Gueses:
You have a setting for "different first page" and multiple section breaks.
Possibly one of your headers is set for vertical alignment "center".
--
Charles Kenyon

Word New User FAQ & Web Directory: http://addbalance.com/word

Intermediate User's Guide to Microsoft Word (supplemented version of
Microsoft's Legal Users' Guide) http://addbalance.com/usersguide

See also the MVP FAQ: http://www.mvps.org/word which is awesome!
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"Nancy Margolis" Nancy wrote in message
...
I'm editing a document in Word, and every 20 pages or so, a header is
suddenly 4 inches deep, which is messing up my layout. How do I resize
the
depth of a header, and what is going on that would scatter stuff like this
throughout my document?