Difficulty Swallowing: What Could Be Causing It?

What Exactly Is Dysphagia?

Dysphagia is not a single disease. It is a symptom, defined as the sensation that food or liquid is not moving normally from the mouth to the stomach. A 2019 systematic review published in The Lancet Gastroenterology and Hepatology estimated that dysphagia affects approximately 8 to 22% of community-dwelling adults over age 50, with prevalence rising sharply in patients who have had a stroke or who carry a diagnosis of Parkinson's disease [1].

Clinicians divide the problem into two categories based on anatomy. Oropharyngeal dysphagia originates at or above the upper esophageal sphincter and usually presents as coughing, choking, or nasal regurgitation immediately at the start of a swallow. Esophageal dysphagia begins below the sphincter and typically produces a sensation of food sticking in the chest seconds after swallowing.

Getting this distinction right matters. The causes, workup, and treatments differ substantially between the two types, and missing an esophageal malignancy costs lives.

How Swallowing Actually Works

A normal swallow involves more than 30 paired muscles coordinated by brainstem nuclei, the vagus nerve (CN X), the glossopharyngeal nerve (CN IX), and the hypoglossal nerve (CN XII). The oral phase moves a bolus to the pharynx. The pharyngeal phase closes the airway and opens the upper esophageal sphincter. The esophageal phase propels the bolus through coordinated peristalsis to the lower esophageal sphincter (LES).

Disruption at any of these three phases produces a distinct symptom pattern that guides the diagnostic evaluation.

Oropharyngeal Causes of Difficulty Swallowing

Oropharyngeal dysphagia accounts for roughly one-third of all dysphagia referrals [2]. The underlying problems are usually neurological, structural, or both.

Stroke and Other Neurological Disorders

Stroke is the single most common neurological cause. A meta-analysis in PLOS ONE (2014) examining 24 studies found that 37 to 78% of acute stroke patients exhibit dysphagia in the first 72 hours [3]. Most recover partial function within weeks, but 11 to 50% still have clinically significant swallowing dysfunction at six months.

Parkinson's disease affects the pharyngeal and esophageal phases simultaneously. A study in Neurology (2018) reported that 82% of Parkinson's patients show videofluoroscopic evidence of swallowing abnormality even when they deny symptoms [4]. Reduced tongue control, delayed swallow initiation, and poor LES relaxation all contribute.

Multiple sclerosis, amyotrophic lateral sclerosis (ALS), and myasthenia gravis can each impair the bulbar musculature. ALS in particular tends to produce early, relentless oropharyngeal dysphagia as lower motor neurons degenerate.

Structural Pharyngeal Causes

A Zenker's diverticulum, a posterior pharyngeal pouch that traps food above the upper esophageal sphincter, typically presents in patients over 60 with regurgitation of undigested food hours after eating. Head-and-neck cancers, post-radiation fibrosis, and cervical osteophytes compressing the posterior pharynx are additional structural contributors that require direct visualization to diagnose.

Esophageal Causes of Difficulty Swallowing

Gastroesophageal Reflux Disease and Peptic Stricture

GERD is the most prevalent cause of esophageal dysphagia in Western countries. Chronic acid exposure inflames and then scars the distal esophagus. When scar tissue narrows the lumen to below roughly 13 mm, a peptic stricture forms and solid food begins to stick. The ACG Clinical Guideline on GERD (2022) states: "Patients with peptic strictures should be treated with proton pump inhibitor (PPI) therapy indefinitely after dilation to reduce recurrence rates" [5].

Patients typically describe intermittent solid-food dysphagia, heartburn, and regurgitation. Endoscopic dilation with a bougie or balloon catheter resolves the obstruction in most cases, though 20 to 30% need repeat dilation within 12 months.

Eosinophilic Esophagitis

Eosinophilic esophagitis (EoE) is now recognized as the leading cause of food impaction in adults under age 40 [6]. The 2022 ACG EoE guideline defines the condition as a chronic, antigen-mediated disease characterized by symptoms of esophageal dysfunction and histologic findings of 15 or more eosinophils per high-power field on esophageal biopsy [7].

EoE produces a classic triad: dysphagia to solids, food impaction, and chest pain not relieved by antacids. Endoscopy reveals rings, furrows, and whitish plaques. First-line therapies include swallowed topical corticosteroids (budesonide oral suspension 2 mg twice daily is FDA-approved since 2022), elimination diets targeting the six-food protocol, or PPI therapy, which resolves histologic eosinophilia in roughly 33 to 40% of patients [8].

