Larryb.......I fainted more than one time during my chemo and RAD treatments. Never found the exact cause but I'm guessing it had something to do with poor nutrition and being dehydrated all the time. Seems after I got my liquid intake under control I had a much easier time with everything. I didn't know how sick being dehydrated could make a person. I guess that is why I harp on it all the time. When going through treatment the best advice I can give anyone is: Drink, drink, drink and then drink somemore. I also think Nettypoho's idea of Pedialyte is a good idea. Sincerely, Donna