I almost always seem to get that lazy feeling when returning to low altitude. Like dk, I also seem to retain water for a day or two Unfortunately I don't have a solution, but drinking lots of water has seemed to help the few times I've drank a lot of water on returning (diuretics only seemed to make things worse). Although I can't help but return from a trip and reach for the beer before the water <img src="/forums/images/graemlins/grin.gif" alt="" />