Normal pressure hydrocephalus (NPH) is a buildup of excess cerebrospinal fluid in the brain's fluid-filled chambers, or ventricles, that can cause dementia-like symptoms. It classically produces a triad of walking trouble, thinking problems, and bladder control issues, with gait changes usually showing up first, according to the Alzheimer's Association and the NINDS disease overview reprinted by BrainFacts. For caregivers, NPH matters because it is one of the few causes of dementia-like decline that can sometimes be reversed with treatment. Recognizing the early signs, understanding what a diagnosis involves, and knowing what daily care looks like before and after treatment can change how much function a person regains.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What Does NPH Look Like Day to Day?
- Who Gets NPH, and Why Does It Happen?
- How Is NPH Diagnosed?
- What Does Treatment Involve, and What Should Caregivers Expect?
- Safety and Daily Care Before and After Treatment
- Frequently Asked Questions
What Does NPH Look Like Day to Day?
The earliest and most noticeable sign is usually a change in walking. People with NPH often shuffle, take short steps, widen their stance, or seem to have trouble lifting their feet, as if walking on a sticky floor. This gait change typically appears before the other two classic symptoms, according to the Hydrocephalus Association's NPH booklet. Thinking changes in NPH have a different character than Alzheimer's disease.
The Alzheimer's Association describes NPH-related cognitive symptoms as overall slowed thinking, apathy, difficulty planning, trouble concentrating, and personality change, with only mild memory loss, rather than the prominent short-term memory loss seen in Alzheimer's (Alzheimer's Association). A caregiver may notice the person has become withdrawn or struggles to start tasks, rather than forgetting recent conversations. Bladder control problems tend to show up later than the walking and thinking changes. A diagnosis does not require all three symptoms to be present at once, so a person showing only gait changes early on can still have NPH (Hydrocephalus Association).
Who Gets NPH, and Why Does It Happen?
NPH mostly affects older adults. In many cases there is no identifiable cause, known as idiopathic NPH. In other cases it follows a specific event, such as a subarachnoid hemorrhage, head trauma, a brain infection, a tumor, or previous brain surgery, which is called secondary NPH, according to NINDS.
NPH is not common, but it is clinically significant: estimates suggest it accounts for up to about 5 to 6 percent of all dementia cases, according to the American Academy of Family Physicians. That makes it a small slice of the overall dementia population, but one worth ruling out because, unlike most dementias, it can sometimes be treated. If a family member has had a brain bleed, head injury, or brain surgery in the past and later develops gait or thinking changes, that history is worth raising with a doctor directly, since it points toward secondary NPH rather than a degenerative dementia.
How Is NPH Diagnosed?
Diagnosis starts with brain imaging, either an MRI or CT scan, looking for enlarged ventricles alongside brain tissue that otherwise looks preserved. This pattern is a hallmark finding that distinguishes NPH from the diffuse brain shrinkage seen in Alzheimer's disease, as described in a Cleveland Clinic Journal of Medicine review.
Many centers follow imaging with a large-volume lumbar puncture, often called a tap test, in which roughly 40 to 50 mL of cerebrospinal fluid is removed. Doctors then watch for temporary improvement in gait and thinking, which helps predict whether a shunt will help (Cleveland Clinic Journal of Medicine; AJNR). A caregiver can expect this to involve a short hospital or clinic visit, with the care team assessing walking speed and mental clarity before and after the fluid is drawn.
- Imaging (MRI or CT) showing enlarged ventricles with preserved surrounding brain tissue
- A tap test removing 40–50 mL of cerebrospinal fluid, watching for temporary improvement
- Clinical assessment of gait, cognition, and bladder symptoms before and after the tap test
What Does Treatment Involve, and What Should Caregivers Expect?
The main treatment for NPH is surgical placement of a ventriculoperitoneal (VP) shunt, a thin tube that drains excess cerebrospinal fluid from the brain's ventricles to another part of the body where it can be absorbed. This is a real surgical procedure, not a medication or lifestyle change. Response to shunting is variable. Based on history and imaging alone, the positive predictive value of improvement after shunt surgery ranges from under 50 percent to about 61 percent, according to the Cleveland Clinic Journal of Medicine and a NICE evidence overview.
That means some patients who have surgery do not see meaningful improvement, even when the tap test looked promising. Without treatment, NPH symptoms usually get worse over time, though some patients have periods where symptoms fluctuate rather than steadily decline. Earlier diagnosis and treatment are linked to better chances of meaningful recovery, according to NINDS. This is why caregivers who notice gait changes alongside personality shifts or concentration problems should raise NPH as a possibility with a doctor rather than assuming it is ordinary aging or an irreversible dementia.
Safety and Daily Care Before and After Treatment
Because NPH's defining symptom is a gait disturbance, fall risk is the most immediate safety concern for caregivers. A person who shuffles, has a wide stance, or struggles to lift their feet is more likely to trip on rugs, thresholds, stairs, or cluttered walkways.
Caregiver burden can ease measurably when a patient responds well to treatment. A 2011 controlled study of shunted NPH patients found that alongside gains in patients' daily living activities, caregivers reported reduced distress after surgery, according to research indexed through Frontiers in Surgery. That finding reflects what many caregivers experience directly: when walking and thinking improve, the day-to-day work of supervision and physical assistance often becomes lighter too.
- Clear walking paths of loose rugs, cords, and clutter
- Install grab bars near toilets and in showers, since bladder urgency can prompt rushed, unsteady movement
- Keep frequently used items within easy reach to reduce unnecessary trips across the room
- Watch for sudden changes in alertness or new confusion, and report them to the care team promptly
- After shunt surgery, monitor for signs of shunt malfunction or infection, such as worsening headache, fever, or a return of prior symptoms, and contact the surgical team right away
Frequently Asked Questions
Does every person with NPH develop all three classic symptoms?
No. Diagnosis does not require all three, and bladder problems often appear later than gait and thinking changes, according to the Hydrocephalus Association.
How is NPH different from Alzheimer's disease in daily behavior?
NPH typically causes slowed thinking, apathy, and planning difficulty with only mild memory loss, while Alzheimer's more often involves prominent short-term memory loss, per the Alzheimer's Association.
Is shunt surgery guaranteed to help?
No. Based on history and imaging alone, the predictive value of improvement ranges from under 50 percent to about 61 percent, so outcomes vary by patient.
