Fell down stairs, hit lower shoulder, do not have extreme pain but i have had pai when running and jogging ever since should i be worried?

Check it: I'd have it checked with your pcp & consider getting an x-ray if it continues to bother u.

No: I would not be worried. At some point, though, if it does not resolve i would consider getting it checked, or certainly if it associated with any respiratory symptoms i would be seen. You might have stretched some ligaments in your shoulder and, like a sprained ankle, your symptoms could very well resolve. Thank you.