He Is Having Pain On The Left Side About 6

He is having pain on the left side about 6 inches to the left side of the belly button. He passed some kidney stones a few weeks ago at home on his right back side area. The appendix was removed in 2011. His appetite is good, bowel movements are good. He does remember while mowing the lawn he leaned over the mower to remove some sticks and wonders if this could be a pulled muscle. It does hurt to the touch.