Centeno-Schultz

What This Page Is and Isn’t

This page offers a plain-language explanation of Craniocervical Instability (CCI), along with what living with it for years actually looks like from the inside, before anyone found it. CCI is the kind of condition many people search for by symptoms first, long before they know its name. They search the feeling instead: a head that feels too heavy, pressure at the base of the skull, neck pain with dizziness, brain fog that will not lift.

In my case, CCI was diagnosed alongside Eagle Syndrome. What followed led to diagnoses of Chiari Malformation, Tethered Cord Syndrome (TCS), and Hypermobile Ehlers-Danlos Syndrome (hEDS), the connective tissue disorder underneath all of it.

What I share here comes from lived experience, a path I can point to because I walked it. This is not medical advice and does not replace consultation with a qualified healthcare professional.

What Is Craniocervical Instability?

Craniocervical instability occurs when the ligaments connecting the skull to the upper spine can’t provide adequate structural support. In some cases, this instability can place strain on nearby neurological or vascular structures. People sometimes search for this more generally as upper cervical instability or neck instability, especially before they know the formal term.

CCI can result from several causes. In my case, it was caused by ligament laxity. The ligaments were too loose to do their job. That laxity is a feature of hEDS, a connective tissue disorder I didn’t know I had until after the instability was found.

The head is heavy. The ligaments are supposed to hold it in place. When they can’t, the muscles of the neck and jaw try to do the job instead. They weren’t built for it. That’s why in my case I had chronic pain radiating through my head, jaw, face, and neck. It is also why phrases like “my head feels too heavy for my neck” or “my neck feels like it can’t support my head” are often how people describe this before they have a name for it.

Why It Gets Missed

The symptoms work against early identification. Headaches at the base of the skull get attributed to tension. Brain fog gets called stress. Neck pain becomes tech neck and poor posture. Temporomandibular joint (TMJ) issues get met with mouth guards and Botox.

Each symptom goes to a different specialist. None of them connect to the pattern. The pattern stays invisible. It is why people ask questions like “Why does my head feel heavy on my neck?”, “Why do I feel off balance and foggy?”, and “Why do I get neck pain and dizziness together?” long before they search craniocervical instability.

CCI may not always appear on a standard MRI. Because standard MRIs are typically performed lying down, dynamic instability may not always be apparent. In my case, the scans came back normal more than once.

Additional imaging like an upright MRI or a Digital Motion X-ray (DMX) can sometimes capture what standard imaging misses. However, these imaging options are not routinely offered in many clinical settings.

In my case, it was motion that told the story.

Questions I Found Myself Asking

What does craniocervical instability feel like?

Why does my head feel too heavy for my neck?

Can CCI cause brain fog and dizziness?

Why does my neck feel like it can’t support my head?

Does CCI show on a regular MRI?

What is the difference between an upright MRI and a standard MRI?

What is a DMX and do I need one?

Is craniocervical instability the same as cervical instability?

Can CCI cause difficulty swallowing?

Why do I feel worse sitting up?

Can neck problems cause brain fog?

Why does neck pain get worse when I move my head or hold it up?

Can symptoms fluctuate day to day?

Symptoms People Commonly Describe

Persistent headaches or pressure at the base of the skull. A head that feels too heavy to hold up. Neck pain and stiffness that doesn’t resolve with physical therapy or stretching. Brain fog, difficulty concentrating, or slowed thinking. Dizziness or vertigo, especially with head movement. Difficulty swallowing or a sensation of something stuck in the throat. Blurred vision, light sensitivity, or seeing stars. Ear ringing. Jaw pain. Pain that worsens in a car, especially with every bump and turn. Fatigue that wraps around you.

Not everyone experiences all of these, and this list is not exhaustive. The combination and severity vary. What’s common is that the symptoms stack. They overlap with dozens of other conditions. No one connects them. For some people the combination is what stands out. Neck pain and dizziness together. Head pressure and brain fog together. Feeling worse upright. Feeling like the neck is working harder than it should just to hold the head up.

What I Wish I’d Known

Some of what follows may feel familiar if you’ve read the symptom posts. That’s by design. The posts carry the experience. This page carries more of the clinical context.

For years, I told my doctors that my head felt too heavy, like it was hard to hold it up. I said it in appointment after appointment. It wasn’t pursued as a possible structural symptom.

I was told it was stress. Maybe perimenopause. Tech neck. Anxiety.

Every specialist handled their piece. The orofacial specialist focused on the jaw. The neurologist treated the headaches. The orthopedic specialist offered a diet list and a trigger point hook. At one point, I was referred to both a pain psychologist and a pain psychiatrist. Two separate referrals. Neither addressed the structural problem.

No one looked at all of it.

It took 111 medical appointments across 26 providers before someone ordered the right imaging. A DMX revealed slippage in motion that had not appeared on my prior standard MRIs. I was told the instability was “extreme” and that I was a surgical candidate.

I wish I’d known that normal imaging results aren’t the same as nothing being wrong. Sometimes it means the testing doesn’t capture what’s happening when you’re upright, or in motion, or simply living in your body.

When symptoms stretch across multiple specialties, they can still belong to the same underlying problem. No one told me that.

And even after the diagnosis, I still didn’t know what came next. Finding someone who had been through this surgery took its own time.

What I Did Next

Before I had a name for what was happening, I started writing down every symptom. What it felt like, when it happened, what made it worse. I even documented what I had eaten, looking for anything that might explain the pattern. I brought that log to every appointment. Tracking the pattern helped me hold onto what I knew, even when no one else confirmed it.

When the answers didn’t match what my body was telling me, I looked for other opinions. I asked whether the tests I’d undergone were sufficient for the symptoms I was describing.

Over time, the pattern became harder to dismiss.

Once CCI was confirmed, the work shifted. I consulted with multiple neurosurgeons. Additional imaging followed, and with it came subsequent diagnoses: Chiari malformation, and eventually Tethered Cord Syndrome (TCS) , hEDS, Postural Orthostatic Tachycardia Syndrome (POTS), and Mast Cell Activation Syndrome (MCAS). Each consultation added a layer.

Once I made the decision to have an occipital to C3 fusion and found my surgical team, I asked them for a patient I could speak to who had been through this surgery. They connected me, and that conversation was one of the most valuable things I did to prepare.

For the full account of what the surgery and recovery looked like, see Occipital to C3 Fusion with Chiari Decompression: A Patient’s Perspective.

Often Discussed Alongside

Craniocervical Instability (CCI) is frequently seen alongside other conditions, and many patients receive multiple related diagnoses:

Chiari Malformation

Hypermobile Ehlers-Danlos Syndrome (hEDS)

Tethered Cord Syndrome (TCS)

Postural Orthostatic Tachycardia Syndrome (POTS)

Mast Cell Activation Syndrome (MCAS)

Eagle Syndrome

Occipital Neuralgia

TMJ Disorder

Myofascial Pain Syndrome