I am getting discomfort feeling on my left side ribs. it is not painful. i have done chest x-ray. ultrascan, endoscopy and sigmoidoscopy, but all ok.

LUQ anatomy: Anatomically, the left upper quadrant (LUQ) of abdomen includes: spleen, pancreatic tail, stomach, descending duodenum, splenic flexure of the colon, associated vessels. Don't forget the diaphragm, heart, and lower chest are pretty close by. The abdominal musculature, ribs, and skin can all contribute as well to localizing LUQ pain. Further testing appropriate for clarity of diagnosis & treatment.