Compulsive hoarding
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Compulsive hoarding (or pathological hoarding) is a term which is used to describe extreme hoarding behaviour in humans. It involves the collection or failure to discard large numbers of objects even when their storage causes significant clutter and impairment to basic living activities such as moving around the house, cooking, cleaning or sleeping. Hoarding rubbish may be referred to as syllogomania.

While there is no definition of compulsive hoarding in accepted diagnostic criteria (such as the current DSM), Frost and Hartl (1996) provide the following defining features:[1]

the acquisition of, and failure to discard, a large number of possessions that appear to be useless or of limited value
living spaces sufficiently cluttered so as to preclude activities for which those spaces were designed
significant distress or impairment in functioning caused by the hoarding