Key Difference – Polymyalgia Rheumatica vs Rheumatoid Arthritis Polymyalgia rheumatica and rheumatoid arthritis are two diseases that have a similar presentation. Polymyalgia rheumatica (PMR) is a systemic illness of the elderly people which is associated with the finding of a giant cell arteritis on temporal artery biopsy. On the other hand, rheumatoid arthritis is […]