Seasonal onset of polymyalgia rheumatica: correlations with the pattern of clinical presentation, disease severity and outcome in 383 patients from a single centre.

Objectives: Polymyalgia rheumatica (PMR) is an inflammatory disorder, more common in the elderly, characterised by girdle pain and stiffness, constitutional symptoms and raised serological markers of inflammation. Studies on the seasonality of onset of PMR have shown conflicting results, possibly due to the different diagnostic criteria and onset recognition. In this study, the month of onset of PMR was evaluated in patients originating from one geographical area, visited by the same clinician.