Paranoia

Paranoia was a mental disorder in which an individual believed themselves to be a victim of persecution. It was sometimes also used to denote excessive suspicion of others. The Seventh Doctor once defined paranoia as "a heightened appreciation of how badly the universe wants to get you." (PROSE: Original Sin)

Some substances were capable of causing paranoia. These included the drugs skoob (PROSE: Mean Streets) and Sarg (PROSE: Deadly Reunion), and exposure to icarons. (PROSE: Original Sin) Paranoia was a symptom of robophobia. (TV: The Robots of Death)

Harry Randall suffered from paranoia. (AUDIO: The Magic Mousetrap)

Paranoia thrived on the Internet in the early 21st century, which helped give rise to the Church of the Grey. (PROSE: Where Angels Fear)

In 2006, the crash of an alien spaceship in London and the British government not responding led to paranoia sweeping the United Kingdom, with at least three reports of people being falsely identified as aliens and assaulted. (TV: Aliens of London)

Miss Kizlet's tablet was capable of changing one's level of paranoia. (TV: The Bells of Saint John)

In 2069, the Shift introduced the concept of paranoia to Marie, who turned her weapons systems against herself. (PROSE: Alien Bodies)

On Frontios, Range accused Plantagenet of paranoia when he suspected the Fifth Doctor being responsible for the meteorites bombarding the colony. (TV: Frontios)