Breastfeeding-related onset, flare, and relapse of rheumatoid arthritis.

The beneficial effects of pregnancy on rheumatoid arthritis have been known for decades. Only recently, however, have lactation and prolactin been targeted as predictors of onset, flare, or relapse of arthritis. Among genetically susceptible women, breastfeeding is associated with an increased risk of rheumatoid arthritis, particularly after the first pregnancy. Dietary interventions may reduce symptoms experienced by arthritic women.