D20:Disabled Rules

When your current hit points drop to exactly 0, you?re disabled.
You can only take a single move or standard action each turn (but not both, nor can you take full-round actions). You can take move actions without further injuring yourself, but if you perform any standard action (or any other strenuous action) you take 1 point of damage after the completing the act. Unless your activity increased your hit points, you are now at ?1 hit points, and you?re dying.
Healing that raises your hit points above 0 makes you fully functional again, just as if you?d never been reduced to 0 or fewer hit points.
You can also become disabled when recovering from dying. In this case, it?s a step toward recovery, and you can have fewer than 0 hit points (see Stable Characters and Recovery, below).

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