Rheumatoid Arthritis Support Group
Rheumatoid arthritis is a chronic, inflammatory, multisystem, autoimmune disorder. It is a disabling and painful condition which can lead to substantial loss of mobility due to pain and joint destruction. The disease is also systemic in that it often also affects many extra-articular tissues throughout the body including the skin, blood vessels, heart, lungs, and...

Thank you!
Yes RA "can" affect any joint but I believe the medical community states on "average" they don't affect the joints at the very tip of your fingers. I read for a while that it doesn't affect the lower lumbar of the back because we supposedly don't have any synovian fluid around those discs but there are ligaments that attach to those discs that DO carry the fluid around them (somehow).
I've had my jaw affected as well although that was early on in the disease, hasn't really ever come back in that area. Generally they say it doesn't affect the "larger joints" hips, back ect. but it can.
Where you will mostly feel it is in the larger hand knuckles, wrists, elbows, shoulders, toes & ankles.
"The only thing consistent with my RA is it's inconsistency"!
To this day my right wrist, pointer and middle fingers are the places my RA likes to "attack" often. I think we each have our own journeys, no two seem to be alike, but you are not alone, stay strong and positive!!
Definition of small joints. Small joints include the metacarpophalangeal, proximal interphalangeal (PIP), second through fifth MTP, and thumb IP joints, and the wrists. They do not include the first CMC, first MTP, or DIP joints, which are often affected by osteoarthritis.
Definition of large joints. The term “large joints” refers to the shoulders, elbows, hips, knees, and ankles.
Determination of the joint pattern category. Patients are categorized according to the number and location of involved joints by placing them into the category with the highest possible score. For example, a patient with involvement of 2 large joints and 2 small joints is placed in the category “1–3 small joints,” as this category has the higher score. Patients should be scored for their joint involvement assuming that all of the peripheral joints indicated above have been assessed. For the highest category of joint involvement, in which 10 joints must be involved (including at least 1 small joint), additional joints that can be considered for inclusion in this count include the temporomandibular joint, sternoclavicular joint, acromioclavicular joint, and others that may be reasonably expected to be involved in RA.