This is my second year of riding my bike. Last year I noticed that when I am on a bike for a "long" time, say more than two hours, but sometimes as little as one hour my lungs/diaphram start to get sore when I breathe in past a certain point. I think that this point starts to get shallower and shallower as time goes on.
It's not a very sharp pain, but is very annoying. It's basically about the middle of my chest and it almost feels like I have a sore muscle. Sometimes it even still hurts the day after, like now.
-I remember getting this feeling when I was a kid if I swam at a pool for a long time, although it was never as bad as it gets on a bike
-I've run two marathons in my life (not super fast, but still) and I only RARELY get this problem running, and then it's very minor.
-No one else I ride with experiences these symptoms
-I've asked multiple doctors about it and they don't know either
Does anyone else experience this and/or know what it is?