I'm on my 3rd day of COLONIX and have had no problems so far...I had 4 BMs yesterday and all looked good...I am a big water and juice drinker...I havent had a soda in years...I am off coffee and beer for the cleanse...I would imagine that those that never drank water and always drank soda would give their bodies a "CULTURE SHOCK" when switching to water so quickly...the pains could be chunks of BUILDUP of some sort breaking away when the avalanche of wtare was introduced...I have read in DR. JENSEN's book that you should SIP water not swallow a gallon at a time, LOL.