Beverleyhills,   Thanks for your question.   First of all I want to assure you this is unlike to be your heart as the cause.   It sounds like your problem is in the chest wall itself, which moves with every breath.  This could be a bruised, cracked, or broken rib.  It could also be a muscle or ligamentous injury between the ribs.  A more serious problem could be in the lining of the lung, or lung itself.    The best way to sort this out is to see your physician who will perform a short history and examine you.  Then he/she will be in the best position to tell what the problem is.  So call for an appointment to be seen as soon as possible.   In the meantime, try some over the counter ibuprofen as long as you have no stomach problems.  It you do, then tylenol would be next on the list.  Use of a heat will also alleviated some of the discomfort.  Brace your chest with a pillow when coughing or sneezing.   Best wishes.   Martin Cane, M.D.