Diaphragm causing left shoulder pain after meals?

It can. This can occur. If you have a hiatal hernia that is causing irritation after you eat, you can have referred pain in your left shoulder or axilla (armpit) area. You may need an upper GI series or endoscopy to make sure you are not having any other issues such as progressing barretts esophagus or any other issues. Hope this helps!

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Severe left shoulder pain by corner socket cannot lift shoulder/arm all the way up what could be possible cause?

Rotator cuff. If recent onset, a rotator cuff injury is a possibly. If a longstanding problem, arthritis is a common cause of decreased shoulder motion. Have it checked out by an orthopedic surgeon. Read more...