Damage

Damage occurs when you hit something with another object. If a person takes 100 damage, they will go unconscious and start to suffocate. If they take 200 damage, they will die.
There are four types of damage. 
=Brute=
Brute damage can be received from getting stabbed or beaten. It can be treated with bruise packs.
=Burn=
Burn damage is received from fires and bombs. It can be treated with ointment.
=Suffocation=
Suffocation damage happens when you black out, go into an airless area without a gas mask, or go into space without a space suit. It goes away by itself over time.
=Toxin=
Toxin damage happens when you breathe plasma, eat lots of antitoxin pills, eat cyanide, or many other things. It's treated with antitoxin pills and Antitoxin suppliments.