Many people with neck pain say their arms feel weak. If weakness is
related to neck pain, you will be able to make your arm muscles work, but it
will probably hurt.
True weakness means you are not able to use your arms or legs
normally, no matter how much you try to push through the pain. This may be
caused by a problem with the structures in the neck, such as a
herniated disc.
Pressure on the spinal cord itself rather than just on specific
nerves connected to it can cause weakness in one or both arms as well as in the
legs. Weakness is a sign of a more serious problem if it is present in both
arms or both legs rather than one arm or one leg. It also is more serious if it
affects both the arm and leg on one side of the body at the same time.