I am writing because, for six to seven weeks, I have been experiencing sporadic breastbone pain, and I am unsure of its cause.
The pain, which I feel (only momentarily) perhaps six or seven times per day, feels like it's originating in the breastbone itself, rather than in the cardiovascular system. The closest analogy I can give to describe the pain is this: the discomfort that results if you have a tender black-and-blue mark, and somebody uses their finger to press on it.
The pain is always in the same spot: the center of the upper mid-sternum, perhaps three or four inches below the collarbone, and an inch or two above nipple line.
I've not noticed a consistent pattern for when the pain materializes. Sometimes, if I lift something heavy, I feel it. Sometimes, I feel it just sitting in a chair. Sometimes, I feel it when bending down and getting on my knees. It doesn't seem to have to do with physical exertion in the sense of exercise or getting my pulse rate up: I was running around, carrying my nephew, and I didn't feel the pain. However, I felt it upon picking up my PC tower.
Any idea what the cause might be?