There is a pattern that shows up over and over in functional medicine clinics: a patient — almost always a woman, often in her 30s or 40s — arrives with a folder full of partial diagnoses. Hypermobility. Frequent fainting or racing heart on standing. Flushing, hives, food intolerances that keep expanding. Brain fog. Fatigue that no one can fully explain.
Each finding has its own specialist, its own medication, its own dead end. What is usually missing is the recognition that these are not three unrelated problems. They are three faces of one underlying pattern — the triad of mast cell activation syndrome (MCAS), postural orthostatic tachycardia syndrome (POTS), and Ehlers-Danlos syndrome, particularly the hypermobile subtype (hEDS).
This article explains why these three conditions cluster, what the current science suggests about the mechanisms, and what comprehensive care can look like — including the specific gaps we see in Oklahoma. Nothing here is a diagnosis or a promise of outcomes; the goal is to help you understand the territory so you can have a better conversation with your clinician.
The Triad in Plain English
hEDS — The Connective Tissue Layer
Hypermobile Ehlers-Danlos syndrome is a heritable connective tissue disorder. The collagen in joints, blood vessel walls, gut, skin, and even nerve sheaths is more stretchy than typical. Patients are often described — sometimes affectionately, sometimes dismissively — as “double-jointed.” But hEDS is more than flexible joints. It affects every tissue that contains collagen, which is to say nearly every tissue.
The 2017 international classification gives clinicians specific criteria for hEDS, including the Beighton scoring system for hypermobility, family history, and exclusion of other heritable connective tissue disorders. A clinician familiar with EDS can usually identify it in a single thorough exam.
POTS — The Autonomic Layer
POTS is a form of dysautonomia. When a healthy person stands up, the autonomic nervous system tightens blood vessels in the legs so blood does not pool there. In POTS, that response is impaired. Within ten minutes of standing, the heart rate jumps by 30 beats per minute or more (40 in adolescents) without a corresponding drop in blood pressure. The body is compensating for poor vascular tone by pumping faster.
The result: light-headedness, racing heart, fatigue, brain fog, exercise intolerance, and sometimes near-syncope. Symptoms often worsen with heat, dehydration, menstruation, and after meals.
MCAS — The Immune Layer
MCAS, covered in depth in our companion article, is inappropriate mast cell activation. Mast cells live in skin, gut, airways, blood vessels, and around nerves. When over-active, they release histamine, tryptase, prostaglandins, and other mediators in response to triggers that should not provoke a reaction. Symptoms span every organ system and can flare and remit unpredictably.
Why These Three Conditions Cluster
It is not coincidence that patients with one of these conditions so often have all three. The mechanisms link them at a physiological level.
Connective Tissue Affects Vascular and Mast Cell Behavior
In hEDS, the connective tissue of blood vessel walls is more elastic than typical. This makes it harder for veins to constrict on demand, which directly predisposes to orthostatic intolerance and POTS. The same connective tissue laxity may also affect the microenvironment around mast cells, contributing to membrane instability and heightened reactivity.
Autonomic Tone Modulates Mast Cells
Mast cells are densely innervated by autonomic nerves, especially branches of the vagus. In states of low parasympathetic tone — which is common in POTS — mast cells appear more prone to activation. This is part of why “calming the nervous system” can actually reduce mast cell symptoms, not just stress.
Mast Cells Affect Autonomic Function
The relationship runs both directions. Mediators released by activated mast cells can affect vascular tone and autonomic signaling, worsening orthostatic symptoms. A bad MCAS flare can trigger a POTS crash, and vice versa. The two conditions amplify each other.
The Triad Has Been Described in the Literature
Researchers and clinicians — most prominently a network of physicians treating EDS at major centers — have published extensively on the MCAS-POTS-EDS overlap over the last decade. It is not a fringe observation. It is increasingly recognized in academic medicine, even if it has not yet filtered down to most primary care.
How the Triad Typically Presents
Patients with the triad rarely describe their conditions in clinical terms. They describe a life. Common patterns:
- A childhood of “growing pains,” easy bruising, and being told they were “clumsy.”
- A history of being flexible enough to do unusual things with their joints, sometimes celebrated in dance, gymnastics, or yoga.
- Adolescent fatigue that was attributed to puberty or anemia.
- A precipitating event in their 20s or 30s — a viral illness, a surgery, a pregnancy, a tick bite — after which “things never went back to normal.”
- A growing list of food intolerances, “stress rashes,” and unexplained reactions to medications, supplements, or environments.
- Episodes of near-fainting, especially after standing in heat, after meals, or in the shower.
- A growing brain fog they cannot push through with caffeine.
- A pattern of being told by clinicians, often kindly, that they are anxious, deconditioned, or in need of more sleep.
The cumulative effect is exhausting. Patients often describe finally finding the triad framework as the first thing in years that made sense of their lives.
Why the Triad Gets Missed in Oklahoma
The challenges are structural, not personal. In Oklahoma specifically:
- EDS expertise is rare. Very few clinics in the state are equipped to identify hEDS using current criteria.
- POTS testing is uncommon outside of cardiology referral chains. A simple active stand test or tilt-table study, with proper protocols, often does not get ordered.
- MCAS screening is essentially absent in standard primary care. Most labs and most workflows are not set up to capture mast cell mediators at the right time.
