Numbness is usually due to the lack of blood flow to that area or nerve damage in that area. While it is generally not serious, it can be indicative of a more serious problem. If this has occurred several times and lasts for a while, you need to have this checked by a doctor.
May I ask you a question? What are you usually doing when your arm goes numb? It may sound sort of silly, but when I sit on the couch or a comfy chair because of my scoliolsis, I tend to lean to the left a lot. That always put pressure on the left arm somewhere ,& I too get a lot of numbness in my hand ,& outer 2 fingers. Another thought is that you could have carrpel (sp)tunnel syndrome which caues pain & sometimes just numbness. A nerve conduction study by a neurologist would confirm or deny this condition. Just some thoughts...
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