Shunt Infections – What You Need to Know

Jun 23, 2026 | Hydrocephalus Support Association

Shunt infections are one of the most serious complications for people living with hydrocephalus that rely on a shunt system to manage cerebrospinal fluid (CSF). Understanding what they are, how to recognise them, how they are treated, and what recovery entails can help individuals and families act early and confidently when concerns arise.

 

A shunt infection happens when bacteria reach any part of the shunt system. Shunt infections are most common in the first few months after surgery, but they can occur at any time. The infection may involve the skin and wound area, the shunt tubing, or the CSF itself.

 

Why Do Shunt Infections Happen?

There are two main ways bacteria can gain access:

 

During or shortly after shunt surgery:
The most common time for a shunt infection to occur is in the weeks or months following surgery. Bacteria that normally live on the skin can sometimes enter the body during the operation or while the surgical wounds are healing. Even when surgery is performed under strict sterile conditions, this risk cannot be completely eliminated. Once bacteria attach to the shunt tubing or valve, they can be difficult to remove without further treatment.

 

From an infection elsewhere:
Less commonly, bacteria from an infection in another part of the body can spread to the shunt system, usually through the bloodstream. Infections such as abdominal, urinary tract, or bloodstream infections for example may increase this risk. It is important for healthcare providers to know that a person has a shunt when treating any infection.

Certain shunt types that drain into different body areas (such as the abdomen, chest, or bloodstream) can influence how an infection presents and how quickly it spreads. Symptoms may appear in the area where the shunt drains, and some shunt types can allow infection to become serious more rapidly, making early medical assessment especially important.

 

Common Symptoms to Watch For:

The symptoms of a shunt infection can vary widely depending on the person’s age, type of shunt and how advanced the infection is. In general, these are the key signs to know:

 

General symptoms

• Fever or chills not explained by another illness
• Redness, warmth or tenderness over the shunt incision or along the tubing
• Headache that is new or more severe than usual
• Nausea and vomiting
• Tiredness, irritability, confusion or changes in behaviour
• Poor appetite or general malaise

 

Infants and young children

• Bulging soft spot (fontanelle)
• High-pitched crying or unusual fussiness
• Poor feeding or lethargy

 

Shunt-specific signs

• Abdominal pain if the shunt drains to the belly
• Chest discomfort, coughing or breathlessness with chest-draining shunts
• Rapid heartbeat or feeling very unwell with shunts draining into the bloodstream — this can indicate a blood infection and needs urgent attention.

 

Important: These symptoms may also overlap with shunt blockage or malfunction (a non-infectious problem), so urgent assessment by a neurosurgical team is always recommended when symptoms appear.

 

How Shunt Infections Are Diagnosed

Doctors use a combination of clinical observation and tests to confirm whether a shunt is infected:

Clinical evaluation: A medical exam to relate symptoms with shunt placement and neurological status.
Fluid cultures: Samples from wounds or CSF are checked for bacteria.
Blood tests: These detect infection or inflammatory markers.
Imaging: MRI, CT scans or X-rays help evaluate shunt function and look for signs of malfunction or infection.

 

Because infections can mimic other shunt issues, accurate diagnosis is critical and often requires hospital evaluation.

Treatment — What Typically Happens

Treating a shunt infection almost always involves surgery and antibiotics:

• Removal of the infected shunt: Bacteria can cling to the shunt tubing in a “biofilm” that antibiotics alone may not fully eradicate.
• Temporary external drain: A temporary device (External Ventricular Drain) keeps CSF flowing while antibiotics work.
• Intravenous antibiotics: Given over days to weeks, depending on the type of bacteria and response.
• Temporary drain replacements: Sometimes needed if the drain becomes contaminated.
• New shunt placement: Once the infection clears and tests confirm resolution, a new shunt can be surgically placed.

 

This multi-step approach helps stop the infection and safely restore CSF drainage. 

 

Management of a confirmed shunt infection may involve more than one surgical procedure. In many cases, this includes removal of the infected shunt system, followed by a period of infection control using antibiotics (with or without temporary cerebrospinal fluid diversion), and subsequent implantation of a new permanent shunt once the infection is adequately treated.

However, the timing and number of procedures are determined on an individual basis. Factors such as the patient’s clinical stability, infection severity and type, prior surgical history, and overall risk profile are carefully considered. In some situations, clinicians may opt for a more conservative or modified approach if the risks associated with further surgery are assessed to outweigh the potential benefits.

What to Expect During Recovery

Recovery from a shunt infection often takes time and may involve:

• Hospital stays: For antibiotic treatment and monitoring of the temporary drain.
• Multiple procedures: At least one surgery to remove the infected shunt and another to implant a permanent one once infection control is achieved.
• Follow-up care: Ongoing appointments to check shunt function and look for any signs of reinfection or malfunction.
• Support at home: Caregivers play a key role in wound care, symptom monitoring, medication management and emotional support.

 

Families often find peer support and shared experiences valuable during this time, as recovery can be emotionally challenging as well as physically demanding.

 

Can Shunt Infections Be Prevented?

Not all infections can be prevented, but risk can be lowered by:

• Keeping incisions clean and dry during healing.
• Promptly reporting any new or unusual symptoms to a healthcare provider.
• Following all neurosurgical team recommendations after surgery.
• Regular medical reviews to monitor shunt function and health overall.

 

Key Takeaways

Shunt infections are a serious but treatable complication for people living with hydrocephalus, and early recognition can make a significant difference to outcomes. Symptoms may be subtle at first and can overlap with shunt malfunction or other illnesses, which is why it is so important to trust your instincts. Parents, carers and individuals with hydrocephalus often know when something is “not quite right”, even if symptoms seem mild or do not fit neatly into a checklist.

If concerns persist or symptoms worsen, it is appropriate to advocate for further assessment, repeat testing, or specialist review by a neurosurgical team. Prompt medical attention, thorough investigation and clear communication with healthcare providers can help ensure infections are identified and treated as early as possible.

Ongoing follow-up, education and self-advocacy are key parts of safely living with a shunt and reducing the risk of serious complications.

 

Disclaimer

Reviewed by medical professionals Dr Brindha Shivalingham and Jane Rafteseth FEB 2026