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what causes severe middle back apin and numbness in arms and legs
There are host of causes that can affect the spinal column, spinal nerves or peripheral nerves. These causes are discussed in this article : http://www.healthhype.com/numbness-and-tingling-in-both-arms-hands-and-legs-feet.html
If accompanied by back pain, there is a possibility that this is arising due to the compression of the nerves at the point that it emanates from the spinal column (nerve root compression). This can occur for a number of reasons, like a bulging disc, spinal stenosis and so on. You need to see a doctor who will conduct further investigations to diagnose the cause. This varies among individual cases so there is no definitive answer to your question. Other possibilities could be related to nerve damage due to diseases like diabetes mellitus or even circulatory problems.