Hydrocephalus

Hydrocephalus is a condition in which cerebrospinal fluid builds up inside the brain’s fluid spaces, called ventricles, and can increase pressure or stretch brain tissue. It can affect babies, children, adults and older adults, and it is usually managed by neurology and neurosurgery specialists.

Overview

Hydrocephalus is a medical condition in which too much cerebrospinal fluid, often shortened to CSF, collects in the ventricles of the brain. CSF normally cushions the brain and spinal cord, carries nutrients, and removes waste. It is continuously produced, circulates through the brain and spinal canal, and is absorbed into the bloodstream. Hydrocephalus occurs when this balanced system is interrupted.

The word hydrocephalus is sometimes described as fluid on the brain. The condition may develop before birth, during infancy or childhood, after an illness or injury, or later in adult life. In some people, excess fluid raises pressure inside the skull. In others, particularly some older adults with normal pressure hydrocephalus, pressure may not appear consistently high, but the enlarged ventricles can still affect brain function.

Hydrocephalus is not a single disease with one cause. It is a group of conditions that share the same result: abnormal CSF accumulation. Because the brain and nervous system are involved, assessment is usually performed by neurologists, neurosurgeons, pediatric specialists, radiologists and rehabilitation professionals when needed. With early recognition and careful follow-up, many patients can receive effective treatment and maintain good daily function.

Symptoms

Hydrocephalus symptoms depend on age, how quickly fluid builds up, the underlying cause and whether pressure inside the skull is increased. Some symptoms develop suddenly, while others appear gradually over weeks, months or years. A person’s symptoms may also change over time, especially if hydrocephalus is related to another neurological condition.

In babies, the skull bones have not fully fused, so the head may enlarge as fluid accumulates. Possible signs include a rapidly increasing head size, a bulging or tense soft spot, unusual sleepiness, poor feeding, vomiting, irritability, downward-looking eyes, seizures or delays in development. In older children and adults, symptoms may include headache, nausea, vomiting, blurred or double vision, balance problems, difficulty walking, sleepiness, changes in concentration, poor school or work performance, and personality or behavior changes.

Normal pressure hydrocephalus, more often seen in older adults, commonly affects walking first. A person may develop a slow, shuffling or wide-based gait, feel unsteady, or have difficulty starting to walk. Memory and thinking changes can occur, as well as urinary urgency or loss of bladder control. These symptoms can overlap with other conditions, so medical evaluation is important rather than assuming they are a normal part of aging.

Causes & Risk Factors

Hydrocephalus develops when CSF cannot flow normally, cannot be absorbed properly, or, more rarely, is produced in excess. Obstructive hydrocephalus occurs when a blockage prevents fluid from moving through the ventricles or pathways around the brain. Communicating hydrocephalus occurs when fluid can pass through the ventricles but is not absorbed effectively into the bloodstream. Both patterns can lead to enlargement of the ventricles.

Causes vary by life stage. In babies, hydrocephalus may be associated with congenital brain development differences, genetic conditions, complications related to premature birth, bleeding in or around the brain, or infections during pregnancy. In children and adults, causes may include head injury, brain or spinal tumors, bleeding, meningitis or other infections, complications after surgery, or structural narrowing within CSF pathways. Sometimes no clear cause is found.

Risk factors include premature birth, a history of brain bleeding, infections affecting the brain or its coverings, previous neurosurgery, certain congenital conditions, and disorders that may block CSF pathways. Older adults may develop normal pressure hydrocephalus without an obvious trigger, although it can also follow bleeding, infection, trauma or surgery. Because the cause influences treatment, identifying the reason for hydrocephalus is an important part of care.

Diagnosis

Diagnosis begins with a careful medical history and neurological examination. The doctor asks about symptoms, when they began, whether they are worsening, and any history of birth complications, infections, trauma, tumors or previous surgery. In infants, head circumference is measured and compared with expected growth patterns. In children and adults, the examination may assess walking, balance, eye movements, strength, reflexes, coordination, memory and level of alertness.

Brain imaging is central to diagnosing hydrocephalus. In infants with an open soft spot, cranial ultrasound may help visualize the ventricles. Magnetic resonance imaging, or MRI, provides detailed pictures of the brain, ventricles and CSF pathways. Computed tomography, or CT, can be useful when rapid imaging is needed or MRI is not available. Imaging can show enlarged ventricles and may reveal a blockage, bleeding, tumor, infection-related changes or other causes.

Additional tests may be used in selected cases. For suspected normal pressure hydrocephalus, doctors may assess walking and thinking before and after removing a small amount of CSF through a lumbar puncture, or may use other CSF drainage tests. Eye examination may help identify signs of raised pressure. The exact diagnostic plan depends on the patient’s age, symptoms, urgency and overall health.

Treatment Options

Hydrocephalus treatment aims to reduce harmful fluid buildup, protect brain function and address the underlying cause when possible. The right approach is decided by a specialist after assessment of the patient’s symptoms, imaging findings, age, general health and the reason CSF is accumulating. Treatment is individualized; the same procedure is not suitable for every patient.

