The infection
Life is gangrene. It is a severe case of gangrene. At first, you notice your toe hurt a bit. a couple of weeks later it hurts more, then you go to the doctor and he cuts your toe off. A couple of weeks later your leg hurts, you decide to ignore for the time being and continue with your life. A couple of weeks later the doctor has to take your leg off. Soon the pain hits quicker and harder and you find yourself on your last breath or it'll spread slowly making sure that you suffer for as long as possible.
That's what life is like. At first the things that trouble you aren't that serious and if you ignore them for long enough the pain seems to disappear. The catch being that it comes back to take your whole leg (not literally). Soon new pains arise and it causes you to hurt all the time from some unknown infection which you thought that you had defeated a long time ago. Soon it hurts so much that you want to die, but you know that it wouldn't be right, so you keep living only to die on the inside. Yea, that's what life's like.
*edit: this has nothing to do with my life, it's just my outlook on life in general.