Esophageal Motility Disorders

Motility disorders involve abnormal peristalsis or impaired LES function rather than a structural blockage. Achalasia is the best-defined example: the LES fails to relax and esophageal peristalsis is absent, trapping both liquids and solids. Dysphagia to both liquids and solids from the outset strongly suggests a motility disorder rather than a mechanical obstruction (which typically begins with solids alone).

High-resolution esophageal manometry is the gold standard for diagnosing achalasia. The Chicago Classification v4.0 (2021) subdivides achalasia into three types based on pressurization patterns, with Type II having the best response to pneumatic dilation (90% symptom relief at one year) [9].

Diffuse esophageal spasm (DES) and hypercontractile esophagus (Jackhammer esophagus) cause intermittent dysphagia plus severe, non-cardiac chest pain. Calcium channel blockers, phosphodiesterase-5 inhibitors, and tricyclic antidepressants are used with modest evidence; a 2020 review in Gastroenterology found that per-oral endoscopic myotomy (POEM) achieved symptom relief in 72% of DES patients at 12-month follow-up [10].

Esophageal Cancer

Esophageal cancer demands urgent consideration whenever dysphagia is progressive, starts with solids and rapidly extends to liquids, and accompanies weight loss greater than 5% of body weight. The American Cancer Society estimated 22,370 new cases of esophageal cancer in the United States in 2024 [11]. Two histologic types predominate: squamous cell carcinoma (risk factors: tobacco, alcohol, achalasia) and adenocarcinoma (risk factors: GERD, Barrett's esophagus, obesity).

Patients with Barrett's esophagus have a 0.1 to 0.5% annual risk of progression to adenocarcinoma; endoscopic surveillance every 3 to 5 years is recommended by the ACG for non-dysplastic Barrett's esophagus [12].

Pill-Induced Esophagitis and Other Causes

Several medications directly injure the esophageal mucosa when they lodge against it. Doxycycline, bisphosphonates (alendronate), potassium chloride tablets, and NSAIDs are the most common offenders. The injury typically produces acute, severe odynophagia (painful swallowing) and retrosternal chest pain appearing days after starting the medication. Taking pills with a full 240 mL glass of water and remaining upright for 30 minutes afterward reduces injury risk substantially.

Lichen planus of the esophagus, systemic sclerosis (scleroderma) with aperistalsis, and post-surgical changes after anti-reflux procedures or neck surgery round out the differential in less common presentations.

Red-Flag Symptoms That Need Same-Day Evaluation

Not every case of difficulty swallowing is a medical emergency, but certain combinations demand immediate attention. The British Society of Gastroenterology (BSG) 2021 guidelines specify that the following features should prompt urgent (within two weeks) upper GI endoscopy, with same-day evaluation if the patient is acutely unwell [13]:

• Progressive dysphagia to solids over weeks to months
• Unintentional weight loss of 5% or more in six months
• Dysphagia accompanied by hematemesis or melena
• Hoarseness plus dysphagia (suggesting recurrent laryngeal nerve involvement by tumor)
• A palpable neck or supraclavicular lymph node
• New-onset dysphagia in anyone over age 55 with no prior esophageal history

Sudden dysphagia with facial droop, arm weakness, or slurred speech is a stroke until proven otherwise. Call emergency services immediately.

How Dysphagia Is Diagnosed

History and Physical Examination

The diagnostic workup starts with a focused history. Clinicians ask whether the difficulty is with solids, liquids, or both; whether it appeared suddenly or gradually; and whether it is intermittent or constant. Solid-food dysphagia that progresses to liquids over weeks suggests mechanical obstruction. Dysphagia to both solids and liquids from the first episode points toward a motility disorder or a neuromuscular cause.

Physical examination assesses cranial nerve function (gag reflex, palate movement, tongue strength), voice quality (wet or hoarse voice suggests aspiration or a laryngeal lesion), and lymph node status.

Barium Swallow and Videofluoroscopic Swallow Study

A modified barium swallow study (MBSS) is the standard imaging test for oropharyngeal dysphagia. It records real-time pharyngeal and esophageal mechanics in multiple planes and detects aspiration that patients may not feel. A full barium esophagram also identifies strictures, rings, webs, diverticula, and mucosal irregularities in the esophagus.

Upper Endoscopy

Esophagogastroduodenoscopy (EGD) is both diagnostic and, when a dilation is needed, therapeutic. Biopsies taken during EGD can diagnose EoE, Barrett's esophagus, esophagitis, and malignancy. For any patient with progressive solid-food dysphagia over age 40, EGD is the first-line test rather than barium radiography because it allows simultaneous biopsy and intervention.

