For some people with hypermobile Ehlers-Danlos syndrome (hEDS), digestive symptoms become far more serious than occasional nausea or bloating. Eating may provoke pain, fullness, reflux, vomiting, or profound fatigue. Oral intake may gradually fall until nutritional support—including a feeding tube—is considered necessary.

In the accompanying Caring Medical video, a young woman named Allyson describes this type of decline. She had Ehlers-Danlos syndrome, widespread joint pain, dizziness, severe fatigue, limited stamina, and progressive difficulty eating. She stopped working, took time away from school, and became largely homebound. Eventually, she required tube feeding.

After undergoing a multimodal program at Caring Medical that included cervical evaluation, curve-correction exercises, postural work, and injection treatments, Allyson reported substantial improvement. At the time of filming, she said she had not used her feeding tube for three months and was preparing to meet with her dietitian to determine whether it could be removed. She had returned to work and school, could walk farther, participate in family activities, and complete her day without routinely needing a nap.

Her recovery is encouraging, but it is important to interpret it correctly. This is one patient’s experience—not a controlled clinical trial. It cannot prove that cervical instability caused her digestive problems, that her vagus nerve “regenerated,” or that Prolotherapy made tube feeding unnecessary. It does, however, illustrate why patients with hEDS and severe gastrointestinal symptoms often need a broad, multidisciplinary assessment.

Why gastrointestinal symptoms are common in hEDS and hypermobility disorders

Ehlers-Danlos syndromes are heritable connective-tissue disorders. The hypermobile type is characterized primarily by generalized joint hypermobility, joint instability, soft-tissue injury, and chronic pain. Our overview of EDS and hypermobility disorders discusses how connective-tissue laxity may affect multiple joints and body systems. Many patients also experience symptoms involving the autonomic nervous system, digestive tract, bladder, sleep, and other body systems.

Research supports a genuine association between hEDS or hypermobility spectrum disorders (HSD) and gastrointestinal symptoms. A comprehensive gastroenterology review reported that abdominal pain, post-meal fullness, constipation, reflux, nausea, and disorders of gut–brain interaction are common in this population. The authors emphasized that symptoms are usually multifactorial rather than attributable to a single structural abnormality. (1)

Possible contributors include:

• Disorders of gut–brain interaction, such as functional dyspepsia or irritable bowel syndrome
• Abnormal gastrointestinal motility
• Postural orthostatic tachycardia syndrome (POTS) or other autonomic dysfunction
• Medication effects, particularly opioids and other drugs that slow the bowel
• Pelvic-floor dysfunction
• Reflux, hiatal hernia, or other structural disorders
• Food restriction, nutrient deficiencies, and deconditioning
• Small intestinal bacterial overgrowth (SIBO) or other microbiome-related disorders in selected patients
• Mast-cell, inflammatory, endocrine, neurologic, or psychological factors in selected patients

This complexity is why “it is all the vagus nerve” and “it is all functional” are both usually inadequate conclusions.

The relationship among hEDS, POTS, and digestive dysmotility

POTS is a form of orthostatic intolerance in which standing produces an excessive rise in heart rate along with symptoms such as lightheadedness, fatigue, palpitations, weakness, brain fog, and exercise intolerance. Gastrointestinal symptoms frequently coexist.

A 2024 review described the increasingly recognized overlap among EDS, POTS, and gastrointestinal disorders, including gastroparesis. The authors proposed autonomic dysfunction as one possible connecting mechanism but stressed that a clear pathophysiologic pathway has not been established. (2)

In a tertiary-center study of 218 patients with hEDS, 136 underwent motility testing. Of those tested, 76.2% had an identified form of dysmotility. POTS was the only independent predictor in the adjusted analysis, increasing the odds of diagnosed dysmotility. These findings do not mean that three-quarters of all people with hEDS have objective dysmotility—the tested group was a selected subgroup at a referral center—but they reinforce the value of autonomic assessment when severe digestive and orthostatic symptoms occur together. (3)

Allyson’s dizziness, poor standing tolerance, severe fatigue, and digestive problems therefore represent a symptom cluster that is recognized in the broader hEDS literature. They do not, by themselves, identify the precise cause.

