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If you have a CSF leak, you may have noticed that your symptoms sometimes change when the weather changes.
Perhaps you can tell that a storm is approaching because your head starts to hurt. Maybe your tinnitus becomes louder, your head feels heavier, your neck becomes more uncomfortable, or your usual symptoms suddenly become much more noticeable.
And this isn’t necessarily limited to people with an active leak.
Some people continue to notice changes in their symptoms in response to weather and barometric pressure even after their leak has been successfully treated.
So what is actually happening? Does a drop in barometric pressure mean your CSF pressure has dropped too? If you feel worse, does that mean you are leaking more? And why might someone who has already been successfully treated still notice these changes?
The short answer is: the relationship between atmospheric pressure and CSF dynamics is much more complicated than simply “low pressure outside means low pressure inside”.
What is barometric pressure?
Barometric pressure, also called atmospheric pressure, is the pressure exerted by the Earth’s atmosphere.
It is constantly changing as weather systems move through.
A high-pressure system generally means that atmospheric pressure is higher than the surrounding areas, while a low-pressure system means that it is lower. As weather systems move, atmospheric pressure can rise or fall, sometimes relatively quickly.
You may notice these changes on a weather app, usually measured in hectopascals (hPa) or millibars (mbar).
It is these changes, rather than simply whether today’s pressure is “high” or “low”, that may be relevant to some people’s symptoms.
Does low barometric pressure mean low CSF pressure?
No.
This is one of the most important distinctions to understand.
Atmospheric pressure and CSF pressure are not the same thing.
It is very easy to think:
Low atmospheric pressure → low CSF pressure → more CSF leakage
But the physiology isn’t that simple.
CSF pressure and intracranial pressure are determined by the complex relationship between CSF, brain tissue, cerebral blood volume and other components within the skull. Atmospheric pressure is an external environmental pressure.
There is evidence that changes in atmospheric pressure can be associated with changes in intracranial pressure, but the relationship is not simply proportional, and the available research is limited. In particular, we do not have enough evidence to tell us exactly what happens to CSF dynamics in someone with a spinal CSF leak when atmospheric pressure changes.
One study investigating intracranial pressure during a substantial fall in atmospheric pressure actually observed an increase in intracranial pressure rather than the decrease that might intuitively be expected.
So:
A fall in barometric pressure does not mean that you have suddenly gone into lower CSF pressure.
And if you feel worse when the barometer falls, that does not automatically mean that your leak is leaking more.
So why can changes in atmospheric pressure affect how I feel?
We don’t yet have a definitive answer.
Research into weather-related headaches suggests that atmospheric pressure changes can influence some people’s symptoms, but studies have produced inconsistent results. Some people appear to be more sensitive to falling pressure, some to other types of weather change, and some people do not appear to have a meaningful response at all.
There are several proposed mechanisms.
Changes in atmospheric pressure may influence physiological systems including blood vessels, the autonomic nervous system and sensory pathways involved in headache. Changes in pressure can also affect air-filled spaces such as the sinuses and middle ear.
However, these mechanisms have mainly been studied in relation to headache and migraine, rather than specifically in people with CSF leaks.
We therefore need to be careful about assuming that a mechanism demonstrated in migraine or another headache disorder is automatically the explanation for symptoms experienced by someone with a CSF leak.
The most accurate answer is that atmospheric pressure may influence a number of physiological processes, and some people with CSF disorders may be particularly aware of those changes.
Exactly why remains uncertain.
What does this have to do with CSF dynamics?
The brain, blood and CSF exist within a tightly regulated system.
CSF is continuously produced, circulated and absorbed. Intracranial pressure is influenced by the relative volumes of brain tissue, blood and CSF within the skull.
When CSF is lost, as happens with a CSF leak, this balance can be disturbed.
In spontaneous intracranial hypotension, for example, CSF loss can be associated with changes in intracranial pressure, brain position and compensatory changes within the intracranial compartment. The clinical presentation can include headache, tinnitus, dizziness, nausea, neck pain, cognitive symptoms and fatigue.
