<Li> An upright posture for long periods of time (e.g. standing in line, standing in a shower, or even sitting at a desk). </Li> <Li> A warm environment (such as in hot summer weather, a hot crowded room, a hot shower or bath, after exercise). </Li> <Li> Emotionally stressful events (seeing blood or gory scenes, being scared or anxious). </Li> <Li> Astronauts returning from space not yet re-adapted to gravity . </Li>

Why do i get nauseous when i stand for too long