pjcag,
Thanks for the question.
I have never heard someone describe that symptom, and I suspect that you have unintentionally omitted details that may be important.
What you need is a good history and physical to help sort this out, something that cannot be provided over the internet.
Regarding whether or not this could be "fluid from your heart" cannot be definitively answered without a physical, but I would conjecture that the chances are low.
If you are indeed having chest tightness or discomfort, you should be evaluated by a doctor soon to assess the possibility of a heart attack or its precursor.
hope that helps.
I have the exact symptom of a tight feeling under my breasts. I cannot wear a bra that is even a little tight. I have had a history of heart problems but my Doctor says he has never heard of anyone with this symptom before and doesn't seem concerned.
Let me know if your Doctor gives you any reason for this feeling. I don't have it all the time but have had it for a long time with no bad aftereffects if this eases your mind at all but it is very uncomfortable.
I can be reached by e-mail at ***@**** if you wish.
Terry