Rheumatoid arthritis (RA) is a form of arthritis and an autoimmune disease. An RA flare, also known as an exacerbation, is when a person experiences transient worsening of their RA symptoms—such as ...
Sudden onset joint pain can be due to a newly acquired condition or a long-term disease that flares up to cause sudden pain. Some causes include arthritis, infections, and chronic conditions like ...