Immune: constructs, undead
Creatures with the nauseated condition experience stomach distress. Nauseated creatures are unable to attack, cast spells, concentrate on spells, or do anything else requiring attention. The only action such a character can take is a single move actions per turn.
Marius, Scholai Armsmaster Says: Nausea effects are usually localized to a specific area, such as inside a Stinking Cloud or next to a smelly monster. Use your move action to get away.