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How to adjust door hinges
Examine the top corner of your door to see if it's catching on the frame.
Over time, the hinges on a door can loosen and cause the door to sag downward. When this happens, the top corner of the door catches on the door frame and prevents the door from closing properly.
If the top corner of your door is catching on the frame, you'll need to adjust the hinges. Another way you can tell if your door is hanging downward is by looking at the gap between the top of the door and the frame.