The Hypergraphia reference article from the English Wikipedia on 24-Apr-2004
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Hypergraphia

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Hypergraphia is the uncontrollable urge to write.

It is not a formally-recognized disorder, although it has been embraced by neurologist Alice Weaver Flaherty in her book The Midnight Disease: The Drive to Write, Writer's Block, and the Creative Brain.

Many weblog authors and diarists, as well as some professional authors, have been accused of suffering from the affliction.