Why eating can become so difficult

The digestive tract moves food through coordinated muscular contractions controlled by the enteric nervous system, autonomic nerves, hormones, immune signals, and local reflexes. Gastroparesis means delayed emptying of the stomach without a mechanical obstruction. Symptoms may include early fullness, nausea, vomiting, bloating, upper abdominal discomfort, and difficulty maintaining adequate nutrition.

However, similar symptoms can occur even when gastric-emptying tests are normal. Disorders of gut–brain interaction can produce severe nausea, fullness, pain, or food avoidance without a fixed obstruction. Small-bowel or colonic dysmotility, constipation, rumination syndrome, swallowing disorders, medication effects, and avoidant/restrictive food intake disorder may also contribute.

A 2022 review focused on nutritional problems in hypermobility disorders cautioned that objective dysmotility is often not systematically confirmed. It recommended avoiding assumptions, reducing iatrogenic harm, reviewing medications, identifying disorders of gut–brain interaction, and using integrated gastroenterology, nutrition, psychology, autonomic, and rehabilitation care when needed. (4)

When is a feeding tube used?

Enteral nutrition delivers nutrition through the gastrointestinal tract. An NJ tube passes through the nose into the jejunum, the upper part of the small intestine. A J-tube is placed directly into the jejunum. These approaches may be used when a patient cannot safely or adequately meet nutritional needs by mouth.

Tube feeding can be medically necessary and lifesaving. Decisions about starting, changing, or removing a tube belong with the patient’s gastroenterologist, dietitian, and nutrition-support team. Adequate oral intake, weight stability, hydration, laboratory findings, swallowing safety, and the underlying gastrointestinal disorder must all be considered.

A clinical report addressing feeding difficulties in EDS emphasized that symptom-driven restriction can sometimes progress rapidly and that there are no universally validated hEDS-specific guidelines for these complex cases. The authors described a multidisciplinary approach intended to optimize oral nutrition and avoid unnecessary escalation while still protecting patients who truly require enteral support. (5)

In Allyson’s case, the video appropriately notes that her dietitian would determine whether tube removal was safe. Feeling better or eating a single meal is not enough to make that decision.

The vagus nerve and digestion

The vagus nerve is the tenth cranial nerve and a major communication pathway between the brain and internal organs. It participates in swallowing, sensation from the gastrointestinal tract, gastric accommodation, digestive secretions, and aspects of stomach and small-intestinal motility. It also helps coordinate parasympathetic—or “rest and digest”—activity.

Vagal signaling is therefore relevant to nausea, early fullness, gastric motility, and gut–brain communication. Our broader discussion of vagus-nerve symptoms and possible cervical relationships explains why digestive complaints may coexist with dizziness, fatigue, swallowing difficulty, heart-rate changes, and other autonomic symptoms. But most digestive symptoms cannot be used as a direct test of vagus-nerve injury. Gastroparesis, for example, may occur with diabetes, after surgery, following infection, because of medications, with neurologic or connective-tissue disorders, or without an identifiable cause.

At Caring Medical, we discuss the vagus nerve’s relationship to digestive symptoms and consider whether cervical structure could be relevant in a selected patient who also has neck pain, abnormal posture, suspected instability, dizziness, orthostatic symptoms, or symptoms that change with head and neck position.

Can ultrasound show vagus-nerve degeneration?

High-resolution ultrasound can visualize the cervical vagus nerve within the carotid sheath and measure its cross-sectional area. At the Hauser Neck Center, this may be incorporated into dynamic vagus-nerve testing when the clinical history suggests that symptoms change with posture, movement, or physiologic stress. A systematic review and meta-analysis of healthy adults calculated a pooled mean vagus-nerve cross-sectional area of approximately 2.2 mm², but technique, measurement level, equipment, and individual anatomy matter. (6)

A smaller-than-reference measurement should not automatically be called “vagus-nerve degeneration.” Ultrasound size is an emerging biomarker studied in several neurologic and autonomic conditions, but it does not by itself establish the cause of a patient’s gastrointestinal symptoms, prove loss of nerve cells, or demonstrate impaired signaling. There is not yet a universally accepted ultrasound threshold that diagnoses clinically meaningful vagal neuropathy in an individual patient with hEDS.

We therefore interpret vagus-nerve ultrasound as one piece of a larger evaluation rather than a stand-alone diagnosis.