The most established treatment category is neurosurgical diversion of CSF. This commonly involves placing a shunt, a thin tube system that moves excess fluid from the brain’s ventricles to another body area where it can be absorbed, often the abdomen. Shunts may need long-term monitoring because blockage, infection, over-drainage or under-drainage can occur. Regular follow-up helps specialists check whether the system is working properly and whether symptoms have improved.

Some patients may be candidates for endoscopic procedures that create a new pathway for CSF flow inside the brain. In infants and selected children, endoscopic techniques may sometimes be combined with treatment that reduces CSF production. If hydrocephalus is caused by a tumor, bleeding, infection or another condition, treatment may also involve surgery, infection management, oncology care, rehabilitation, physiotherapy, occupational therapy, speech therapy or developmental support. These supportive treatments help patients recover function and adapt safely to daily life.

Living With / Prognosis

The outlook for hydrocephalus varies widely and depends on the cause, how quickly it is diagnosed, the patient’s age, the presence of other medical conditions, and the response to treatment. Some people return to school, work and usual activities with follow-up. Others may need ongoing rehabilitation, developmental support or assistance with mobility, learning, speech or daily tasks.

Living with hydrocephalus often involves long-term medical follow-up, especially for patients with shunts or complex neurological needs. Follow-up visits may include symptom review, neurological examination and imaging when indicated. Patients and families are usually taught to recognize possible signs of shunt malfunction or infection, such as a return or worsening of headaches, vomiting, sleepiness, fever, irritability, vision changes, worsening balance or changes in thinking. Any concerning change should be discussed promptly with a doctor.

Families of children with hydrocephalus may benefit from coordinated care that includes pediatric neurology, neurosurgery, developmental pediatrics, rehabilitation specialists and school support. Adults may benefit from gait and balance therapy, cognitive support and home safety planning. For international patients, Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals provide diagnosis and treatment for hydrocephalus across neurology, neurosurgery, imaging and rehabilitation services.

When to See a Doctor

Medical evaluation is important when symptoms suggest hydrocephalus, especially if they are new, progressive or unexplained. Babies should be assessed if the head is growing unusually fast, the soft spot appears bulging, feeding worsens, vomiting occurs repeatedly, or the baby becomes unusually sleepy, irritable or difficult to wake. Children and adults should seek care for persistent headaches, vomiting, vision changes, seizures, worsening balance, walking difficulty, unusual sleepiness, confusion or personality changes.

People who already have a shunt or have previously been treated for hydrocephalus should contact their healthcare team if symptoms return or new neurological symptoms appear. Shunt-related problems can sometimes resemble the original hydrocephalus symptoms. Fever, redness or tenderness along the shunt path, abdominal symptoms, worsening headache, vomiting or drowsiness should be taken seriously and assessed by a qualified clinician.

Urgent medical care is needed if a person has sudden severe headache, repeated vomiting, loss of consciousness, seizure, rapidly worsening confusion, weakness, or difficulty breathing. These symptoms can have several causes, including raised pressure in the skull, and require immediate assessment. This information is for education and does not replace a doctor’s evaluation, diagnosis or treatment plan.

Frequently asked questions

What is hydrocephalus?

Hydrocephalus is a buildup of cerebrospinal fluid inside the brain’s ventricles. This can enlarge the ventricles and may increase pressure on brain tissue. It can occur at any age and should be assessed by a medical specialist.

What are the first signs of hydrocephalus?

Early signs depend on age. In infants, a rapidly enlarging head, bulging soft spot, vomiting, poor feeding or unusual sleepiness may occur. In older children and adults, headaches, nausea, vision changes, balance problems, sleepiness or changes in thinking may be early symptoms.

Is hydrocephalus curable?

Hydrocephalus can often be treated effectively, but many patients need long-term monitoring. Treatment can control fluid buildup and relieve symptoms, especially when started at the right time. The outlook depends on the cause, age, other health conditions and response to treatment.

How is hydrocephalus treated?

Treatment usually focuses on restoring or diverting the flow of cerebrospinal fluid. Options may include shunt surgery, endoscopic neurosurgical procedures, treatment of an underlying cause and rehabilitation support. A neurosurgery specialist decides the most appropriate approach after examination and imaging.

What is normal pressure hydrocephalus?

Normal pressure hydrocephalus is a form of hydrocephalus most often seen in older adults. It commonly causes a combination of walking difficulty, memory or thinking changes, and urinary urgency or incontinence. Because these symptoms overlap with other conditions, specialist assessment is important.

Can a person live a normal life with a shunt?

Many people with a shunt attend school, work, travel and take part in daily activities. They still need regular follow-up and should know the warning signs of shunt blockage, infection or drainage problems. Activity advice should be individualized by the treating doctor.

When is hydrocephalus an emergency?

Urgent care is needed for sudden severe headache, repeated vomiting, seizure, loss of consciousness, rapidly worsening confusion, severe drowsiness or new weakness. These symptoms may indicate increased pressure or another serious neurological problem. People with a shunt should also seek prompt care if previous hydrocephalus symptoms return.

References

• National Institute of Neurological Disorders and Stroke
• American Association of Neurological Surgeons
• Mayo Clinic
• NHS
• Hydrocephalus Association

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.