Hand numbness is usually caused by damage, irritation or compression of one of the nerves or a branch of one of the nerves in your arm and wrist. Diseases affecting the peripheral nerves, such as diabetes, also can cause numbness, although with diabetes similar symptoms usually occur first in your feet.
Often it is caused by lack good posture. Disc problem and arthritis in your neck can cause the numbness and pain. Muscle imbalance can cause compression on the brachial nerves. As we stoop forward our anterior neck muscles will tighten to support your head and neck. These muscles (scalenes) are small muscles designed to turn your head only. When they have to support the weight of your head all day, they shorten and thicken. Here is the real problem! The nerves that go down the arms come out of the neck spine between these muscles. When these nerves are compressed they can cause the numbness in your hands
Often patient’s numb hands go away once I correct their posture and relax the anterior neck muscles. These symptoms can be confused with carpel tunnel syndrome. Before you have carpel tunnel surgery, make sure it is not coming from your neck.