Hydrocephalus in Adults: Symptoms, Causes and Treatment Options

By Haris Bin Tahir
Father of a hydrocephalus survivor. Independent researcher. Not a doctor.
Founder, Brain Care Path · braincarepath.com

Key Takeaways

• Hydrocephalus in adults is often different from the childhood condition — normal pressure hydrocephalus (NPH) is a distinct, age-related form
• NPH classically presents with a triad of symptoms: gait difficulty, cognitive decline, and bladder problems
• Because these symptoms overlap with other age-related conditions, NPH is frequently misdiagnosed or missed entirely
• Shunt surgery can meaningfully improve symptoms in adults, particularly when the gait disturbance is caught and treated early
• Adults who had childhood-onset hydrocephalus can also experience new symptoms decades later, which is a different clinical picture from NPH

Most of what gets written and searched about hydrocephalus is about children — for good reason, since it is best known as a condition of infancy and early childhood. But hydrocephalus also affects adults, sometimes appearing decades into a person’s life with no prior history, and sometimes resurfacing in adults who had shunts placed as children. Families researching a parent or grandparent’s new diagnosis are often surprised at how little exists to explain this specific version of the condition.

This article covers hydrocephalus in adults specifically — what causes it, how it differs from the pediatric condition, why it is so often missed, and what treatment looks like.

Normal Pressure Hydrocephalus: The Most Common Adult Form

The most common form of hydrocephalus diagnosed later in life is normal pressure hydrocephalus, or NPH. It occurs when cerebrospinal fluid builds up in the brain’s ventricles, but — unlike the classic pediatric picture — the fluid pressure measured on testing often falls within a “normal” range, which is exactly why it can be so easy to miss. NPH typically affects older adults, most often those over 60.

Recognizing the Symptoms: The Classic Triad

NPH is classically described through three symptoms appearing together, sometimes called “wet, wobbly, and wacky” in informal clinical shorthand:

• Gait difficulty: a slow, shuffling, wide-based walk, often the earliest and most noticeable symptom
• Cognitive changes: slowed thinking, memory difficulty, and reduced attention — often mistaken for early dementia
• Bladder problems: urgency or incontinence, frequently the last symptom to appear

Because each of these symptoms, in isolation, is common in aging and in other conditions, NPH is one of the more frequently misdiagnosed treatable causes of what looks like age-related decline — misattributed to normal aging, Parkinson’s disease, or dementia far more often than it should be.

Getting an Accurate Diagnosis

Diagnosis typically involves brain imaging (CT or MRI) showing enlarged ventricles, alongside a clinical evaluation of the gait, cognitive, and bladder symptoms. A common confirmatory step is a “large-volume lumbar puncture” or extended lumbar drain trial — temporarily draining cerebrospinal fluid to see whether gait and cognition improve, which helps predict how well a person is likely to respond to a permanent shunt.

Shunt Treatment and Recovery in Adults

A ventriculoperitoneal (VP) shunt — the same general device used in pediatric hydrocephalus — is the standard treatment for NPH, diverting excess cerebrospinal fluid away from the brain. Research following patients after shunt surgery for NPH shows gait symptoms often respond best and earliest, with cognitive and bladder symptoms improving more variably. Long-term outcome studies also show that comorbid health conditions, rather than NPH itself, are usually the larger factor in a patient’s overall prognosis after treatment.

Adults who had hydrocephalus and a shunt placed in childhood are a separate group worth mentioning: shunts placed decades earlier can develop new problems in adulthood — blockages, infections, or the need for revision — sometimes presenting with subtler symptoms than the dramatic pressure signs seen in infancy. Anyone with a childhood shunt history who develops new headaches, vision changes, or cognitive symptoms as an adult should raise this history explicitly with their doctor, since it may not be the first explanation considered.

What This Means for Your Family

If a parent or older family member is showing a combination of gait changes, memory difficulty, and bladder symptoms, it is worth raising NPH by name with their doctor — particularly because, unlike many causes of cognitive decline in older adults, it is genuinely treatable. Early recognition tends to be associated with better outcomes after shunt surgery, which makes this one of the more actionable conversations a family can have.

Questions to Ask the Doctor

• Could normal pressure hydrocephalus explain these symptoms, and should we pursue imaging to check?
• If NPH is suspected, would a lumbar drain trial help predict how well shunt surgery might work?
• What does recovery and follow-up typically look like after shunt placement in an older adult?
• If there is a childhood hydrocephalus history, could this be a late complication rather than a new condition?

Frequently Asked Questions About Hydrocephalus in Adults

Is normal pressure hydrocephalus the same condition as childhood hydrocephalus?

They are related but distinct. Both involve excess cerebrospinal fluid in the brain’s ventricles, but NPH is typically age-related and presents very differently — through gait, cognitive, and bladder symptoms rather than the head enlargement and pressure signs seen in infants.

Can NPH be mistaken for dementia?

Yes, this is one of the most important reasons NPH awareness matters. Unlike most causes of dementia, NPH is potentially treatable with shunt surgery, which is why ruling it out is a meaningful step in evaluating unexplained cognitive decline in older adults.

How successful is shunt surgery for adults with NPH?

Many patients see meaningful improvement, particularly in gait, though outcomes vary by individual and by how early treatment begins. A lumbar drain trial before surgery helps doctors predict, in advance, how likely a given patient is to benefit.

Hydrocephalus does not end with childhood, and it does not only begin there either. For older adults showing the classic triad of symptoms, and for adults carrying a childhood shunt into later life, awareness of this adult form of the condition can be the difference between years of unexplained decline and a genuinely treatable diagnosis.

This article is for informational purposes only and does not constitute medical advice. Speak with a neurologist or neurosurgeon about any suspected hydrocephalus symptoms. Read our full disclaimer: braincarepath.com/disclaimer/

Bibliography

1. Long-term outcomes after shunt surgery in older patients with idiopathic normal pressure hydrocephalus. Available at PubMed.
2. Charlson comorbidity index applied to shunted idiopathic normal pressure hydrocephalus. Scientific Reports. Available at nature.com.
3. Adult outcome of pediatric hydrocephalus. Available at PMC.

Frequently Asked Questions About Adult Hydrocephalus

What is normal pressure hydrocephalus?

Normal pressure hydrocephalus (NPH) is a build-up of cerebrospinal fluid in the brain of older adults, where pressure readings remain near normal. It causes a classic triad of walking difficulty, memory problems and urinary incontinence, and it is one of the few treatable causes of dementia-like symptoms.

What are the first signs of NPH?

Walking usually changes first. The gait becomes slow, wide-based and shuffling, as though the feet are stuck to the floor. Memory and concentration problems follow, and bladder urgency or incontinence typically appears last.

Is normal pressure hydrocephalus often misdiagnosed?

Yes. Because the symptoms overlap with Alzheimer’s and Parkinson’s disease, NPH is frequently missed. The Hydrocephalus Association and Alzheimer’s Association note that a large majority of cases go unrecognised or untreated, despite NPH being potentially reversible with a shunt.

Can a shunt help normal pressure hydrocephalus?

Often yes, particularly when walking difficulty is the dominant symptom and appeared first. Many people improve after shunt surgery. A lumbar drain trial is commonly performed beforehand, because temporary improvement predicts a better response to a permanent shunt.