Hi my grandfather has been in the hospital for hip surgery for the last 3 1/2 weeks. Following the surgery, he started to have explosive diarrhea even though he has not really had much of an appetite . He has always been one to have a hearty appetite so we thought that it was just stress from surgery. We chalked the diarrhea up to a reaction to the post surgery antibiotics . However, it has been non stop now. Every night. And it is mostly liquid. However, the other night, mixed with the liquid were these perfectly round, marble sized balls which looked white/off white in color. Any idea what this could be? Thanks