Flares can be caused in various ways, from something eaten, physical stress, emotional stress, or impact to the back (such as from a bump or sudden/excessive movement). Before I started the no-starch diet (NSD), one day without pain was a rare blessing. If you want more info about NSD, check out this site or just ask.

--Greg

AS symptoms started 1991. Official dx in 2006 with HLA-B27+, fused SIJ, bone spurs in back, extreme rib/hip pain, and other family with SpA. Started Enbrel in 2006 with good results, but stopped in 2010 due to nerve damage (MS) from it. Getting good results with no-starch diet since 2011.