A cerebrospinal fluid (CSF) leak happens when a tear in the membrane around your brain or spinal cord lets fluid escape. Cranial leaks can cause headaches and nasal drainage. Spinal leaks may lead to headaches, neck stiffness or back pain. A healthcare provider can diagnose and treat it.
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A cerebrospinal fluid (CSF) leak is when the fluid surrounding your brain and spinal cord leaks out from where it’s supposed to be. It happens when there’s a tear or hole in the dura mater. This is the outer layer of the protective membrane (meninges) that surrounds your central nervous system.
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Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy
The most common symptom is a headache. You may also have other symptoms that can vary depending on whether the tear is near your brain or spinal cord.
CSF cushions and protects your brain and spinal cord. Too much fluid loss can be dangerous. It may lead to brain injuries or infections. Some complications can be life-threatening.
There are two types of cerebrospinal fluid leaks based on location:
CSF leak symptoms vary based on where they are and how severe they are. In some cases, if you have a small leak, you may not notice any symptoms or you might mistake the symptoms for something else. If anything doesn’t seem right, contact a healthcare provider. CSF leaks can be serious.
Common symptoms of a leak near your brain may include:
Common symptoms of a leak near your spinal cord may include:
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Most cerebrospinal fluid leaks happen after an injury. Common injuries may include:
Some leaks may happen after:
In fewer cases, a leak may happen without an injury. Sometimes, it’s linked to health conditions you’re born with that affect the membrane that holds CSF.
Anyone can develop a CSF leak, especially if you have had a recent injury. You may be more at risk if you have:
Spontaneous leaks, those that happen without an injury, are more common in women between age 33 and 52.
Yes, some severe leaks can be life-threatening. CSF cushions your brain and spinal cord. It protects them from injury. When you lose too much fluid, your brain can sag or shift inside your skull. This increases your risk of injury, potentially leading to permanent brain damage.
A leak also raises your risk of serious infections like meningitis. This is a dangerous infection of the protective layers around your brain and spinal cord. Meningitis is a medical emergency that requires immediate treatment.
A healthcare provider can diagnose a cerebrospinal fluid leak using a physical examination, along with gathering information about your symptoms. They’ll also ask you questions about your medical history.
Testing confirms a diagnosis. The type of testing may vary based on the location of the leak.
Special diagnostic tests like DSM (digital subtraction myelography) or DSA (digital subtraction angiography) may be required in complex cases.
A CSF leak isn’t something you can diagnose or treat on your own. If you suspect you have this condition, you should talk to a healthcare provider as soon as possible.
Your provider will give you specific instructions to follow if you have a cerebrospinal fluid leak. These can vary based on the location and severity.
In some cases, they may recommend bed rest. This is to let the cranial or spinal leak injury heal on its own. Your provider may also recommend that you stay hydrated, avoid caffeine and take either over-the-counter medications or prescribed medications to relieve symptoms.
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Your provider may also recommend avoiding pressure triggers, like sneezing or coughing. This can be easier said than done, we realize. But you can lower your risk by staying away from dust, allergens or high-pollen areas, especially if you know you’re sensitive to them.
Minimally invasive procedures to treat CSF leaks near your brain may include:
Some cranial CSF leaks need surgery to stop problems from happening. These may include:
Your provider may recommend one of the following treatments for a CSF leak around your spinal cord:
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Your provider will give you the best advice on what your recovery time looks like. You may need a few days of rest to feel better. If you had surgery, you may need several weeks to months to fully heal.
You should talk to or see a healthcare provider if you think you have a leak. The first symptom is usually a headache (for cranial and spinal types) and a runny nose that doesn’t produce mucus (for the cranial type), among other symptoms.
If you have a known leak and you’re receiving treatment, let your provider know if you have new or worsening symptoms.
If you have a cranial CSF leak and you notice the following sudden symptoms, visit the emergency room:
The following sudden spinal CSF leak symptoms may require emergency medical attention:
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Most CSF leaks get better with rest or surgery. But they can come back, even after healing.
Cerebrospinal fluid leaks are unpredictable and can’t always be prevented. Still, you may be able to lower your risk of injury-related causes. Wearing protective gear is the best way to do this. Head, neck, back or facial trauma may lead to a leak. Use personal protective or safety equipment at work and during daily activities when applicable.
CSF leak happens unpredictably, so it’s not preventable. However, you can try to reduce the risk of it happening by protecting yourself from conditions or circumstances that might cause a leak. However, that only works with causes related to injuries.
The most important thing you can do to avoid an injury-related CSF leak is to wear safety equipment. Face, head, neck and back injuries can cause the kind of damage that makes a CSF leak possible. Whether you're on the job or on your own time, using safety gear and equipment can help you avoid this possibility.
If you have a CSF leak, you should follow your healthcare provider’s guidelines on how to care for yourself. They’re the best source of information for what you can and should do. They can also tell you what problem or warning signs to watch for and avoid.
You should talk to or see a healthcare provider if you think you have a CSF leak. While this condition doesn’t usually cause severe or life-threatening complications, it shares symptoms with urgent and dangerous conditions.
If you know you have a CSF leak, your healthcare provider will schedule follow-up visits to monitor you as you recover. You should also see them if you notice symptoms getting worse or causing new disruptions in your daily life.
If you have a CSF leak, you should go to the ER if you have a sudden, severe headache, muscle weakness or trouble standing up. You should also see them if you notice any tingling or numbness anywhere on your body, especially in your hands, feet, legs and arms. Those can be a sign of injury to your spinal cord, which can lead to permanent paralysis.
You should also get emergency medical attention if you have stroke-like symptoms. These include:
Your body is made of a lot of fluid, so it might be surprising to learn that losing a small amount of cerebrospinal fluid (CSF) can cause such uncomfortable symptoms. Fortunately, your provider can help find the leak and recommend the best treatment. You may only need bed rest to heal. Or in some cases, surgery may be the safest option. Your care team will guide you toward the right approach so your body can recover and you can start feeling better.
If you have a neurological condition, you want expert advice. At Cleveland Clinic, we’ll work to create a treatment plan that’s right for you.
Last reviewed on 08/03/2025.
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