Please check first
If the hands become clumsy (fastening buttons, using chopsticks) and walking becomes unsteady, if both hands go numb together, or if urination is hard to control, it may be cervical myelopathy and testing is needed first.
If arm numbness comes with chest tightness, cold sweat, or pain spreading to the jaw or the left arm, it may be a heart problem and needs care immediately.
If you have fever, pain that worsens at night, or a history of cancer, other causes such as infection or tumor should be checked first.

