Kidney pain generally occurs deep in the back, just below the ribcage. Also, it usually affects only on one side and it is constant, dull, and more internal. However, muscular back pain, feels like soreness or stiffness and it changes with movement. Also, kidney pain often doesn’t improve with rest, massage, or stretching. This kind of pain can be due to a kidney infection, stone, or inflammation like pyelonephritis.
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