I have heard even the Allopathic Doctors say, our heart condition– bitterness, unforgiving etc effects body. Read Bible, seek Jesus.He helps the helpless.

check out mayo clinic, it has a lot of great info

it could be any number of things, arthritis being amongst the unlikely ones unless you’re either a: quite old or b: genetically prone to early onset.

see a good sports doctor or physio, it may be cureable, particularly if you’ve got a dodgy running technique or the wrong trainers.

good luck!