Poison (status effect)

Poison is a deadly infection which can affect Mario through various means. It is induced mostly by exotic animals or enemies attacking him. There are some foods that are poisonous too. Poison is mostly used in the RPG games and rarely in other titles. Poisoned characters or enemies will take a few HP worth of damage every turn for a number of turns.

In Super Mario RPG: Legend of the Seven Stars, this is one of the few conditions the party can inflict on enemies. Bowser is able to do this with his Poison Gas attack. In the Paper Mario series, whenever Mario (or anyone else for that matter) is poisoned they usually turn green. In Mario & Luigi: Superstar Saga, they can turn white, purple, or pink, in order of the severity of the poison. In Mario & Luigi: Partners in Time and Mario & Luigi: Bowser's Inside Story, poison is indicated by that character's color scheme darkening to purple. The victim will lose HP every turn unless they faint, use a Refreshing Herb, or until the battle is over.

In other games there's an item called Poison Mushroom. If eaten, the Poison effect will be making a character shrink, lose health, become poisoned or die.