What side of your ribcage is it on? If on the right, could be your liver. I can't speak for that from personal experience, but what I can speak on is, the first few weeks on the candida cleanse for me is always hell. My body hurts like it's been beaten with a bat, headaches, cranky, irritable, and a host of other issues. Basically it just goes to show you how toxic we really are. I'm sure others will tell you to try some epsom salt baths. I'm sure Dr. Bailey will have some good suggestions. Good luck. Just stick with it. It gets easier with time. Oh yes, and when I'm cleansing parasite, I actually do get pain in the area you are talking about, along with a lot of stomach gurgling. Just occured to me, so sorry for the earlier "no I haven't had that". I think it is the worm(s) going into a frenzy when they are being killed off. Both my husband and I are cleansing and sometimes you can hear our stomachs over the TV or radio. We can laugh about it now. I've even had his wake me out of cold sleep.