Bibliomania

Engraving titled The Bibliomaniac from Navis Stultifera (The Ship of Fools) by Sebastian Brandt, 1497.

Bibliomania can be a symptom of obsessive–compulsive disorder which involves the collecting or even hoarding of books to the point where social relations or health are damaged.

Bibliomania is not to be confused with bibliophilia, which is the (psychologically healthy) love of books, and as such is not considered a clinical psychological disorder.