Hypermobility
The Pentad Supersyndrome: Five Conditions. One Root Cause.
Connective Tissue & Chronic Illness.
Aaron Hartman MD
May 20, 2026
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If I could pick one thing that connects many (if not most) of the health issues I see in my clinic … what would be the one ring that rules them all?
It’s our connective tissues.
One of the most significant patterns I’ve identified over my career is a cluster of five conditions that appear together again and again. Not occasionally. Not coincidentally. Reliably. If you walk into my clinic with any one of them, I start looking for the other four.
I call it the Pentad Supersyndrome.
The five conditions are hypermobility, mast cell activation syndrome (MCAS), gut dysfunction, dysautonomia/POTS, and autoimmune disease. They look unrelated on the surface. Your cardiologist, gastroenterologist, rheumatologist, and neurologist may have no idea their findings are connected. But they are. And the connection starts with your connective tissue.
What happens in my clinic is I’ll see people with what appears to be three, four, five, six, seven unrelated things. Then I start getting under the hood, and ask: “are you hypermobile?”
It’s not always an immediate recognition. A lot of patients don’t know they’re hypermobile. They certainly wouldn’t have thought to bring it up to anyone. What does being “double jointed” have to do with my fibro or chronic fatigue?
This article is for the person who has been told there’s nothing wrong… yet you can’t get off the couch. It’s for the patient with a manila folder full of specialist notes and no unifying diagnosis. It’s for the person who has been dismissed, told it’s anxiety or just stress, told to come back in three months.
I want you to understand why you’re sick. And I want to give you a framework to start asking better questions.
What’s a Supersyndrome?
A syndrome is a group of symptoms that consistently occur together. A supersyndrome is a group of conditions that consistently occur together.
Hypermobility is one of those supersyndromes. If your joints are hypermobile (what most people would call being “double-jointed”) that extra flexibility doesn’t stay in your joints. All the connective tissue in your body shares this property. Your gut. Your blood vessels. Your immune system. Your autonomic nervous system. The laxity that lets you bend your thumb back to your wrist is the same laxity quietly disrupting systems throughout your entire body.
That’s why I can look at a patient presenting with fibromyalgia, POTS, and recurring gut problems and say with clinical confidence: I need to know whether this person is hypermobile.
And that’s the clinical rule at the heart of the Pentad: if you have one, look for the others.
Condition 1: Hypermobility
The Root Cause
Hypermobility affects roughly 20% of the population. Most people who have it don’t know. They may have been told as children that they were flexible. Maybe they were a gymnast or dancer. Maybe they were an athlete (there are some advantages in speed, flexibility, and power that come with hypermobility). Or they may simply know they can do things with their joints that other people can’t.
What they usually don’t know is that the same loose connective tissue that makes them flexible is placing a chronic, invisible tax on their body.
Because hypermobile joints can’t rely on ligaments and tendons for stability, the muscles have to compensate. They’re in a constant state of low-grade contraction just to hold the joints in place. That’s an energy drain that never stops. Add to that the cascade of downstream effects on the gut, on the immune system, on the autonomic nervous system … and you start to see why so many hypermobile people are exhausted in a way they can’t explain.
Hypermobility is also more common in women than men, and it has a significant genetic component. It tends to run in families, which is why I often find myself treating multiple members of the same household.
Condition 2: Mast Cell Activation Syndrome (MCAS)
The Alarm System Gone Haywire
Mast cells are your body’s alarm system. They’re located throughout every tissue, especially in areas that contact the outside world (e.g. your skin, your respiratory tract, and your digestive system). When they sense a threat, they release histamine and other inflammatory chemicals to trigger an immune response.
In a healthy system, this is lifesaving. In people with MCAS, the alarm goes off when it shouldn’t, and it goes off repeatedly, unpredictably… sometimes in response to things that should be completely benign.
You may not know you have MCAS. You probably just know that your body reacts to things other people don’t: a glass of wine that sends your heart racing, a medication that made you feel worse, a food you used to tolerate that now makes you miserable. The list of things you can’t handle keeps growing, and no one has a satisfying explanation.
