Hay Fever
 
Screen 1 of 2
Hay fever
 
is
 
an
allergy.
People
 
who
have
 
it
 
are
allergic to
pollen.
Pollen
 
is
 
a
type
 
of
fine
powder
which
 
is
released.
 
 
 
by
lots of
different
plants
 
and
trees.