A: Compulsive hoarding syndrome is a behavioral disorder characterized by three main features: having severe anxiety that prevents throwing out seemingly worthless items, being prone to acquiring things, and having excessive clutter in homes or workspaces. The disorder may affect as many as two million Americans, according to experts.

Hoarding typically becomes a problem when there is so much saved that it interferes with someone’s mobility and ability to function on a daily basis. Hoarding also can be a danger for both the hoarder and others who live or work near that individual if great amounts of flammable items are stored in a small space.

Although hoarders generally can’t see the negative side of their behavior, you may want to try to talk to your neighbor about having his apartment cleared out. If that fails, contact the authorities -- an adult protective service agency in your county or city of residence if you’re dealing with a vulnerable adult -- or your local Department of Housing and Community Affairs if the person appears to function normally in all ways other than exhibiting hoarding behavior. Email the JCA Senior HelpLine or call (703) 425-0999 or (301) 255-4200 – for contact information specific to your locale.

If you have a credible referral, the professional you contact should make every effort to assist your neighbor.