Hi, and thank you for coming to our site with your question.
While healthy lifestyle keeps most people for getting sick - there still can be disease processes that can happen.
Usually swelling feet is indicative of your heart not working at its full efficiency.
This is something you really need to go see a doctor about as soon as you can.
It is not an emergency that you need to go to the emergency department right now - but you do need to see your doctor.
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I see you are offline.
In order to prevent you being charged extra I will change this to a Q&A type question.