Folia Med (Plovdiv). 2007;49(3-4):5-12. Rheumatoid arthritis and thyroid abnormalities. Staykova ND. Relationships between rheumatoid arthritis (RA) and the thyroid gland have been studied extensively for a long time. The studies of this problem have focused mainly on: (a) the functional and immune thyroid gland abnormalities in patients with previous history of RA, and (b) joint [...]