Dull right sided lower back pain. hurts with movement. stops when laying on stomach but increases and is sharp with deep breath. motrin hasn't helped?

Muscle Strain: In general, pain that localizes to the side of the body originates from the muscles, bones, nerves, or skin. I suspect laying on stomach relaxes the inflamed muscle and deep inspiration activates this strained muscle producing pain. Perhaps a strained right psoas muscle? Organs to consider include ovaries, colon, appendix, gallbladder, and kidneys but pain syndrome does not match. Visit pt.

Psoas?: Psoas muscle can compress your spine when it's in a spasm. Psoas will pull femur against the ilium and ilium against the sacrum to cause sacroiliac joint dysfunction and facet (spinal joint) related pain in the spine.