Mania. From Ancient Greek μανία, mania, madness. Violent derangement of mind, insanity, insane passion affecting one or many people.
Derived or related words: maniac, manic.
The word mania is used in a lot of words as a suffix. A few examples are:
Megalomania. From Greek μεγαλομανία, megalomania, from μεγάλος, megalos, big + μανία, mania, madness. A psycho-pathological condition characterized by delusional fantasies of wealth, power, or omnipotence.
Kleptomania. From Greek κλεπτομανία, kleptomania, from κλέπτω, klepto, steal + μανία, mania, madness. Obsession of stealing.
Egomania. From Greek εγωμανία, egomania, from ego + μανία, mania, madness. Obsession with someone's own (supposed) importance.
Nymphomania. From Ancient Greek νυμφομανία, nymphomania, from νύμφη, nymph (in Greek mythology a nymph was a minor deity represented as beautiful maiden) + μανία, mania, madness. A neurotic condition in women in which the symptoms are a compulsion to have sexual intercourse with as many men as possible and an inability to have lasting relationships with them.