In my personal experience, I've had flares triggered for no apparent/obvious reason. No infection, sunlight, stress, etc. I'm sure many here will report similarly 
I can also vouch that some of my worst flares have occurred following infection and heavy stress as well as too much sunlight/too much activity in a single day. Additionally, rapid swings in the weather and temperature do seem to affect me as well in recent years. Something I hadn't really noticed much before.
I can also vouch that some of my worst flares have occurred following infection and heavy stress as well as too much sunlight/too much activity in a single day. Additionally, rapid swings in the weather and temperature do seem to affect me as well in recent years. Something I hadn't really noticed much before.
