Most cases of hydrocephalus cannot be entirely prevented, but many of the conditions that cause it are avoidable. Hydrocephalus develops when cerebrospinal fluid builds up in the brain’s ventricles, and the triggers range from birth defects and infections to head injuries and strokes. Reducing your risk means targeting those underlying causes at every stage of life.
Folic Acid and Neural Tube Defects
One of the most actionable steps applies to women of childbearing age. Neural tube defects, which occur when the brain and spinal cord don’t form properly in early pregnancy, are a known cause of congenital hydrocephalus. Folate plays a direct role in brain development, and deficiencies in how the body processes folate have been linked to the developmental failures that lead to fluid buildup in a newborn’s brain.
The CDC recommends that all women capable of becoming pregnant take 400 micrograms of folic acid daily, ideally starting at least one month before conception and continuing through pregnancy. Because neural tube defects develop very early, often before a woman knows she’s pregnant, the advice applies even if you’re not actively planning a pregnancy. Folic acid is available over the counter in most prenatal vitamins and standalone supplements, and it’s also added to enriched grain products like bread and cereal.
Avoiding Infections During Pregnancy
Several prenatal infections can damage a developing baby’s brain and lead to hydrocephalus. Toxoplasmosis is one of the most well-documented culprits. It spreads through undercooked meat, unwashed produce, and contact with cat feces. Pregnant women can lower their risk by eating thoroughly cooked food, avoiding processed deli meats, and having someone else handle the cat litter box.
Cytomegalovirus (CMV) is another concern. It spreads through close contact with young children’s saliva and urine, so frequent handwashing is essential, especially after changing diapers or wiping a child’s nose. When possible, avoiding prolonged exposure to childcare or nursing care settings during pregnancy reduces the chance of picking up CMV.
Rubella can cause severe brain damage in a fetus, but it’s entirely preventable through vaccination. All women of childbearing age should confirm their immunizations are up to date before becoming pregnant. Safe sexual practices also help eliminate the risk of transmitting syphilis, HIV, and herpes during pregnancy, all of which can harm fetal brain development.
Vaccination Against Meningitis
Bacterial meningitis is one of the leading causes of acquired hydrocephalus in children. The infection inflames the membranes surrounding the brain and can scar the pathways that drain cerebrospinal fluid. Among survivors, more than 20% develop lifelong disabilities including hydrocephalus, hearing loss, and cognitive impairment.
Three vaccines target the bacteria most commonly responsible: the Hib vaccine (Haemophilus influenzae type b), the pneumococcal conjugate vaccine, and the meningococcal vaccine. Countries with high vaccination coverage have seen substantial drops in bacterial meningitis cases. Hib meningitis in particular has declined dramatically wherever the Hib vaccine has been introduced. These vaccines are part of the standard childhood immunization schedule, and keeping your child’s shots on track is one of the most effective ways to prevent the kind of brain infection that causes hydrocephalus.
Protecting Premature Infants
Babies born prematurely face a specific risk: bleeding inside the brain’s ventricles, called intraventricular hemorrhage. This bleeding can block the normal flow of cerebrospinal fluid and lead to hydrocephalus. The earlier a baby is born, the higher the risk.
Prevention starts before delivery. When preterm birth is expected, doctors typically give the mother corticosteroids to help mature the baby’s brain and blood vessels, along with magnesium sulfate for additional neuroprotection. Transferring the mother to a hospital with a specialized neonatal intensive care unit before delivery also improves outcomes. After birth, careful management of the infant’s blood pressure and circulation reduces the chance of the kind of sudden blood flow changes that trigger brain bleeds. Hospitals increasingly use standardized neuroprotective care bundles, checklists of practices designed to keep premature infants’ brain environments as stable as possible during their first critical days.
Preventing Head Injuries
Traumatic brain injury is a major cause of hydrocephalus in older children and adults. Severe blows to the head can cause bleeding or swelling that disrupts normal fluid drainage, sometimes weeks or months after the initial injury.
The prevention strategies are straightforward but worth repeating. Wear a seatbelt every time you’re in a car. Wear a helmet when riding a bike, motorcycle, scooter, skateboard, or horse, and during contact sports like football, ice hockey, and boxing. Helmets also matter for skiing, snowboarding, and baseball. For older adults, fall prevention is equally important: removing tripping hazards at home, installing grab bars in bathrooms, and staying physically active to maintain balance all reduce the risk of the kind of head injury that can lead to hydrocephalus later.
Managing Blood Pressure and Stroke Risk
In adults, strokes and brain hemorrhages can block cerebrospinal fluid pathways and cause hydrocephalus. Uncontrolled high blood pressure is the single biggest modifiable risk factor for stroke. Keeping blood pressure in a healthy range through diet, exercise, medication if needed, and limiting alcohol significantly lowers stroke risk and, by extension, the chance of developing hydrocephalus as a complication.
Other vascular conditions can also play a role. Abnormal widening of arteries at the base of the brain, while rare, has been documented as a cause of acute obstructive hydrocephalus in people with longstanding hypertension. The broader point holds: cardiovascular health and brain health are deeply connected, and the same habits that protect your heart protect your brain’s fluid drainage system.
Genetic Testing for Inherited Forms
A small percentage of hydrocephalus cases are genetic. The most well-known inherited form is X-linked hydrocephalus, caused by mutations in a gene called L1CAM. It primarily affects boys and is passed down through mothers who carry the mutation. Clinical genetic testing is available to identify carriers and assess risk in families with a history of the condition.
If hydrocephalus has occurred in your family, particularly in male relatives, a genetic counselor can help you understand whether testing makes sense. The test can be ordered by a physician or genetic counselor and is used for risk assessment, screening, and confirming whether a known mutation is present. For families who carry the mutation, this information allows for informed reproductive decisions and early monitoring of future pregnancies.
Recognizing Early Warning Signs
When prevention isn’t possible, early detection is the next best thing. Catching hydrocephalus before it causes permanent brain damage dramatically improves outcomes. In infants, the warning signs include a rapidly growing head, a bulging soft spot on the skull, eyes that are fixed downward (sometimes called “sunsetting”), vomiting, feeding problems, unusual sleepiness, irritability, and seizures. A slowing or loss of developmental milestones like walking or talking is also a red flag.
Prenatal ultrasound can detect hydrocephalus before birth, and postnatal ultrasound through the soft spot on a baby’s skull is a simple, low-risk first test. In older children and adults, persistent headaches, vision changes, difficulty with balance, and cognitive decline warrant prompt evaluation. Early diagnosis and treatment improve the chance of a good recovery, making awareness of these signs a form of prevention in its own right.