High-Resolution Esophageal Manometry

High-resolution manometry (HRM) with esophageal pressure topography is the gold standard for diagnosing motility disorders when EGD and barium swallow are unrevealing. The Chicago Classification v4.0 uses 22 pressure sensors to characterize LES relaxation, peristaltic vigor, and pressurization patterns [9]. HRM is essential before surgical or endoscopic myotomy to confirm achalasia subtype.

Additional Testing

Esophageal pH-impedance monitoring quantifies acid and non-acid reflux episodes when GERD-driven dysphagia is suspected but not confirmed by EGD. CT of the chest and neck is indicated when extrinsic compression (mediastinal mass, aortic aneurysm, vascular ring) is on the differential or to stage a known esophageal malignancy.

Treatment Options for Difficulty Swallowing

Treatment depends entirely on the underlying cause. There is no single drug or procedure that addresses dysphagia broadly.

Acid Suppression for GERD and Peptic Strictures

PPIs are the foundation of treatment for GERD-related dysphagia. Omeprazole 20 to 40 mg daily, lansoprazole 30 mg daily, or equivalent PPIs taken 30 to 60 minutes before the first meal of the day heal reflux esophagitis in 80 to 90% of patients at eight weeks [14]. For peptic strictures, endoscopic dilation is combined with long-term PPI therapy to prevent recurrence.

Dietary Elimination and Steroids for EoE

The six-food elimination diet (removing milk, wheat, eggs, soy, nuts, and seafood) induces histologic remission in approximately 72% of EoE patients at six weeks, though identifying the specific trigger requires sequential reintroduction [8]. Swallowed budesonide oral suspension (Eohilia, 2 mg twice daily) received FDA approval in February 2023 for adults and adolescents aged 11 and older, achieving histologic remission in 53% of patients versus 1% with placebo in the key TRAMPOLINE trial [15].

Pneumatic Dilation and POEM for Achalasia

Pneumatic dilation (PD) using a 30 to 35 mm balloon is first-line therapy for Type I and Type II achalasia. A randomized trial published in Gut (2011, N=201) found that PD and laparoscopic Heller myotomy (LHM) produced similar symptom relief at two years (86% vs. 90%, P=0.46) [16]. POEM has emerged as a less invasive alternative, with a 2019 randomized trial in NEJM (N=221) demonstrating POEM superior to PD at two-year follow-up (83% vs. 78% success rate, P<0.001) [17].

Speech Therapy and Swallowing Rehabilitation

For oropharyngeal dysphagia caused by stroke or Parkinson's disease, speech-language pathology (SLP) intervention is the primary treatment. Techniques include the Mendelsohn maneuver, effortful swallow, Shaker head-lift exercises, and compensatory strategies such as chin-tuck posture. A Cochrane review (2018) of 41 trials found that swallowing therapy reduced aspiration rates and improved functional swallowing outcomes in post-stroke patients, with the strongest evidence for exercise-based rehabilitation [18].

Diet texture modification using the IDDSI (International Dysphagia Diet Standardisation Initiative) framework reduces aspiration pneumonia risk in nursing-home residents with oropharyngeal dysphagia. Thickened liquids (IDDSI Level 3 or 4) decrease aspiration events detected on MBSS, though the THICCC trial showed no mortality benefit over standard liquids at 12 months (hazard ratio 0.91, 95% CI 0.74 to 1.11) [19].

Surgical and Endoscopic Interventions

Zenker's diverticulotomy is performed endoscopically or via open surgery and resolves dysphagia in over 90% of patients with recurrence rates below 10% at five years [20]. Esophageal cancer treatment depends on stage: early T1 tumors may be cured by endoscopic submucosal dissection, while locally advanced disease requires chemoradiotherapy (cisplatin plus 5-fluorouracil or FOLFOX) followed by surgical resection or definitive chemoradiation per NCCN guidelines.

When to See a Doctor

Mild, intermittent dysphagia after eating too quickly, swallowing a large pill, or during a respiratory infection can be monitored briefly. Any of the following presentations should prompt a call to a clinician within 24 to 48 hours or, in emergencies, an immediate visit to the emergency department:

• Dysphagia with weight loss, even mild
• Inability to swallow saliva or liquids
• Recurrent aspiration pneumonia
• Dysphagia that has been present for more than three weeks without a clear trigger
• Any of the red-flag features listed in the section above

Waiting more than four to six weeks to investigate progressive solid-food dysphagia in an adult over 50 means accepting a real risk of delayed cancer diagnosis.