I have had a pain in my chest for over 24 hrs.? I have had a real bad pain in my chest for the past 24 hrs or longer. It feels like a stich in my chest on the L hand side and is worse when i breathe in. I am only 25yrs old and i am a smoker, quite heavy. The pain is bad and woke me this morning. Ive had it b4 but not for this duration. Any idea what it could be. My boss said maybe heart burn but i havn t had any spicy food or anything like that??!! Im worried!