mania

Mania is an extreme interest, desire, or craze. If you dye your dog's fur to match the colors of your favorite football team, you might be suffering from sportsmania.

Mania has for centuries been associated with “madness” or “mental derangement.” It's still used in the mental health fields to mean the excitable, overactive phase of bipolar disorder or, as a suffix, to describe a compulsion, such as kleptomania (to steal) or pyromania (to set fires). More generally, it might be used as a suffix to describe enthusiasm, as in Beatlemania (The Beatles) or Pottermania (Harry Potter).

Definitions of mania
  1. noun
    an irrational but irresistible motive for a belief or action
    synonyms: cacoethes, passion
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    types:
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    agromania
    an intense desire to be alone or out in the open
    alcoholism, dipsomania, potomania
    an intense persistent desire to drink alcoholic beverages to excess
    egomania
    an intense and irresistible love for yourself and concern for your own needs
    kleptomania
    an irresistible impulse to steal in the absence of any economic motive
    logomania, logorrhea
    pathologically excessive (and often incoherent) talking
    monomania, possession
    a mania restricted to one thing or idea
    necromania, necrophilia, necrophilism
    an irresistible sexual attraction to dead bodies
    phaneromania
    an irresistible desire to pick at superficial body parts (as in obsessive nail-biting)
    pyromania
    an uncontrollable desire to set fire to things
    trichotillomania
    an irresistible urge to pull out your own hair
    type of:
    irrational motive
    a motivation that is inconsistent with reason or logic
  2. noun
    a mood disorder; an affective disorder in which the victim tends to respond excessively and sometimes violently
    synonyms: manic disorder
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    types:
    craze, delirium, frenzy, fury, hysteria
    state of violent mental agitation
    nympholepsy
    a frenzy of emotion; as for something unattainable
    epidemic hysertia, mass hysteria
    a condition in which a large group of people exhibit the same state of violent mental agitation
    type of:
    affective disorder, emotional disorder, emotional disturbance, major affective disorder
    any mental disorder not caused by detectable organic abnormalities of the brain and in which a major disturbance of emotions is predominant
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