You have not provided much information. Here are a few possibilities to
check in Word, e.g., Word 2000 assuming that the document was created in
Word:
--Does this happen only in this document? If so, do you know how the
document was created? In Word? Did you create this document? In Word?
--Are you sure that the space you see is actually a header rather than some
sort of empty text box? Or graphic box?
--Check for header height in Page Setup to see if the setting is reasonable.
(You did not mention footers)
--Is the header the same for all pages or just page 1? Does Page Setup call
for "Different first page?"
--Header: Go into the header and see what's there. You said there were no
obvious spaces and hard returns, but what about other possibilities? Is
there a font setting for a huge font--this is usually accompanied by a
correspondingly huge line size. Is there a setting for Paragraph/Line
Spacing? A huge spacing could cause this. What style(s) is(are) used in
the header and what are the settings for font, line spacing, paragraphs,
etc? Generally, if you create a header in Word the style of the header is
Header.
--The document might be corrupted.
Hope this may be of some help
