Fibromyalgia patients often show Symptoms of Costochondritis which include: Pain in the ribcage and chest which worsens with exercise or any activity. Pain when inhaling deeply, sneezing and coughing due to stretching of the inflamed cartilage. Pain radiates from the chest to the arms and shoulders and, in this manner, mimics a heart attack. Pain is often accompanied by inflammation or redness, a condition known as Tietze's Syndrome.
There is a symptom of Fibromyalgia that is rarely talked about, yet is very prevalent among sufferers and quite scary at the first onset. It is called Costochondritis. It is a chest pain that can be sharp and jabbing. It can easily be mistaken for heart problems including heart attack and stroke. Actually it is the cartilage between the ribs and the chest bone becoming inflamed and sore. -- http://bodyprinciple.wordpress.com/2010/07/04/costochondritis-in-fibromyalgia/