causes of numbness in arms
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.
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. In very uncommon instances, numbness can be caused by problems in your brain or spinal cord, although in such cases arm or hand weakness or loss of function also occurs. Numbness alone is only rarely associated with potentially life-threatening disorders, such as strokes or tumors.