Cancer is of the killer diseases in our world. We have summarized the causes of cancer which most of it can be prevented. As we all know, cancer should be defeated and prevent it. Cancer already killed millions of people in these past few years. We don’t want to add another to that. We are aware that cancer is very as traitors as it were, so for you to prevent it you should know the cause of it. Let our cause to be known to everyone and make a difference so cancer will be defeated forever. Most of these causes should be prevented so no one will suffer from the dangerous cancer.