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When an older adult starts to walk unsteadily, forget things, and lose bladder control, families often fear Alzheimer’s or Parkinson’s. But sometimes the real cause is different, and it can be treated. Normal pressure hydrocephalus, or NPH, is a buildup of fluid in the brain that can look like dementia yet often improves with surgery. Knowing about this condition matters, because it is one of the few causes of memory loss and falls that can actually be reversed when caught early.

This guide explains what NPH is, its warning signs, how it is diagnosed, and how it is treated. If you have noticed these changes in a parent or spouse, you do not have to drag them to a busy clinic to start getting answers. With Doctor2me, you can have a doctor come to the home for a same-day visit, which is calmer and safer for someone who is already unsteady on their feet.

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What Normal Pressure Hydrocephalus Is

Your brain floats in a clear liquid called cerebrospinal fluid. Normally this fluid is made, flows around the brain, and is absorbed in a steady cycle. In NPH, the fluid builds up in the brain’s open spaces, called ventricles, and makes them larger. This extra fluid presses on nearby brain tissue.

Why It Is Called Normal Pressure Hydrocephalus

The buildup happens so slowly that the brain adjusts, so the fluid pressure inside the head usually stays in the normal range, notes MedlinePlus. That is why the condition is called normal pressure hydrocephalus. The pressure reading looks normal, but the enlarged ventricles still damage how the brain works. This is what makes NPH easy to miss.

Who Gets This NPH Condition

This NPH condition mostly affects older adults. Mayo Clinic notes that hydrocephalus is more common in adults age 60 and older. It is not rare: Yale Medicine estimates that more than 700,000 people in the United States have NPH, yet fewer than 20% are ever diagnosed. It may account for up to 5% of all dementia cases.

NPH Symptoms: The Classic Triad

NPH symptoms tend to show up as three main problems, which doctors call the classic triad. According to Penn Medicine, these usually develop slowly over three to six months. Not everyone has all three.

Trouble Walking

Walking problems are often the first and most obvious sign. Steps become short, slow, and shuffling, the feet may feel stuck to the floor, and balance gets worse. This is what raises the risk of dangerous falls. If a loved one has started stumbling, a simple fall risk check can help spot the danger early, and it is worth knowing what to do in the first minutes after a fall.

Memory and Thinking Changes

The second sign is cognitive decline. People become forgetful, slow to think, less able to plan or organize, and sometimes apathetic. Because NPH is one of the many diseases that cause memory loss, it is often mistaken for Alzheimer’s. It can also be confused with the memory changes that follow a stroke. The key difference is that NPH is treatable.

Loss of Bladder Control

The third sign is loss of bladder control. It usually appears later, starting with a strong, sudden need to urinate and progressing to leaks or full incontinence. When walking, memory, and bladder problems appear together in an older adult, NPH should be considered.

What Causes NPH

In about half of cases, there is no known cause. Yale Medicine notes that this idiopathic type usually appears in people aged 60 and older. The rest are called secondary NPH and follow another event that disrupts fluid flow.

The cause of NPH in secondary cases can include bleeding in the brain such as a subarachnoid hemorrhage, a serious head injury, a brain infection like meningitis, a brain tumor, or a complication from brain surgery, explains the National Institute of Neurological Disorders and Stroke. Some of these events are linked to high blood pressure, a common cause of brain bleeds, but many people develop NPH with none of these triggers at all. Older age is the main risk factor.

How NPH Is Diagnosed

Because NPH looks like other conditions, careful testing is important. Diagnosis usually combines a few steps.

A neurological exam and a close look at how the person walks.
Brain imaging with an MRI or CT scan, which shows the enlarged ventricles. MRI is often the first test.
A spinal tap, sometimes called the tap test. Doctors remove some spinal fluid and then re-check the person’s walking. Yale Medicine notes that about 30 milliliters of fluid, roughly two tablespoons, is removed and a timed walk is compared before and after.

If walking clearly improves after the tap, the person is much more likely to benefit from surgery. When the tap test is unclear, a longer drainage trial in the hospital may be used.

NPH Treatment and the NPH Shunt

There are no medicines that fix NPH. The main NPH treatment is surgery to place a shunt, a thin tube with a valve that drains the extra fluid away from the brain.

