A pinched nerve in the neck, or cervical radiculopathy, can cause radiating pain to the shoulder, and muscle numbness or weakness that can spread down the arm to the hand. This may resolve on its own.

7. Pinched nerve If nerves in your neck are compressed or irritated it can cause a radiating pain down the arm, called radiculopathy. Radiculopathy can be caused by injury or spinal degeneration ...

Pinching of the nerve roots can cause pain and numbness in areas controlled by that nerve. Symptoms of nerve compression can occur at the site of the compression or further away from the spine.