what causes numb arm
Possible Causes of Arm Numbness. Numbness in the hands can be caused by fractures in the arm. This is especially likely if the numbness is in the form of a tingling sensation that is accompanied by a sharp pain in the arm, collarbone, shoulder blade, or fingers. If you have fallen or otherwise been injured recently, this could be the underlying cause of numbness.
Similarly, nerve damage in the arm can cause numbness. This may include damage to the nerves in the arms, shoulder, neck, or spine. This could be the result of blood circulation being interrupted or a nerve becoming compressed.