Elderly onset rheumatoid arthritis (EORA) is defined as rheumatoid arthritis (RA) with age of first onset 65 years or over. It comprises an acute onset proximal or large joint arthritis with a prominent systemic syndrome characterised by constitutional symptoms and a higher ESR than in the younger patient with RA. Investigations should focus on trying to establish the cause and ruling out differential diagnoses. They should include inflammatory markers, serum uric acid, full blood count, rheumatoid factor/anti-CCP antibodies, and X-rays of the affected joint as well as the hands and feet. The possibility of malignancy should always be borne in mind. NICE recommends urgent referral of all suspected cases.