It is therefore reasonable to ask whether changes in atmospheric pressure could interact with this already complex system.
It is possible that they do.
But at present, we do not have enough evidence to describe exactly how.
This is an important area for further research.
Why might I feel worse when the pressure falls?
When barometric pressure falls, the change in atmospheric pressure can influence physiological processes such as cerebral blood flow and vascular tone. This may affect the balance of blood, brain tissue and CSF within the skull, although the exact response varies between individuals and is not fully understood in people with CSF leaks.
Some people consistently notice that their symptoms become worse when atmospheric pressure falls, particularly around approaching storms or rapidly changing weather.
If that happens to you, the experience is real.
What we cannot say is that the worsening symptoms prove that your CSF pressure has fallen.
The distinction is important:
“My symptoms get worse when the pressure falls” is an observation.
“The pressure has fallen, therefore my CSF pressure has fallen and I am leaking more” is an interpretation.
The first may be entirely valid for you.
The second is not something we can establish from the weather alone.
Research into atmospheric pressure and headache has found inconsistent results regarding the direction of the effect. A 2019 review concluded that studies had not established a consistent relationship between pressure changes and headache, while more recent systematic reviews continue to find substantial variation between studies and individuals.
What if I feel worse when the pressure rises?
That can happen too.
When barometric pressure rises, the change in atmospheric pressure may also influence cerebral blood flow and the pressure-volume balance within the skull. The effect is not simply a matter of atmospheric pressure “pushing down” on the brain, and people can experience different responses to changing pressure.
There is no rule that says everyone with a CSF leak, or everyone with a history of CSF leak, must feel worse when atmospheric pressure falls.
Some people notice symptoms during a rise in pressure. Others notice symptoms during a rapid change in either direction. Some notice symptoms when the weather changes but cannot identify a particular pressure pattern.
There is no single “CSF leak weather pattern”.
Your experience does not have to match somebody else’s.
What about people who have already been treated?
This is an important part of the picture.
You might reasonably assume that if a leak has been successfully repaired, weather-related changes should disappear.
That isn’t necessarily the case.
Some people continue to experience fluctuations in symptoms after successful treatment, including changes that seem to coincide with atmospheric pressure or weather.
This does not automatically mean that the leak is still open.
After treatment, the body may still be adapting to changes that have occurred over the course of the illness. Symptoms can also persist for a variety of reasons, and not every ongoing symptom necessarily reflects continued CSF loss.
In people treated for spontaneous intracranial hypotension, the clinical picture after treatment can include ongoing or changing symptoms, and clinicians need to consider the whole picture rather than using one symptom in isolation to determine whether a leak remains.
There may also be individual differences in how sensitive the brain, blood vessels, autonomic nervous system and other structures are to environmental changes.
We don’t yet know whether weather sensitivity after successful treatment reflects residual changes in CSF dynamics, nervous-system sensitivity, headache biology, another mechanism, or a combination of factors.
What we do know is that experiencing symptoms when the weather changes does not, by itself, prove that your leak has reopened.
“But I know I’m worse when the pressure drops!”
We believe you.
If you have repeatedly noticed that your symptoms change when the barometric pressure changes, that is useful information about your own experience.
You don’t need to dismiss it simply because science cannot yet give you a complete explanation.
At the same time, it is important not to let that observation become a source of unnecessary fear.
A low-pressure weather system does not automatically mean:
- your CSF pressure has fallen
- your leak has started leaking more
- your leak has reopened
- a previous treatment has failed
- you need another blood patch or procedure
Likewise, feeling better during a period of high atmospheric pressure does not prove that a leak has sealed.
Weather-related symptoms cannot be used as a test for whether a CSF leak is open or closed.
What symptoms might change?
People may notice changes in symptoms such as:
- headache
- head pressure or heaviness
- tinnitus
- ear pressure or altered hearing
- dizziness or disequilibrium
- nausea
- neck pain or stiffness
- brain fog or difficulty concentrating
- fatigue
- visual symptoms
- sensitivity to sound or light
These symptoms can occur with CSF leak and spontaneous intracranial hypotension, but they can also have other causes.
