The Mayo Clinic has excellent information about Rheumatoid Arthritis: https://www.mayoclinic.org/diseases-conditions/rheumatoid-arthritis/symptoms-causes/syc-20353648.
I have almost 2 decades of experience raising a child with polyarticular JIA (6mos to 17y) without remission. ave a ton of experience with 504 and IEPs for school, prep for college and various types of meds and treatments.