Cervical instability 

The vagus nerves travel through the carotid sheaths in the front and sides of the neck, near the cervical spine. We have proposed that, in a subset of patients, ligamentous cervical instability, altered cervical curvature, or forward head posture may produce abnormal mechanical stress around the carotid sheath and interfere with vagus-nerve function.

Ross Hauser, MD, described this proposed condition as cervicovagopathy. Our 2025 paper included a retrospective chart review and a clinical case example relating cervical structural findings, internal jugular vein measurements, vagus-nerve cross-sectional area, and chronic symptoms. (7)

This research gives the hypothesis a published framework, but it does not establish causation. The study was retrospective, involved patients seeking care at a specialized neck center, lacked a randomized untreated control group, and did not demonstrate that cervical treatment reverses gastrointestinal dysmotility or eliminates feeding-tube dependence. Independent replication and prospective controlled trials are needed.

The correct clinical question is therefore not, “Does every patient with hEDS and nausea have vagus-nerve compression?” It is, “Could cervical dysfunction be one relevant contributor in this particular patient after established gastrointestinal, nutritional, neurologic, and autonomic causes have been appropriately evaluated?”

Why cervical curve and stability were addressed in Allyson’s program

In the video, Caring Medical nurse practitioner Demi Foster explains that Allyson had a reversed cervical curve rather than the expected gentle lordosis. The clinic used motion radiographs and ultrasound evaluation through the Hauser Neck Center’s dynamic diagnostic approach and recommended a cervical curve-correction program along with injection treatment.

At Caring Medical, cervical curve correction is intended to improve the way the head and neck are supported and reduce sustained loading of cervical muscles and ligaments. Postural awareness and graded exercise may also improve strength, movement confidence, and general conditioning. When autonomic symptoms are prominent, heart-rate variability testing may provide additional information about cardiac autonomic regulation, although it cannot identify the cause of symptoms by itself.

The relationship between cervical curvature and symptoms is not simple. Many asymptomatic people have straightening or reversal on imaging, and a curve abnormality does not prove instability or vagal impairment. Imaging findings must be correlated with symptoms, physical examination, motion, and other diagnostic information.

Prolotherapy

Prolotherapy is an injection treatment, commonly using a dextrose solution, directed at selected ligament and tendon attachments. The proposed goal is to stimulate a local healing response and improve painful joint stability.

Caring Medical has published narrative and observational work connecting capsular ligament laxity with cervical instability and discussing Prolotherapy as a possible treatment. (8) A small prospective case series from another clinical group also reported changes in pain and cervical translation after fluoroscopically guided Prolotherapy, but the study included only six patients and did not provide controlled evidence. (9)

At present, there are no high-quality randomized trials showing that cervical Prolotherapy treats gastroparesis, restores vagus-nerve function, or enables feeding-tube removal in people with hEDS. Likewise, stem-cell or other orthobiologic injections for this purpose remain investigational. Allyson’s improvement occurred during a program containing several components and over an extended period; the contribution of each component cannot be determined from her testimonial.

Potential risks of cervical injections include pain flare, bleeding, infection, nerve or vascular injury, allergic reaction, and other procedure-specific complications. Cervical treatment requires careful patient selection, anatomical expertise, image guidance when appropriate, and a discussion of alternatives and uncertainty.

A comprehensive evaluation for severe digestive symptoms in hEDS

Before attributing inability to eat to the neck or vagus nerve, evaluation may include:

• Gastroenterology assessment and review of prior testing
• Dietitian evaluation of calorie, protein, fluid, and micronutrient intake
• Medication review
• Testing for mechanical obstruction or swallowing dysfunction when indicated
• Gastric-emptying or other motility studies when appropriate
• Assessment for constipation, pelvic-floor dysfunction, reflux, celiac disease, inflammation, endocrine disorders, and other gastrointestinal diagnoses
• Evaluation for POTS or other dysautonomia when orthostatic symptoms are present
• Consideration of neurologic, metabolic, mast-cell, and psychological contributors based on the individual history
• Review of cervical symptoms and structure when there is a credible neck-related clinical pattern; in selected patients, transcranial and extracranial Doppler ultrasound may be considered to evaluate positional blood-flow questions rather than digestive motility itself

Progressive inability to eat or drink, rapid weight loss, dehydration, vomiting blood, black stools, severe abdominal pain, abdominal distention, fainting, fever, confusion, or signs of tube infection or displacement require prompt medical attention.