Weather changes can also influence other headache disorders, including migraine, so a weather-related headache does not necessarily mean that the change is coming from the CSF leak itself. Research into weather and migraine continues to show associations with atmospheric pressure, but the strength and direction of those associations vary.
Why can I sometimes feel it before the storm arrives?
Atmospheric pressure can begin changing as a weather system approaches, before you actually see the rain, wind or storm.
Some people who are sensitive to weather changes report noticing their symptoms before the weather itself becomes obvious.
This is plausible because the atmospheric environment is already changing before the storm arrives.
However, we cannot say that this means your body is specifically detecting a change in CSF pressure.
There may be several physiological pathways involved, and research has not established one definitive explanation.
Does weather sensitivity mean my leak is still active?
No.
Weather sensitivity should not be used as evidence that a leak is still open.
If you have had treatment and continue to notice fluctuations with the weather, this does not automatically mean that the treatment has failed.
Equally, if you develop a new or persistent pattern of symptoms after treatment, it is reasonable to discuss this with your healthcare team rather than simply assuming that it is the weather.
Your symptoms, clinical history, examination and any appropriate investigations all form part of the bigger picture.
Can I do anything to help?
You cannot control the weather, but you may be able to make difficult days easier.
Listen to your body
If you recognise a familiar increase in symptoms, give yourself permission to slow down.
You may need more rest or recovery time, or to adjust your plans temporarily.
Keep your usual routines
Continue with the treatment, medication and self-management strategies that have been recommended specifically for you.
There is no established CSF-leak treatment that needs to be changed simply because atmospheric pressure changes.
Don’t panic when you see the forecast
If you know that weather changes affect you, checking the forecast may help you plan.
But try not to let the number on the weather app determine how you expect to feel.
A low barometric pressure reading cannot tell you what is happening with your CSF.
Track your own pattern
If you’re unsure whether there really is a relationship, try keeping a diary.
You could record:
Date | Atmospheric pressure | Direction/rate of change | Symptoms | Activity | Sleep | Other factors
Over time, this may help you identify whether there is a genuine pattern.
It may also reveal that other factors, such as sleep, activity, stress, temperature or another headache trigger, are contributing.
What we know – and what we don’t
What we know
- Atmospheric pressure changes can be associated with headaches in some people.
- People respond differently to changes in atmospheric pressure.
- The relationship between atmospheric pressure and headache is complex and studies have produced inconsistent findings.
- Atmospheric pressure can interact with physiological systems within the body.
- CSF dynamics and intracranial pressure are part of a complex pressure-volume system.
- People with CSF leak can experience significant fluctuations in symptoms.
What we don’t yet know
- Exactly how atmospheric pressure changes affect CSF dynamics in people with CSF leaks.
- Whether people with particular types of CSF leak are more sensitive to atmospheric pressure changes.
- Why one person may feel worse when pressure falls while another feels worse when it rises.
- Whether the speed of pressure change is more important than the absolute pressure.
- Why some people continue to notice weather-related symptoms after their leak has been successfully treated.
- Whether persistent weather sensitivity after treatment reflects changes in CSF dynamics, nervous-system sensitivity, headache biology, or another mechanism.
More research is needed.
Most importantly…
If you feel different when the weather changes, you are not imagining it just because we cannot yet explain exactly why it happens.
Your experience is valid.
But it is also important not to turn a genuine observation into an assumption that we cannot prove.
Low barometric pressure does not automatically mean low CSF pressure.
Feeling worse does not automatically mean you are leaking more.
And continuing to notice weather-related changes after successful treatment does not automatically mean that your leak has reopened.
Atmospheric pressure may influence CSF dynamics and other physiological systems, but the relationship is complex and still not fully understood.
So listen to your body, recognise your own patterns, and give yourself some grace on the days when the weather seems to make everything harder.
The weather may change how you feel. It cannot, by itself, tell you what your CSF is doing.