How Should Unexplained Dysphagia Be Evaluated?

Dysphagia should be localized before it is investigated. The key first distinction is between oropharyngeal dysphagia, in which transfer from mouth to proximal esophagus is impaired, and esophageal dysphagia, in which the patient senses food or liquid sticking after the swallow has begun. Once esophageal dysphagia is suspected, the next question is whether a structural or inflammatory lesion is likely, or whether the problem reflects esophageal motor function. Upper endoscopy usually comes before physiologic testing because malignancy, stricture, eosinophilic esophagitis and other mucosal or structural disease must be identified or excluded.

Step 1: localize the symptom

Oropharyngeal dysphagia often presents with difficulty initiating a swallow, coughing, choking, nasal regurgitation, aspiration or a “wet” voice. Neurologic disease, neuromuscular disorders, structural pharyngeal disease and age-related swallowing dysfunction are common causes. These patients may need speech-language pathology assessment, videofluoroscopic swallow study or fiberoptic endoscopic evaluation of swallowing rather than an esophageal manometry-first pathway.

Esophageal dysphagia is usually described as food or liquid sticking in the chest or lower neck after swallowing. Patients are not always accurate in localizing the site of an esophageal obstruction, so a sensation felt in the neck can still originate distally.

Step 2: use the solids-versus-liquids history as a clue

Dysphagia mainly to solids raises suspicion for a structural narrowing such as peptic stricture, Schatzki ring, malignancy or fibrostenotic eosinophilic esophagitis. Dysphagia to both solids and liquids from the outset raises suspicion for a motility disorder such as achalasia. These patterns are useful but not absolute. Patients with advanced strictures may eventually struggle with liquids, and patients with motility disorders may describe solids as more troublesome.

Intermittent food impaction, atopy and adaptive eating behaviors should raise suspicion for eosinophilic esophagitis (EoE). Patients may not volunteer dysphagia because they have learned to eat slowly, chew excessively, avoid meat or bread, drink fluid with every bite, or leave the table late. The 2025 ACG guideline emphasizes EoE as a chronic immune-mediated disease requiring assessment of both inflammatory activity and fibrostenotic remodeling.

Step 3: identify alarm features

Progressive dysphagia, weight loss, anemia, gastrointestinal bleeding, persistent vomiting, older age at new presentation, rapidly worsening symptoms or a history of cancer should accelerate endoscopic assessment. Acute inability to handle secretions after food impaction is an endoscopic emergency.

The presence of reflux symptoms does not justify assuming that dysphagia is “just GERD.” The ACG GERD guideline considers dysphagia an alarm symptom for which endoscopy is appropriate. Empiric acid suppression has a role in selected reflux presentations, but unexplained dysphagia requires structural assessment.

Step 4: perform high-quality upper endoscopy

Upper endoscopy evaluates mucosal disease and mechanical narrowing and allows biopsy and therapy. The examination should assess for cancer, peptic stricture, rings, webs, candidiasis, erosive disease, Barrett-associated lesions, EoE features and extrinsic compression clues. A benign-appearing narrowing can often be dilated when appropriate, but suspicious strictures require careful biopsy and oncologic evaluation.

EoE deserves special attention because the mucosa can be subtle or occasionally near-normal. In a patient with compatible symptoms, esophageal biopsies should be obtained even if classic endoscopic findings are absent. The 2025 ACG EoE guideline defines the disease using symptoms of esophageal dysfunction together with an eosinophil-predominant infiltrate and recommends ongoing clinical, endoscopic and histologic assessment after treatment.

Step 5: what if endoscopy does not explain the dysphagia?

This is where esophageal physiologic testing becomes central. ACG guidance recommends high-resolution manometry (HRM) for obstructive esophageal symptoms when no mechanical cause has been identified. HRM measures esophagogastric junction relaxation and esophageal body contraction and is the reference test for achalasia and other major motor disorders.

Chicago Classification version 4.0 refined the interpretation of HRM by requiring a more standardized protocol, incorporating supine and upright positions and provocative maneuvers, and emphasizing that some manometric patterns should be considered clinically meaningful only when symptoms and supportive testing agree. This is particularly important for esophagogastric junction outflow obstruction, where an elevated integrated relaxation pressure alone should not automatically trigger irreversible therapy.

Step 6: use supportive tests when the manometry is equivocal

Timed barium esophagram can quantify esophageal emptying and is particularly useful when achalasia or esophagogastric junction obstruction is suspected. Adding a barium tablet can improve detection of subtle obstructive lesions. Barium imaging can also define diverticula, a markedly dilated esophagus or anatomy that may be incompletely appreciated endoscopically.

Functional lumen imaging probe (FLIP) measures distensibility and cross-sectional area across the esophagogastric junction during sedated endoscopy. It can complement HRM when symptoms strongly suggest outflow obstruction but manometry is borderline or incomplete. It should be interpreted as part of the whole clinical picture rather than as an isolated number.

