I haven't tried going in a sauna since I've been ill, but high heat and humidity in general tend to cramp up my guts pretty terribly, so I think a sauna would be a very bad idea for me. We're currently in a heat wave - 103 degrees F and very humid right now - and I've been staying in the air conditioning as much as possible, but even so I've been more crampy and feeling a bit worse than usual. Oddly enough heating pads help my guts, so I'm not sure if it's the combo of both heat & humidity together that causes me to cramp up, but at any rate I don't think a sauna would be good for me.