Used mainly in medical or health-related contexts, often discussed among healthcare professionals. Not casual. The doctor noted the patient had a history of rheumatism.
Pro Tip 2/3
Chronic Condition
'Rheumatism' often implies a long-lasting, persistent illness, and it may affect people's perception of health. He was constantly managing his rheumatism; it never really went away.
Pro Tip 3/3
Age Association
Though it can affect anyone, rheumatism is commonly associated with older adults in cultural conversations. As she retired, she worried that rheumatism might limit her activities.