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In original Binding of Isaac, the player can have up to 12 Heart Containers and there's no limit for Soul Hearts, though they can't be seen if there's more than 12 hearts in the "Life" section. In Rebirth, the player can have up to 12 hearts in total, this also counts Soul Hearts. Note: The only exceptions for this rule is from Azazel and ?, who have -1 health, because Azazel has black hearts, and ? Has soul hearts.
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Two Health means two heart containers, and so on.
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The total number of hearts the player has.
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