this is Dr. David
your left breast pain doesn't sound like it is due to breast cancer
it sounds more likely to be due to acid reflux if making yourself burp relieves the pain
you could have strictures or scar tissue in your esophagus possibly causing the pain.
you may need to see a GI doctor who can do an upper endoscopy scope procedure down into your stomach to check for acid reflux damage to scar tissue in your esophagus which could be causing this left breast pain going to your shoulder blade
bad esophagitis inflammation of your esophagus can cause this type of pain.
let me know if you have other questions.
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