RA and AS are two of the most common rheumatic diseases. AS was routinely inaccurately diagnosed as RA in the past, despite key differences in symptoms and presentation. Pain associated with RA and AS is typically worse in the morning and with rest. Exercise has been shown to improve RA-related joint pain as well as AS-associated back pain. Symptoms associated with AS usually present in individuals younger than 30 years, whereas RA symptoms typically begin at age 40-50 years. Genetic factors are associated with the development of both RA and AS, although environmental factors are also known to play a role.
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Cite this: Herbert S. Diamond. Fast Five Quiz: Mimics of Rheumatoid Arthritis - Medscape - Jul 28, 2022.