Answers:
you don't enjoy to display cold symptoms to enjoy pneumonia-
Are you a larger person- mundane happenings can break ribs. A sneeze, sleeping in a discouraging position, etc.
See a doctor
maybe you pulled a muscle short notice it. It can surface.
Do you smoke? If you do quit and see a doctor.
Could be pleurisy see if you can pop it out by continuing to breath in while it's tight ,I have similar when I be a kid but OK for ending 50 yrs.I used to verbs to inhale and the misery become great but if I go that little bit further something popped and I get instant nouns,I deliberate it be my to a degree collapsed lung inflating .See a doc tho and pls tolerate me know how you be in motion,dutiful luck.