I understand that cancer is uncontrolled reproduction of cells but why is that so harmful? How do extra cells make is so sick?
In: Biology
Cancers also [metastasize](https://www.cancer.gov/publications/dictionaries/cancer-terms/def/metastasis). They start in one place, circulate via blood or other systems, and now your entire body is filled with parasite called cancer.
(I am **not** a doctor.)
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