As DaveA said, You have to program it yourself, Health is straightforward, Try to be a lot more specific with your questions.
Here is some health (C#)
public float Health = 100f;There is health, merely a float. Now depending on what your doing you can add health, subtract health, render some gui text of health variable on the screen, or render images of a health bar on your screen depending on what amount of hp you have.
Now if you are curious as to how you subtract or add health or render it on the screen ask a question with some code your have written that is not working or just ask how you do it.
Cheers, Aaron Lewis