Stabbing pains on lower right side of back?

Depends. Kidney pain usually present with localized tenderness at the bilateral flank regions, which may radiate to the lumbosacral spine and inguinal area. The pain usually presents as dull, achy, constant, cramping pain, with intermittent sharp stabbing pain .However, musculoskeletal pain due to muscle spasm usually presents with dull spasm to sharp pain reproducible with palpation, and position changes.
May be from. muscles and bones and if it goes down the leg indicative of sciatica. could be musculoskeletal.