Hi, Thank you for your question. If he has continuous headache, possible causes may be shunt is either under-draining or over-draining. His doctor can assess this with a lumbar puncture and measures the fluid pressure. He or She may make some adjustment of the shunt to allow it to drain more and can monitor if the headache improve. Another possibility could be shunt is over-draining, that may lead to low CSF pressure that can also lead to headache. This may improve when the person lies down and gets worse when the person sits or stands. Other possibility could be migraine or cluster headache since these types of headaches are quite common in females. Even then if he suffers continuous headache, please arrange an appointment with a neurologist right away who will evaluate the further underlying disorders here that may be the main reasons of his headaches and can suggest her appropriate treatment. Hope this information proves helpful to you.
This is perfectly normal if he has already had a V P shunt. He might need another so you need to talk to your doctor about hydrocephalus.