Do you take your medications on schedule?
It's so easy to forget, and yet taking your RA medications at the same time every day is the most important thing you can do to prevent a flare. A regular schedule helps you keep a constant, effective level of medication in your blood. Skipping doses can trigger a flare. So use a pill box, a calendar, or an alarm to help keep you on track.
If, despite everything, you feel a flare coming on, call your doctor right away. Your doctor may be able to tweak your medications to help keep RA symptoms during the flare under better control.