Webfluttering sensations in the rib cage can have many causes, and your gp is the best resource to provide answers, alleviate worries, and guide you towards. Webdiaphragm flutter — also known as diaphragmatic flutter or diaphragmatic myoclonus — is a rare disorder in which your diaphragm experiences repeated. Webyour spleen is an organ that sits just below your left rib cage. Many conditions — including infections, liver disease and some cancers — can cause an. Webwhat’s causing pain under my left ribs? Broken or bruised ribs.