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Ailment information
Provoked by



Extreme variance from normal behavioral patterns.


Shock Spells (possibly)

Known affected
"Mental that one, I'm telling you."
Ronald Weasley giving his considered view of Hermione Granger.[src]

Insanity, also known as madness, is a general term for certain abnormal behavioural patterns, typically associated with those suffering from mental illness.[1] Those suffering from insanity often cannot interact with normal society, and frequently require long-term treatment in a medical facility such as St. Mungo's Hospital for Magical Maladies and Injuries. Prolonged exposure to certain curses, such as the Cruciatus Curse or the Imperius Curse, may cause this condition. It can also be inflicted by certain types of potions, either temporarily or permanently, such as the Drink of Despair[2] and possibly Essence of Insanity. Listening to Fwooper song for a sufficiently long period can also cause this condition.[3] Shock Spells may be a treatment for this condition.

In his earlier years at Hogwarts School of Witchcraft and Wizardry, Ronald Weasley, particularly in the early stages of their association, often claimed that Hermione Granger was insane because she was clever, read excessively and for pleasure, and retained information which was never of adequate interest for him to notice it.

Starting in the summer of 1995, the Daily Prophet, under pressure from the British Ministry of Magic, ran a smear campaign claiming, among other things, that Harry Potter's assertion that Lord Voldemort had returned was a sign that he had gone insane, which only ended when Voldemort's return was proven following the Battle of the Department of Mysteries.

Peeves made this claim of Remus Lupin with a tune to match. "Lupin! Loony, loony, Lupin!"

Known insane individuals


Notes and references

  1. WP favicon Insanity on Wikipedia
  2. Harry Potter and the Deathly Hallows, Chapter 28 (The Missing Mirror) (Harry comments "Your brother drank a potion that drove him out of his mind.")
  3. 3.0 3.1 Fantastic Beasts and Where to Find Them (real)
  4. Harry Potter and the Goblet of Fire - Chapter 30 (The Pensieve)
  5. 5.0 5.1 Harry Potter and the Goblet of Fire - Chapter 28 (The Madness of Mr. Crouch)

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