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In terms of cause and effect, a root cause is the cause of symptoms and a symptom stemming from a root cause is the effect of the root cause. There is no entity disease involved in cause and effect.
Seventh, because the immune system is weak it cannot kill enough cancer cells and the cancer cells grow out of control. Thus, in summary, the root cause of cancer is microbes and parasites that are in the organs or colon (or bloodstream), which weakens the immune system. However, other things can cause cancer.