From the heart arises the great blood vessels like the aorta. The heart lies behind the breastbone and protrudes from either side of it, with more of the heart extending to the left than the right side. ![]() There are several ligaments that attach in and around the breastbone like the costo-clavicular ligament, sterno-clavicular ligament and chondro-sternal ligament. Sprain is where a ligament is injured or inflamed usually be excessive stretching.It is inflammation of the tendon and is also often associated with muscle strain and excessive stretching. Tendonitis is one of the common tendon problems.The pain that arises is usually exacerbated on movements involving the use of the affected muscles. The muscle may go into spasm, become inflamed or even tear. Strain is where the muscle is overexerted.Ligaments are bands of tissue that provide stability and support to joints and lie close to the tendons. Muscles connect to the bones through tendons. The most prominent is the pectoral muscles on top of which lies the breasts. There are several muscles that lie over the ribcage or connect to different parts of it. Rheumatoid arthritis (RA) and osteoarthritis (OA) are the two more common forms of arthritis. This may be the cause of pain between the breasts as numerous joints are formed where the clavicle (collarbone) and ribs meet the sternum (breastbone). Arthritis is the term for joint inflammation which often presents with joint pain (arthralgia).When swelling is also present then it may be Tietze syndrome. It causes pain usually with no other symptoms. Costochondritis is inflammation of the costal cartilages which connect the ribs to the breastbone.Other bone fractures may also give rise to pain in and around this area. ![]() The sternum (breastbone) may fracture with a blow to the chest and is more likely to be seen as a consequence of a car accident injury.
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