How can cancer be found if most cancers don't even have any symptoms?

Anonymous
I'm really worried I have it, reason being, I have a high white blood cell count, with no other sign of infection or symptoms. meaning, my body could be fighting something that is hiding itself. but I have no symptoms and there are over 200 different types of cancer how on earth could you even test for it?
How can cancer be found if most cancers don't even have any symptoms?
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