Hi, Lois, The diarrhea could be from chemo, or the peg nutrition [or lack of] going in his system,[ or possibly a "bug, but doubtful]". John had diarreah and constipation on alternate "days" depending on how you counted. Buzz's fluid intake will be a battle from here on out. It would be good to stock up on Pedialyte [Baby section-grocery store] to pour down that peg as often as possible. You may find that he will need to be hydrated at the ER on occasion. My bet is that it is the combo of the chemo and Rad and peg foods. Those things are a shock to anyone's system. Amy in the Ozarks