Noun
A
long-term
respiratory
condition
,
in
which
the
airways
may
unexpectedly
and
suddenly
narrow
,
often
in
response
to
an
allergen
,
cold
air
,
exercise
,
or
emotional
stress
.
Symptoms
include
wheezing
,
shortness
of
breath
,
chest
tightness
,
and
coughing
.