- The overlap is not taught in most clinical training. Each specialty sees its own slice and refers the rest out, with no one assembling the full picture.
This is the gap Venturis Clinic was built to address — and one of the reasons we have become known as one of the few clinics in Oklahoma with a specific focus on Ehlers-Danlos syndrome and its overlap conditions.
What Comprehensive Triad Care Actually Looks Like
There is no single treatment for the triad. Care is layered, individualized, and adjusted over months. A reasonable framework:
Get the Diagnoses Right
Step one is identifying which of the three conditions are actually present and to what degree. This typically involves:
- A connective tissue exam with Beighton scoring and the broader 2017 hEDS criteria.
- An active stand test or, where indicated, a tilt-table study for POTS.
- A structured MCAS workup with mediator testing collected during or shortly after a flare.
Without these steps, treatment is guesswork.
Stabilize the Mast Cells
For patients meeting MCAS criteria, this typically means a layered approach including H1 and H2 antihistamines, mast cell stabilizers such as cromolyn or ketotifen, and supportive natural agents like quercetin or specific bioavailable forms of curcumin. The goal is to reduce reactivity enough to do the deeper work without constantly putting out fires.
Stabilize the Autonomics
POTS care includes hydration and electrolyte protocols, increased sodium intake (when appropriate), compression garments for the lower body, graded recumbent-to-upright exercise reconditioning, and in some cases medications such as fludrocortisone, midodrine, ivabradine, or low-dose beta-blockers — all decisions made with a clinician.
Support the Connective Tissue
There is no medication that changes the genetics of hEDS. But targeted physical therapy with practitioners experienced in hypermobility, joint protection strategies, and avoidance of injury-prone activities can meaningfully improve daily function and reduce flares.
Address the Underlying Drivers
The triad is rarely a stand-alone problem. Common drivers worth investigating:
- Post-viral immune dysregulation (including from COVID-19)
- Mold or mycotoxin exposure
- Persistent infections, including tick-borne illnesses
- Gut dysbiosis and intestinal hyperpermeability
- Nutrient deficiencies (B12, iron, magnesium, vitamin D, B6)
- Unresolved trauma affecting vagal tone
This is where integrative medicine adds the most, because each driver requires its own investigation and is approached one variable at a time.
Adjunctive Therapies
Certain IV therapies — for example high-dose vitamin C, glutathione, Plaquex (phosphatidylcholine), NAD+, and in carefully selected patients ozone-based therapies such as EBOO — are used as supportive measures in individualized care plans. None of these are treatments for the triad itself; they are tools applied to specific drivers in specific patients, always with attention to MCAS reactivity. Candidacy and dosing matter.
Work the Nervous System
Because vagal tone meaningfully modulates both mast cell behavior and autonomic stability, parasympathetic-strengthening work is part of a complete plan: breathwork protocols, paced exposure, sleep hygiene, and sometimes targeted somatic or trauma-informed work.
What to Look for in a Clinician
If you suspect you or someone you love has the triad, the most valuable thing a clinician can offer is the ability to see all three conditions at once. When you are evaluating an integrative or functional medicine provider, look for:
- Familiarity with the 2017 hEDS criteria and the Beighton score.
- A willingness to order or interpret POTS-appropriate testing.
- Knowledge of MCAS diagnostic criteria, including timed mediator collection.
- A care model that does not treat any one of the three conditions in isolation.
- Honesty about what care looks like over time. The triad is managed, not cured.
Frequently Asked Questions
Can you have one of the three without the others?
Yes. Many people have hEDS without significant POTS or MCAS. Others have MCAS without connective tissue findings. The triad is a frequent pattern, not a universal rule.
Is the triad a single disease?
No. They are three distinct conditions that share underlying mechanisms and frequently coexist. Care is most effective when all three are recognized.
Is the triad hereditary?
hEDS is heritable. POTS and MCAS have genetic and acquired components and tend to cluster in families with EDS, but the inheritance is not as straightforward.
What kind of doctor diagnoses the triad?
There is no single specialty. A geneticist or rheumatologist may diagnose hEDS, a cardiologist or neurologist may diagnose POTS, and an allergist or hematologist may diagnose MCAS. Integrative and functional medicine clinics with specific triad experience are often best positioned to coordinate the whole picture.
Can the triad be triggered by COVID-19?
Yes. A growing body of evidence suggests COVID-19 can unmask or trigger MCAS and POTS in susceptible individuals, including those with previously unrecognized hEDS. Many long COVID patients meet criteria for one or more triad conditions.
Where can I learn more?
For hEDS specifically, the Ehlers-Danlos Society publishes patient-friendly resources. For MCAS, the Mast Cell Disease Society’s MCAS overview is the most authoritative starting point. For POTS, Dysautonomia International offers patient education and a clinician directory.
Looking for a clinic in Oklahoma City or Tulsa that recognizes the MCAS, POTS, and EDS triad?
Venturis Clinic is one of the few practices in Oklahoma with a specific focus on Ehlers-Danlos syndrome and its overlap conditions. We approach the triad as one picture, not three problems, and we are honest about the iterative nature of this work.
This article is educational and is not medical advice. Always consult a qualified clinician for diagnosis and treatment decisions specific to your situation. Author: Dr. Alvin Philipose, DC.