I'm experiencing this pain on the backside when I take deep breaths, and it's also there, but milder, when I breathe normally. It's been going on for a while, and I'm not sure what it could mean. Should I be worried about this, or is it something that usually goes away on its own? What might be causing it?

It sounds like you may be experiencing muscle strain or inflammation in the ribcage or intercostal muscles, which can cause pain during deep breathing. However, it's important to rule out any underlying conditions, such as lung or kidney issues. I recommend seeing a healthcare professional for a thorough evaluation.