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He explained why the nausea from heart strain happens. The nerves that go from your heart and stomach are connecting to the spine in the same area. So when your heart nerves are sending signals it can affect your stomach because they are so close. The tingling people get in the arm with heart attacks also happens for the proximity reason. I thought it was pretty neat and explains a lot to me about why I get nausea when in the past I really ran hard. Also explains why the tummy calms down as the heart does currently trying to regain cardio health.