While much of hydrocephalus care is routine and ongoing, there are situations that are medical emergencies — when CSF pressure rises dangerously, whether from untreated hydrocephalus or a problem with a shunt or ETV. Knowing these warning signs can be life-saving. This is one of the most important articles in this library to read and remember.
Why hydrocephalus can become an emergency When CSF builds up faster than it can drain — for example, from an acute blockage, a sudden bleed, or a shunt that has stopped working — pressure inside the skull can rise quickly. Because the rigid skull (in children and adults) can't expand, this rising pressure can become dangerous, potentially affecting the brain. Prompt treatment relieves the pressure.
Emergency warning signs in babies and infants. Seek emergency care for:
- A markedly bulging, tense fontanelle (soft spot).
- Persistent or forceful vomiting.
- Extreme sleepiness or difficulty waking.
- A high-pitched cry or extreme irritability.
- Sunsetting eyes (eyes deviated downward).
- Seizures.
- A rapidly enlarging head.
Emergency warning signs in children and adults. Seek emergency care for:
- Severe or rapidly worsening headache.
- Persistent vomiting.
- Increasing drowsiness, confusion, or difficulty waking.
- New vision changes — blurred or double vision, or eyes that deviate.
- Difficulty with balance or walking that's new or worsening.
- Seizures.
- Loss of consciousness.
- A change in alertness or responsiveness.
Special urgency for people with a shunt or ETV If you or your child has a shunt or has had an ETV, the symptoms above can signal that the treatment has failed — a blocked or malfunctioning shunt, an infection, or a closed ETV. Shunt and ETV failures can be emergencies and need urgent evaluation. A useful rule: symptoms that resemble the person's original hydrocephalus symptoms may mean the treatment is no longer working. When in doubt, seek care — it's always better to be checked.
What "seek emergency care" means For these warning signs, go to an emergency department or call emergency services. If the person has a known shunt, tell the medical team about it immediately — they will assess for shunt malfunction or infection, often with imaging and other tests. Bring any information you have about the shunt (type, settings, surgeon).
Don't wait to "see if it passes." With potential hydrocephalus emergencies, timeliness matters. It's far better to be evaluated and reassured than to delay treatment of rising pressure. Trust your instincts — particularly with babies and children, and particularly when someone has a known shunt.
A note on balance Most headaches, vomiting, and tiredness are not emergencies and have ordinary causes. But the specific patterns above — especially severe or worsening symptoms, changes in alertness, or any concerning symptom in someone with a shunt — are the situations where urgent care is warranted. Knowing these signs in advance means you can act quickly and confidently if they ever appear.