Hello.Your child has VP shunt by hydrocephalus
(increase Pressure intracerebral).Faced with a headache in a patient as his son,always the first cause to rule out is increased brain pressure, but it is important say you that your child may also have headaches
by other frequents pathologies in pediatric patients for example migraine
or tension headache
A headache secondary to increased brain pressure, symptoms are different than other types of headache.When Secondary headache by increased brain pressure is suspected ,CT Scan
Trust in your doctors if they say you that the cause of headache
is not VP-shunt /increased intracerebral pressure.
I wish your son good health.
(In case the answer would have been useful please indicate this)