Allyson’s account shows that meaningful improvement can occur even after severe functional decline. At the time of the video, she reported that she was eating without using her feeding tube, working, returning to school, walking more, and participating in family life.

Her story does not prove one universal explanation or treatment. Instead, it highlights several practical lessons:

1. Gastrointestinal symptoms in hEDS are common, real, and often multifactorial.
2. POTS and autonomic dysfunction should be considered when digestive symptoms coexist with dizziness, fatigue, and poor standing tolerance.
3. Feeding-tube decisions require gastroenterology and nutrition oversight.
4. Vagus-nerve ultrasound is promising but cannot independently diagnose the cause of gastrointestinal dysfunction.
5. Cervical instability and cervicovagopathy remain possible contributors in selected patients, not established explanations for all cases.
6. Evidence that cervical Prolotherapy reverses dysmotility or removes the need for tube feeding is currently insufficient.
7. Patient-centered, multidisciplinary care offers the best framework for complex cases.

At Caring Medical, our goal is to understand the whole clinical picture while being clear about what is established, what we observe in practice, and what still requires better research.

Medical disclaimer

This article is for educational purposes only and does not establish that the treatments described produced the patient’s reported outcome. Individual results vary. It does not replace evaluation by a gastroenterologist, dietitian, neurologist, autonomic specialist, or other qualified clinician. Patients should never stop tube feeding, alter enteral nutrition, or arrange tube removal without approval from the medical team supervising their nutritional care.

References

1 Thwaites PA, Gibson PR, Burgell RE. Hypermobile Ehlers-Danlos syndrome and disorders of the gastrointestinal tract: What the gastroenterologist needs to know. Journal of Gastroenterology and Hepatology. 2022;37(9):1693–1709. doi:10.1111/jgh.15927. [Google Scholar]
2 Wu W, Ho V. An overview of Ehlers-Danlos syndrome and the link between postural orthostatic tachycardia syndrome and gastrointestinal symptoms with a focus on gastroparesis. Frontiers in Neurology. 2024;15:1379646. doi:10.3389/fneur.2024.1379646. [Google Scholar]
3 Alomari M, Hitawala A, Chadalavada P, et al. Prevalence and predictors of gastrointestinal dysmotility in patients with hypermobile Ehlers-Danlos syndrome: A tertiary care center experience. Cureus. 2020;12(4). doi:10.7759/cureus.7881. [Google Scholar]
4 Fikree A, Chelimsky G, Collins H, et al. Gastrointestinal symptoms and nutritional issues in patients with hypermobility disorders: Assessment, diagnosis and management. Frontline Gastroenterology. 2022;13(6):499–507. doi:10.1136/flgastro-2022-102137. [Google Scholar]
5 Kilgore AL, Hawa JT, Liu E, et al. EDS-related feeding difficulties: Preventing the placement of a surgical feeding tube. JPGN Reports. 2022;3(2). doi:10.1097/PG9.0000000000000178. [Google Scholar]
6 Fisse AL, Katsanos AH, Gold R, Pitarokoili K, Krogias C. Cross-sectional area reference values for peripheral nerve ultrasound in adults: A systematic review and meta-analysis—Part III: Cervical nerve roots and vagal nerve. European Journal of Neurology. 2021;28(7):2319–2326. doi:10.1111/ene.14862. [Google Scholar]
7 Hauser RA, Matias D, Rawlings BR. Cervicovagopathy: Ligamentous cervical instability and dysstructure as a potential etiology for vagus nerve dysfunction in the cause of human symptoms and diseases. Frontiers in Neurology. 2025;16:1572863. doi:10.3389/fneur.2025.1572863. [Google Scholar]
8 Steilen D, Hauser R, Woldin B, Sawyer S. Chronic neck pain: Making the connection between capsular ligament laxity and cervical instability. The Open Orthopaedics Journal. 2014;8:326–345. doi:10.2174/1874325001408010326. [Google Scholar]
9 Centeno CJ, Elliott J, Elkins WL, Freeman M. Fluoroscopically guided cervical Prolotherapy for instability with blinded pre- and post-radiographic reading. Pain Physician. 2005;8(1):67–72. [Google Scholar]