Chiari Malformation & Hypermobility: What Everyone with hEDS Should Know
- Maya Illipse
- Jul 14
- 8 min read
Quick Take
Chiari malformation is significantly more common in people with joint hypermobility and hypermobile Ehlers-Danlos syndrome (hEDS) than in the general population.
The hallmark symptom is a headache triggered by coughing, sneezing, laughing, or straining (a Valsalva headache).
Many people are initially diagnosed with migraine because the symptoms overlap.
A routine MRI may miss Chiari Type 0 or craniocervical instability. Some people require cine MRI or upright imaging for a complete assessment.
If you have confirmed or suspected Chiari, avoid high velocity neck manipulation ("neck cracking"), as it may worsen symptoms.
When "Migraine" Doesn't Quite Fit
Living with hypermobility often means becoming accustomed to symptoms that seem unrelated. Aching joints, recurring injuries, fatigue, dizziness, digestive problems, and nervous system dysfunction can gradually become part of everyday life. When headaches and other neurological symptoms appear, they are often assumed to be just another feature of hypermobile Ehlers-Danlos syndrome (hEDS) or hypermobility spectrum disorder (HSD).
Sometimes they are.
But sometimes they point to a different condition that deserves further investigation: Chiari malformation.
Chiari malformation occurs more frequently in people with hypermobility than in the general population, yet it remains under-recognised. Because many of its symptoms overlap with migraine, POTS, cervical instability, and hEDS itself, diagnosis is often delayed for years.
Recognising the possibility of Chiari is important because it changes the questions that should be asked, the investigations that may be needed, and in some cases, the treatment options that should be considered.
Could Your Symptoms Be Coming From the Brain-Spine Connection?
One of the biggest challenges in hypermobility is that symptoms rarely arise from a single structure.
Connective tissue is found throughout the body. It supports not only the joints, but also the ligaments that stabilise the upper cervical spine, the membranes surrounding the brain and spinal cord, blood vessels, muscles, and many other tissues.
When connective tissue is weaker than normal, the effects are not limited to flexible joints. The relationship between the skull, the upper neck, and the nervous system can also be affected.
This helps explain why some people with hypermobility develop neurological symptoms such as headaches, dizziness, poor balance, visual disturbances, swallowing difficulties, or unexplained weakness. While these symptoms have many possible causes, one condition that should be considered is Chiari malformation.
Understanding this brain-spine connection is central to a holistic approach. Rather than viewing each symptom in isolation, it encourages us to look at how the nervous system, connective tissue, and musculoskeletal system influence one another.
What Is Chiari Malformation?
Chiari malformation is a structural condition affecting the junction between the brain and the upper spinal cord.
Normally, the lower part of the brain sits comfortably within the skull. In Chiari malformation, there is not enough space at the base of the skull, causing part of the cerebellum, known as the cerebellar tonsils, to extend downward through the opening where the brain joins the spinal cord (the foramen magnum).
This displacement can interfere with the normal flow of cerebrospinal fluid (CSF), the clear fluid that cushions and protects the brain and spinal cord. In some people, it may also place pressure on the brainstem or upper spinal cord, contributing to neurological symptoms.
Several types of Chiari malformation have been described, but Chiari Type I is by far the most common form seen in adults with hypermobility. The remaining types are congenital conditions that usually present during infancy or childhood and are beyond the scope of this article.
It is also important to understand that the amount of tonsillar descent seen on MRI does not always reflect symptom severity. Some people with significant descent have few or no symptoms, while others with minimal descent experience substantial disruption because the normal flow of cerebrospinal fluid is impaired.
The Symptoms That Should Raise Suspicion
Chiari malformation can cause a wide range of symptoms, but one feature is considered particularly characteristic.
The Valsalva Headache
The classic Chiari headache is triggered by activities that briefly increase pressure inside the chest and abdomen, such as:
coughing
sneezing
laughing
straining during a bowel movement
lifting heavy objects
The pain is usually felt at the back of the head near the base of the skull and often comes on suddenly. It typically lasts from a few seconds to several minutes before settling again.
Although people with Chiari can also experience migraine, a headache that is consistently triggered by coughing or straining should not automatically be attributed to migraine alone. It is one of the most important clues that further investigation may be needed.
Other Symptoms
Not everyone experiences the same combination of symptoms. Depending on the degree of brainstem compression, disruption of CSF flow, and the presence of associated conditions, people may also experience:
neck pain or stiffness
dizziness or vertigo
poor balance or unsteady walking
blurred or double vision
ringing in the ears (tinnitus)
difficulty swallowing
hoarseness
numbness or weakness in the arms or legs
poor coordination
sleep apnoea
severe fatigue
brain fog
If a fluid-filled cavity called a syrinx develops within the spinal cord, additional symptoms such as muscle weakness, altered sensation, burning pain, or progressive scoliosis may occur.
One reason Chiari is frequently overlooked is that many of these symptoms are also common in people with hypermobility. Fatigue, dizziness, neck pain, autonomic dysfunction, and headaches are often attributed entirely to hEDS or HSD, allowing Chiari to remain undiagnosed.
Sometimes they are separate conditions. Sometimes they coexist. Distinguishing between them requires careful clinical assessment rather than assuming every symptom has the same cause.
