Health, or HP is tracked twice. Once for physical health, and another for mental health. Depending on how much damage you've taken you'll either be uninjured, lightly injured, mildly injured, heavily injured and dead.
Uninjured, you've sustained no injuries. You act as normal.
Lightly injured, you're slightly beatup but you can still operate normally.
Mildly injury, you're wounded. Not enough to kill you, but it's causing a problem. -5 to everything of the same plane.
Heavily injured, you're really hurting. Not dead, but almost dead. -10 to everything of the same plane.
Dead. You're really not alive. No penalty because you're not making rolls anymore.
The distance between these is equal to your Endurance for physical health or your