for two and a half days, when i breath in i felt an uncomfortable, slightly painful feeling in the upper chest, that ultimately made it a little complicated to completely breath. When i went for a second deep breath the slight pain/ache would go away. Then i would breathe softly, then proceed to breathing deeply agin, an the ache would return. Not it has slightly resided and there is a small bony lump in the middle of my chest below my collar bone, no pain felt.