How Is Chiari Diagnosed?
Diagnosis begins with a careful clinical history and neurological examination, followed by appropriate imaging.
The first investigation is usually a brain MRI, which allows the cerebellar tonsils and the craniocervical junction to be assessed.
Traditionally, Chiari Type I has been defined as a descent of the cerebellar tonsils of 5 mm or more below the foramen magnum.
Although this measurement is widely used, it should not be interpreted in isolation.
Some people have significant tonsillar descent but few symptoms, while others experience disabling symptoms despite minimal descent. Increasingly, specialists recognise that symptom severity depends not only on anatomy but also on how well cerebrospinal fluid (CSF) circulates around the brain and spinal cord.
For this reason, imaging findings should always be interpreted alongside the patient's symptoms and clinical examination.
Understanding Chiari Type 0
One reason Chiari can be difficult to diagnose is that not everyone meets the traditional MRI criteria.
Some people have little or no visible tonsillar descent, yet the normal flow of cerebrospinal fluid is still obstructed. This pattern is sometimes referred to as Chiari Type 0.
Although the diagnosis remains an area of ongoing research, it highlights an important principle: a normal or near-normal MRI does not always rule out clinically significant abnormalities at the craniocervical junction.
If symptoms strongly suggest Chiari but routine imaging appears normal, additional investigations may be appropriate.
These may include:
Cine MRI, which assesses the movement of cerebrospinal fluid during the cardiac cycle.
Upright MRI, which evaluates the craniocervical junction under the effects of gravity.
Flexion-extension imaging, which helps identify excessive movement of the upper cervical spine.
These investigations are not necessary for everyone, but they may provide valuable information in carefully selected patients, particularly those with connective tissue disorders.
Living Well with Chiari Malformation
A diagnosis of Chiari malformation does not automatically mean surgery.
Many people have mild symptoms that remain stable for years, while others respond well to conservative treatment aimed at reducing symptom triggers, improving neck stability, and maintaining function.
The right treatment depends on several factors, including symptom severity, neurological findings, the degree of cerebrospinal fluid (CSF) obstruction, the presence of a syrinx, and whether associated conditions such as craniocervical instability are also present.
For people with hypermobility, management should always consider the whole person rather than focusing solely on MRI findings.
Conservative Management
Many people with Chiari never require an operation. Instead, treatment focuses on managing symptoms, protecting the craniocervical junction, and improving quality of life.
Physical Therapy
Rehabilitation should aim to improve stability rather than increase flexibility.
People with hypermobility often benefit from programmes that include:
deep neck muscle strengthening
postural retraining
balance and proprioception exercises
breathing control
gentle functional strengthening
pacing and energy management
Therapists should avoid aggressive stretching or exercises that repeatedly load the upper cervical spine, particularly when instability is suspected.
At ParaMotion, our rehabilitation philosophy focuses on improving movement quality, body awareness, and neuromuscular control while respecting the unique challenges of connective tissue disorders.
Lifestyle Strategies
Simple lifestyle changes may help reduce symptom flare-ups.
These include:
staying well hydrated, particularly if POTS is also present
treating chronic constipation to minimise straining
managing persistent coughing where possible
getting adequate sleep
recognising activities that consistently trigger symptoms
gradually building physical capacity without provoking repeated symptom flare-ups
Although these strategies do not correct the underlying anatomy, they may help reduce symptom burden and improve daily function.
When Is Surgery Considered?
Surgery is generally reserved for people with clear evidence that Chiari is causing progressive neurological problems or significant disruption to cerebrospinal fluid flow.
This may include:
progressive weakness or numbness
worsening problems with balance or coordination
swallowing difficulties caused by brainstem compression
sleep apnoea related to Chiari
development or progression of a syrinx
severe headaches that do not respond to appropriate conservative treatment
The most common procedure is posterior fossa decompression, in which a small section of bone at the back of the skull is removed to create more space around the cerebellum and restore normal CSF flow.
Many patients experience significant improvement after surgery, particularly when headaches are clearly related to Chiari.
However, surgery is not appropriate for everyone. In people with hypermobility, surgeons should also assess for craniocervical instability before proceeding. If significant instability is present, addressing Chiari alone may not fully resolve symptoms.
Because connective tissue disorders affect healing, surgery should ideally be performed by teams familiar with Ehlers-Danlos syndrome and related conditions.
Final Thoughts
Living with hypermobility often means navigating symptoms that overlap across multiple body systems. It can take years to realise that headaches, dizziness, balance problems, or neurological symptoms are not simply isolated issues but may be connected through the relationship between the brain, spine, connective tissue, and nervous system.
Chiari malformation is one possible piece of that puzzle.
Recognising it does not mean expecting the worst or assuming surgery is inevitable. Instead, it means asking the right questions, seeking appropriate investigations when needed, and working with healthcare professionals who understand the complexity of connective tissue disorders.
At ParaMotion, we believe that rehabilitation begins with understanding. The body functions as an interconnected system, not a collection of separate parts. By recognising these connections, we can make informed decisions, move with greater confidence, and build treatment plans that support long-term health rather than simply managing symptoms.
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