But  the  above  order  of  frequency  is  not  that  in  which  the  symptoms  occur
during  an  attack.  The  various  sensory  accompaniments  of  the  headache
usually  occur  first,  then  comes  the  pain,  and  after  the  pain  has  lasted  for  a
time  nausea  occurs,  followed  by  vomiting,  and  this  often  ends  the  attack.
Vasomotor  disturbance  may  be  present  in  some  form  throughout  an  attack
or  may  come  on  only  toward  the  close.  When  sensory  disturbance  is  absent,
the  pain  is  the  first  symptom.
