Doctors says its possible that the left side of my heart isn't getting enough oxygen. Why would this be? And is there treatment for it?

Heart. It is possible that the left side or main pumping chamber of your heart is not getting enough blood and the most likely reason for that is a blockage in one or more of the arteries on your heart. There are several ways to test for that such as and ekg or a stress test or a ct scan or MRI of your heart. Treatments vary depending on the severity and number of the blockages.