What causes pain under the left rib cage?
Patient: I have had a pain under my left rib cage for three days now.  It started a couple of days prior and just got worse.  Depending on how I move the pain is more acute, and laying down makes it worse.  I do have diverticulitis, and have been experiencing a lot of gas lately. Doctor: In my opinion you have splenomegaly i recommend CBC test to check your lymphocytes count Also another possibility in cracked ribso i suggest having a chest x ray as well Good Luck