Tumours are a tier 3 symptom. They occur when pathogens induces uncontrolled cell growth, causing malignant neoplasms (cancer) and tumours. This can be fatal.

Trivia

  • Tumours is the only symptom in standard plagues where it doesn't give any severity.
  • Along with Fever, Inflammation, and Diarrhoea, Tumours are one of the four symptoms which can be better understood by scientists during a game. Having Tumours evolved when this happens makes your plague easier to cure. Evolving any of the four symptoms will make your plague easier to cure.

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