Sternum pain can result from a variety of causes. Pain felt just behind or below the sternum is called substernal pain and is sometimes.
A strain or injury are common causes of pain under the right breast, is the area where the ribs meet the sternum, also called the breastbone.
Pain under your right breast may indicate a health condition, like Sometimes this pain radiates into the back, armpit, or up to the breastbone.
If you have acute pericarditis, the most common symptom is sharp, stabbing chest pain behind the breastbone or in the left side of your chest.
A common symptom of acute pericarditis is a sharp, stabbing chest pain, usually coming on quickly. It's often is in the middle or left side of the chest, and there.