How does cancer occur in the human body?

There are many causes of cancer, ranging from your diet, to where you live, anything can cause it.
It just randomly screws up the cells, and then they start making cells that aren't natural, and that your body can't use.

Mutations in genes occur, in multiple ways, and from there cells begin to replicate at an extreme rate but these cells are not necessarily used by the body which causes growths and when an area gets blocked by these growths, the blood pressure builds and eventually knocks cells off and spreads the cancer.

skin cancer is when your body stops producing white blood cells, i think

In the cell cycle, something called G₀ comes into play. When a cell's DNA does not replicate properly and cannot function well, the cell enters G₀... which is basically cell suicide.

When the cell doesn't enter G₀, it begins to multiply quickly from mutations, producing bad cells. This can lead to a tumor.

Why the cell doesn't go into G₀ I believe is unknown. As far as I know, that's the key for cancer research.

	Peep Bunnies -  1248 pts -  (2 years ago)
	That's said "G Zero" by the way. Sometimes the character doesn't work. G subscript 0

	bobbonew -  2656 pts -  (2 years ago)
	Hey peeps. You can do [sub] and [sup] for subscript and superscript. For example: G0 I've edited your answer so you can see the usage. We'll be publishing these methods soon.

	Peep Bunnies -  1248 pts -  (2 years ago)
	Yaaay! Thank you. =] I had just copied and pasted the character and I don't think it worked to well.