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Get it Xrayed.
If its just cracked you'll be OK. If its properly broken you shouldn't. If you have a fall theres a possibility you could puncture your lung - and you really dont want to do that.
TBH I'd say you've probably just cracked or bruised it. The difference between a cracked rib and a broken one in terms of pain is on a scale of about a million (Yes I've done both). Trust me - you wouldn't breath unless you had to with a properly broken rib.
i once dislocated my bottom rib falling off a horse, and the horse stood on me (yes apparently, it is possible) and didn't realise what I had done. After 10 days it was still as painful as the day I did it so I bizzarely went for a 2 mile run. The pain after half a mile was indescribeable but I carried on. When I got home, I got into a hot bath, leant forwards, heard a crack, felt something move and was in the worst pain of my life. My rib had popped back in and I never had a problem with it again
I wouldn't recommend doing any exercise as the pain I was in on my run was awesome. Rest and painkillers I'm afraid!
broke 2 ribs left side on the 12-12-12.have had x.ray.doing a spring marathon' when will i be able to run again.was told at hospital 4-6 weeks