The bane of multicellularity.
A cool thought about cancer expressed at Power, Sex, Suicide by Nick Lane (2006) is that cancer it is the direct product of natural selection gone wrong!
Cancer cells are obviously selected against anti-cancer mechanism, which when they manage to evade, they reproduce uncontrollably, gaining more and more momentum.
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Disease is a pathological condition of a bodily part, an organ, or system resulting from various causes, including infection, genetic defects, environmental factors, or lifestyle choices, and is characterized by an identifiable group of signs or symptoms. Diseases can affect the normal functioning of the body and can be acute (short-term and severe) or chronic (long-term and persistent).