What Causes Pain In The Chest On The Left Side?

Hi, I have been having left upper chest pain sporadically for the last several months. The pain is mildly sharp and comes and goes for a short period of time. It typically happens when I am at rest. I have been diagnosed with aorta regurgitation - mild. I am also being medicated for high cholesterol. There is no significant family cardiac history. I am a 56-year old female and I exercise three to four times a week. I was wondering if aorta regurgitation is causing this pain and if I should see a cardiologist.