Step 7: distinguish achalasia from mimics

Achalasia is characterized by impaired esophagogastric junction relaxation and absent or abnormal peristalsis. Chicago Classification v4.0 recognizes types I, II and III based on manometric pattern. Type II, with panesophageal pressurization, often responds well to established achalasia therapies; type III contains premature/spastic contractions and may favor a longer myotomy when peroral endoscopic myotomy is chosen.

Pseudoachalasia must be considered when the presentation is atypical, rapidly progressive, associated with substantial weight loss or occurs in an older patient. Malignancy at the gastroesophageal junction can mimic achalasia. Careful endoscopy, cross-sectional imaging and/or endoscopic ultrasound may be needed when suspicion persists.

Step 8: do not overdiagnose minor motor findings

One advantage of Chicago Classification v4.0 is greater discipline around clinically relevant diagnoses. Ineffective esophageal motility now requires a more stringent pattern than in earlier classifications, and supportive evidence can be useful when the study is inconclusive. A manometric label should explain the patient's symptoms before it becomes the focus of treatment.

A practical algorithm

• First distinguish oropharyngeal from esophageal dysphagia.
• Use solids versus liquids, progression, food impaction and atopic history to estimate structural, inflammatory and motor probabilities.
• Treat progressive dysphagia, weight loss, bleeding, anemia or acute food impaction as alarm features.
• Perform upper endoscopy first for unexplained esophageal dysphagia, with biopsies when EoE is plausible.
• If no mechanical cause is found, use high-resolution manometry to evaluate achalasia and other motor disorders.
• Use timed barium esophagram and/or FLIP when outflow obstruction remains uncertain or supportive evidence is needed.
• Always ask whether the physiologic diagnosis actually explains the clinical symptom before treating it.

Common errors to avoid

The first is attributing dysphagia to reflux without endoscopy. The second is failing to biopsy for EoE because the mucosa “looks normal.” The third is diagnosing esophagogastric junction outflow obstruction from a single elevated manometric metric without symptoms or confirmatory evidence. The fourth is forgetting pseudoachalasia in a rapidly progressive presentation.

What should trainees remember?

Dysphagia is a localization problem followed by a mechanism problem. Localize the swallow disorder, exclude structural and inflammatory disease, then measure physiology. Endoscopy and manometry answer different questions and should not be treated as interchangeable tests.

For practising gastroenterologists, the contemporary shift is toward integrated physiology: HRM interpreted with symptoms, provocative maneuvers, timed barium studies and FLIP when needed. This reduces the risk of treating manometric observations that are not clinically meaningful.

Free further reading from Dr. Alan B. R. Thomson

Dr. Thomson's Practice Review in Gastroenterology and Mastering the Boards and Clinical Examinations in Internal Medicine: Gastroenterology provide detailed approaches to dysphagia, motility disorders and examination reasoning and are freely downloadable at GIandHepatology.com.

Frequently asked questions

What is the first test for unexplained esophageal dysphagia?

Upper endoscopy is usually the first test because it can identify structural and mucosal disease and allows biopsy and therapy.

When is esophageal manometry indicated?

High-resolution manometry is most useful when dysphagia persists and endoscopy has not identified a mechanical explanation.

Can eosinophilic esophagitis be present with a normal-looking esophagus?

Yes. Compatible symptoms can justify esophageal biopsies even when classic endoscopic features are absent.

What is the role of FLIP?

FLIP can provide supportive information about esophagogastric junction distensibility, especially when manometry is borderline or incomplete.

References

1. Thomson ABR. Practice Review in Gastroenterology. CAPstone Academic Publishers; 2014. ISBN 978-1500855321.

2. Thomson ABR. Mastering the Boards and Clinical Examinations in Internal Medicine: Gastroenterology. CAPstone Academic Publishers; 2016. ISBN 978-1515386636.

3. Gyawali CP, Carlson DA, Chen JW, Patel A, Wong RJ, Yadlapati RH. ACG Clinical Guidelines: Clinical Use of Esophageal Physiologic Testing. Am J Gastroenterol. 2020;115(9):1412-1428. doi:10.14309/ajg.0000000000000734.

4. Yadlapati R, Kahrilas PJ, Fox MR, et al. Esophageal motility disorders on high-resolution manometry: Chicago Classification version 4.0. Neurogastroenterol Motil. 2021;33(1):e14058. doi:10.1111/nmo.14058.

5. Katz PO, Dunbar KB, Schnoll-Sussman FH, Greer KB, Yadlapati R, Spechler SJ. ACG Clinical Guideline for the Diagnosis and Management of Gastroesophageal Reflux Disease. Am J Gastroenterol. 2022;117(1):27-56. doi:10.14309/ajg.0000000000001538.

6. Dellon ES, Muir AB, Katzka DA, et al. ACG Clinical Guideline: Diagnosis and Management of Eosinophilic Esophagitis. Am J Gastroenterol. 2025;120(1):31-59. doi:10.14309/ajg.0000000000003194.