Tietze syndrome: Tietze's syndrome is inflammation of the cartilage that joins your ribs to your breastbone (sternum). Cartilage is tough but flexible connective tissue found throughout the body, including in the joints between bones. It acts as a mould and a shock absorber, cushioning the joints. http://www.nhs.uk/conditions/tietzes-syndrome/Pages/Introduction.aspx
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.