Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for a person with hydrocephalus or a shunt who:
These signs can indicate rapidly rising pressure or another neurological emergency.
Seek urgent same-day medical assessment for worsening headache, repeated vomiting, unusual sleepiness, new balance problems, vision changes, or a return of previous hydrocephalus symptoms.
With a shunt, fever, redness, swelling, tenderness, or fluid leaking along the device may suggest infection.
A baby needs prompt assessment for a firm bulging soft spot while calm, poor feeding, repeated vomiting, unusual sleepiness, downward-looking eyes, or rapidly increasing head size.
Arrange routine follow-up for gradual changes in walking, memory, bladder control, school progress, development, or recurring mild headaches.
These changes are not always caused by hydrocephalus, but they should be reviewed rather than assumed to be part of ageing or the existing condition.
Every sign above is quoted from the sofidex article on Hydrocephalus. If you are not sure, err upward — it is always reasonable to be checked.