system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do people "feel" a storm or rain coming in, in an area where they have broken a bone or had surgery? Myself included.
gpt
Barometric pressure effects all of our internal bits as well.  When pressure changes some people get sinus pain due to the pressure change in their heads which can cause headaches.  This works the same for joints that may already be inflamed due to arthritis.  Scar tissue also behaves differently than regular tissue, it is often not as malleable.  So a pressure change in an area where tissue has been damaged might cause minor swelling where the tissue isn't as forgiving.