Dr. Lawrence Afrin, one of the world’s leading researchers on mast cell disorders, calls MCAS “the ultimate imitator.” In his words, every doctor has been seeing these patients for years. They just haven’t been able to recognize the condition.
TILT
If you’re sensitive to chemicals, sensitive to medications, and sensitive to foods (particularly if those sensitivities have been building over time) we call this TILT (Toxicant-Induced Loss of Tolerance). There is a 94–96% chance that mast cell activation is involved. Most of these patients have been told they have anxiety, IBS, or allergies of unknown origin. They have MCAS.
Some of the most recent research in this area, including work from Dr. Afrin, suggests that MCAS may be more than a fellow traveler in the Pentad; it may actually be an upstream driver of hypermobility itself. I hold the five conditions as a clinical cluster rather than a strict hierarchy, but this emerging hypothesis is worth watching. For a deeper look at the MCAS research, I’d point you to Demystifying MCAS.
Condition 3: Gut Dysfunction
Saggy Bowels, Leaky Gut, and the Autoimmune Chain
Health and illness both begin in the gut, and hypermobility makes the gut particularly vulnerable. Many people with hypermobility have a condition called visceroptosis: a prolapse or sinking of the abdominal organs. Because the connective tissue holding those organs in place is a bit more lax (just like the joints) the abdominal organs aren’t anchored properly. They sag. And when your organs sag, your food can sit longer in your GI tract. It ferments. It creates an environment hospitable to bad bacteria: SIBO (small intestinal bacterial overgrowth), dysbiosis, and the IBS symptoms that follow.
The pressure of displaced organs also damages the gut lining, increasing intestinal permeability (what most people know as leaky gut). And leaky gut is a primary driver of autoimmune disease.
So the chain looks like this:
hypermobility → saggy bowels → leaky gut → autoimmune activation.
That’s why I always consider hypermobility when I see gut issues, bloating, slow digestion, or food intolerances that don’t make sense. It’s also why gut healing is foundational to treating the broader Pentad. You can’t address the autoimmune arm of the supersyndrome without addressing what’s happening in the intestine first.
For a deeper dive into the gut-autoimmune connection in the context of hypermobility, see Hypermobility & Chronic Health Issues.
Condition 4: Dysautonomia/POTS
When the Nervous System Can’t Regulate Itself
Dysautonomia is a dysregulation between the sympathetic nervous system (the fight-or-flight system) and the parasympathetic nervous system (the rest-and-digest system). It’s a sympathetic overdrive and a parasympathetic underdrive.
The body loses its ability to regulate itself automatically. Heart rate, blood pressure, blood flow, and digestion all require constant autonomic calibration. When that calibration fails, the symptoms can be bizarre, wide-ranging, and deeply disruptive to daily life: racing heart, dizziness on standing, frequent urination, brain fog, profound fatigue, and a feeling of being perpetually on edge.
POTS
POTS (Postural Orthostatic Tachycardia Syndrome) is one of the most common forms of dysautonomia, and I see it frequently in my hypermobile patients. The “postural” refers to a change in position: when you stand up, the heart rate races to compensate for blood that isn’t circulating efficiently. Sometimes pulse rate increases by 30 or more beats per minute just upon standing. The result is lower blood flow to the brain, which is why patients describe that characteristic “head rush” that doesn’t go away or the moment where they briefly lose their vision when they get up too quickly.
Hypermobility contributes to POTS because the connective tissue laxity extends to blood vessels. Blood pools in the legs and abdomen rather than being efficiently returned to the heart. The autonomic nervous system works overtime trying to compensate. Over time, it struggles to keep up.
This isn’t a condition that arrives all at once. It builds in stages (I typically track four). The early phases often present as mild anxiety and slightly low blood pressure. As stressors accumulate (e.g. mold exposure, gut dysfunction, nutrient deficiencies) the condition progresses. By phase four, which can develop 12 – 24 months after onset, connective tissue repair is compromised and recovery from even minor illness becomes difficult.
For the full four-phase framework, see The Link Between Hypermobility & Dysautonomia and Demystifying POTS.
