Pain in lower left rib when standing, pops when coughing

When I am standing, I get a large pain under my lower left rib. It feels much better when i sit down, it goes away. At first i thought this might be just a stitch but when I laugh or cough i can feel it pop. If i put my hand on it. I can feel it pop. What could this be? It has been bothering me for over a year now, and it disrupts me as i cannot stand for long periods of time. What could this be? ... click here to continue

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