Can too much fast food in one day cause chest pain? Yesterday I had Hardee s for lunch and McDonald s for dinner... I was in the car for 8 hours, give me a break. I know fast food is bad for me. Today I ve been having chest pains all day. It hurts on the left side of my chest. I get chest pains like this every once in a while for no apparent reason, but it never lasts this long. By the way, I m 19, small for my age (109 lbs), have normal cholesterol and blood pressure, and no family history of heart problems.