Condition 5: Autoimmune Disease
When the Immune System Turns on Itself
One in twelve Americans has an autoimmune disease. Another 20% have a positive autoantibody. That just means their immune system has begun producing antibodies against its own tissues, even if it hasn’t yet progressed to full disease.
Autoimmunity is the immune system becoming overreactive. We’re accustomed to thinking about autoimmune disease as specific diagnoses: Hashimoto’s thyroiditis, rheumatoid arthritis, celiac disease, Crohn’s, etc. But the autoimmune spectrum is far broader than that. PCOS, IBS, IBD, eczema, rosacea … these are all part of the same spectrum of immune dysregulation. And they appear with striking frequency in hypermobile patients.
I already noted how visceroptosis leads to leaky gut and then to immune activation. A second mechanism can drive the hypermobility-autoimmune connection: the cortisol pathway.
People with hypermobility have a larger amygdala, the brain structure that regulates emotional memory and stress response. This means hypermobile people often have a heightened level of arousal and alertness (one of the reasons that hypermobility can actually be a “superpower”). Their bodies can overreact to stimuli. In today’s world, that translates to chronically elevated cortisol. And chronically elevated cortisol drives leaky gut, upregulates the immune system’s antibody response, and compounds the very autoimmune risk that gut dysfunction is already creating.
Cortisol is the one hormone in your body that tends to increase with age, while thyroid hormones, sex hormones, and insulin tend to decline. That’s already a problem for everyone. For hypermobile people who are starting with elevated baseline cortisol, it becomes a compounding liability as they get older.
The Clinical Rule: If You Have One, Look for the Others
The Pentad conditions are rarely isolated. When I see someone in my clinic with what appears to be three, four, five, or even seven unrelated things, the question I ask is: are you hypermobile?
That one question reorganizes everything. It gives me a framework for understanding why the cardiologist found POTS, the gastroenterologist found IBS, the rheumatologist found a positive ANA, and the allergist found unexplained food reactions … and why none of them connected the dots.
The GIB Framework
The GIB framework (Gut, Immune, Brain) is a shorthand I use clinically. These three systems are almost always involved together. If someone presents with gut dysfunction, I look at immune status and neurological/autonomic function. If they present with dysautonomia, I ask about gut symptoms and autoimmune history. The three are rarely independent.
Figuring out someone’s patterns (how their hypermobility is connected to their underlying disease) is one of the things I do every single day in my clinic. It’s not a simple puzzle. But it is a solvable one, once you have the right framework.
What This Means for You
If you recognize yourself in this article, you haven’t been imagining it. You’ve probably been gaslit. Dismissed. I’ve watched it happen over and over: patients who’ve spent years seeing specialists, accumulating diagnoses, trying treatments that help partially or temporarily, all while carrying the quiet fear that maybe they’re just too sensitive, too complicated, or somehow making it worse by paying attention to it.
That narrative is wrong.
These conditions are connected. They have a common root. And understanding that root is the first step toward treating it systematically rather than chasing individual symptoms with individual specialists.
I know this from both clinical experience and personal experience. For about four years, I had a positive antimitochondrial antibody (AMA). I was on the autoimmune spectrum myself. Through a dedicated process of gut healing, environmental cleanup, and stress management, I was able to clear it. I’m not sharing that as a guarantee. Every patient’s picture is different. But I am sharing it as evidence that the framework works. Root cause medicine, applied to the right pattern, can produce real change.
The medical community is catching up. Hypermobility is starting to work its way into the literature. But I don’t want you to wait for that process to run its course, especially if you’re already dealing with multiple conditions and not getting answers.
Your Next Step: Understand Your Pattern
If any of the five conditions described here sound familiar, the right next step isn’t to make an appointment with another specialist who will look at one piece of the puzzle.
The right next step is to understand your pattern.
The ConnectCODE Quiz helps identify your individual pattern of conditions most likely influencing your health, and determines where hypermobility may be playing a role. It’s the entry point into the kind of root-cause thinking that can finally make sense of a history that conventional medicine hasn’t been able to explain.
Take the ConnectCODE Assessment →
This article is part of a broader series on hypermobility and its connections to chronic illness. For deeper reading on individual conditions, see: