Umbridge-itis

Umbridge-itis is an illness created by many Hogwarts students in 1995. In retaliation of the new Headmistress, Dolores Umbridge's tyrannical rule, the students used the Skiving Snackbox sold by Fred and George Weasley to forge illnesses, such as fainting, vomiting, developing dangerous fevers, or spurting blood from both nostrils.

Despite Umbridge's efforts to trace down the source, the students stubbornly told her they were suffering from "Umbridge-itis". Taking it as an insult, she put four successive classes in detention. But after she failed to discover their secrets, the headmistress was forced to allow the students to leave in droves.

Known sufferers

 * Many Hogwarts students

Appearances

 * Harry Potter and the Order of the Phoenix