How the NPH Shunt Works

The most common device is a ventriculoperitoneal shunt. It carries fluid from a ventricle in the brain, under the skin, down to the belly, where the body absorbs it, explains the American Association of Neurological Surgeons. The shunt usually stays in place for life and is checked from time to time. Modern valves can be adjusted to control how much fluid drains.

Living With a Shunt at Home

After surgery, recovery and safety at home matter a great deal. Steady support with memory care and coordination can make a real difference, and specialists like Dementia Partner help families with dementia assessments and care planning when thinking changes are part of the picture. To lower the risk of falls while balance recovers, home-safety experts such as Call Before You Fall provide free home safety assessments and grab bars, ramps, and other equipment matched to the person’s needs.

NPH Prognosis: What to Expect

The outlook is often hopeful, especially with early treatment. Yale Medicine reports that symptoms improve in roughly 50% to 90% of patients who receive a shunt, and walking is the symptom most likely to get better.

The NPH prognosis depends heavily on timing. AANS notes that in some cases dementia symptoms can even be reversed by a shunt, and the earlier NPH is diagnosed, the better the chance of success. Once dementia has been present for a long time, those symptoms may not fully recover. Left untreated, NPH tends to get worse over time, which is why acting early is so important.

When to See a Doctor

See a doctor if an older adult develops new or worsening trouble walking, memory or thinking changes, or loss of bladder control. More than one condition can cause these signs, so a timely exam matters. Because NPH is one of the few treatable causes of these problems, it is worth checking rather than assuming the worst. A home visit is an easy, low-stress way to begin, and Doctor2me makes it simple to be seen the same day without a trip to a crowded waiting room.

Why NPH Is Often Missed or Mistaken

One of the biggest challenges with NPH is that it hides in plain sight. Its symptoms overlap with the most common problems of aging, so families and even some clinicians assume the changes are just a normal part of getting older or the start of an untreatable dementia.

Look-Alike Conditions

The slow, shuffling walk of NPH can look like Parkinson’s disease. The forgetfulness and slowed thinking can look like Alzheimer’s. The bladder urgency can be blamed on a prostate problem or a simple overactive bladder. When each symptom is treated on its own, the underlying fluid problem in the brain can go unnoticed for years. Yale Medicine notes that fewer than 20% of people who have NPH are ever correctly diagnosed.

Why the Difference Matters

This gap is important because NPH stands apart from most look-alike conditions in one key way: it can be treated, and sometimes reversed. A person who is written off as having early dementia might instead have a fluid problem that a shunt can ease. That is why any older adult with the classic triad of walking, memory, and bladder changes deserves a closer look with brain imaging and a spinal-tap test before anyone assumes nothing can be done.

Frequently Asked Questions

What are the symptoms of normal pressure hydrocephalus?

NPH has three hallmark symptoms: trouble walking (unsteady, shuffling, feet that feel stuck, and falls), memory and thinking decline, and loss of bladder control. Walking problems usually come first and bladder problems tend to appear later. Many people have only one or two of the three signs.

What is an NPH shunt and how does it work?

An NPH shunt is a thin tube with a valve, most often a ventriculoperitoneal shunt, that drains extra fluid from a brain ventricle down to the belly, where the body absorbs it. This lowers the fluid buildup so symptoms can improve. The shunt usually stays in place for life and is checked periodically.

What causes NPH?

In about half of cases the cause is unknown and usually appears after age 60. The rest, called secondary NPH, follow bleeding in the brain, a head injury, an infection like meningitis, a brain tumor, or prior brain surgery. Older age is the main risk factor.

What is the prognosis for normal pressure hydrocephalus?

With a shunt, symptoms improve in roughly 50% to 90% of patients, and walking is the most likely to get better. Outcomes are best when NPH is found and treated early. Without treatment, symptoms tend to get worse over time.

How is NPH different from Alzheimer’s or dementia?

NPH is caused by treatable fluid buildup and can often improve with shunt surgery, unlike most degenerative dementias. On a brain scan, NPH shows enlarged fluid spaces without the widespread brain shrinkage seen in Alzheimer’s. A neurologist uses imaging and a spinal-tap test to tell them apart.

How is NPH treated?

There are no medicines for NPH; the standard treatment is surgery to place a shunt that drains the extra fluid. Before surgery, doctors often do a tap test, removing some spinal fluid to see if walking improves and predict who will benefit. Treating NPH early gives the best chance of improvement.

A Treatable Cause of Memory Loss and Falls: What Is NPH?