Have you had any kind of a fall lately, or lifted anything heavy? Two times in the past I've developed rib pain days after I did something that didn't seem major at the time. One time I sprained some muscles lifting a wet cinder block several days earlier. Last year I broke a rib taking a minor spill from a very slow speed turn while I was on a 30 mile bike ride. Got up and finished the ride. Didn't start becoming truly painful til the next week.
Just a thought.



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