Cancer
Cancer was a disease in which s divided uncontrollably. It was one of the deadliest diseases on Earth until scientist Pyong Ko discovered the genetic sequence for inhibiting the growth of cancer cells. ()

In 2151, Bernadette Fuller, a colonist of the Terra Nova colony was diagnosed with lung cancer, though it was easily treatable with 's medical equipment. Doctor Phlox administered cytolytic injections to Nadet and cured her. ()

Upon transporters being approved for transporting biomatter, rumors abounded that its use  could cause brain cancer, psychosis or sleep disorders in its users. ()

Cancer can be found in the form of a tumorous growth. Ptera, a Vhnori, had a cancerous tumor on her brain stem in 2371 until it was removed by The Doctor on the . ()

Entities seen as evil or undermining were also referred to as cancers. In a 2268 , the Ekosian Melakon referred to the Zeons as a cancer which was eating away at their state. ()

In a 2364 captain's log, Jean-Luc Picard described the infiltration of parasitic beings into Starfleet Command as "a cancer growing within the ranks of Starfleet." ()

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Medical conditions