roots create sharp, shooting pain down one side of the neck and potentially into the arm. Many cases of mild one-sided neck pain improve with time, relative rest, and gentle movement, but recovery may take longer than a few days.