Final answer:
Rheumatoid arthritis mainly affects smaller joints like those in the hands and feet first. It is diagnosed by rheumatologists and can be treated with medications, exercise, or surgery.
Step-by-step explanation:
Rheumatoid arthritis (RA) is an inflammatory disorder that primarily affects the synovial joints, with the smaller joints usually being affected first, such as those in the hands and feet. In RA, the joint capsule and synovial membrane become inflamed, leading to severe disability if the disease progresses without treatment. Rheumatologists diagnose RA based on a combination of symptoms, imaging, and blood tests, and treatments vary from exercise and medications to potentially surgery to manage symptoms and slow disease progression.