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Back pain on one side only has a few broad causes. If the pain were radiating from the front of the abdomen, the scenario would have been changed to quite an extent. Most of the causes of pain on the right back, in the area you specified can be narrowed down on a clinical examination.
Possibilities with a pain in this region are of:
Nerve impingement (Radiculopathy)
Mass in the kidney
Retroperitoneal mass of any etiology
Right sided Hydronephrosis or hydroureter (swelling of the kidney or the right ureter respectively)
Hope this helps.
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