Does anyone know if a gastrointestinal infection can trigger an endo flare up? I was sick with vomiting (sorry tmi) and felt better. Now I'm in a lot of pain and I was thinking that the infection triggered an endo flare up? Is it possible? I'm just after my period (taking COC). I'm trying to find the causes for pain other than periods (the pain is usually Worse before and during periods/ second part of cycle. sometimes a couple of days after period) I'm going back to my gyn in december to discuss the next step since I'm still in pain despite taking OC and naproxen. I don't know if endometriosis is the reason for my pain but I would really like to find the cause. This is affecting my life a lot.