Costochondritis

So I finally found out why my ribs have been killing me. And for those of you who don't know what it is (I didn't) here's a little explanation:

Costochondritis is an inflammation of the cartilage that connects a rib to the breastbone (sternum). It causes sharp pain in the costosternal joint — where your ribs and breastbone are joined by rubbery cartilage. Pain caused by costochondritis may mimic that of a heart attack or other heart conditions.
Your doctor might refer to costochondritis by other names, including chest wall pain, costosternal syndrome and costosternal chondrodynia. When the pain of costochondritis is accompanied by swelling, it's referred to as Tietze syndrome.
Most cases of costochondritis have no apparent cause. In these cases, treatment focuses on easing your pain while you wait for costochondritis to resolve on its own.