Differentiating Achalasia From Distal Esophageal Spasm

Achalasia and distal oesophageal spasm can both cause difficulty swallowing, chest pain and the sensation that food is sticking behind the breastbone. Their symptoms overlap enough that a clinical history alone is rarely sufficient. The underlying movement disorder, however, is different, and treatment decisions depend on identifying it accurately.

Achalasia involves impaired relaxation of the lower oesophageal sphincter and loss of normal oesophageal peristalsis. Distal oesophageal spasm usually involves premature, poorly coordinated contractions while the lower sphincter relaxes normally. Type III, or spastic, achalasia can complicate the distinction because it combines outflow obstruction with premature contractions.

For patients in Australia, assessment may begin with a general practitioner and referral to a gastroenterologist or upper gastrointestinal surgeon. Access can be rapid in Sydney, Melbourne and Brisbane, while people in regional or remote areas may need telehealth coordination and travel to a tertiary centre. Medicare rebates, private endoscopy fees and hospital cover can differ, so the financial pathway should be clarified before testing.

Symptoms That Overlap

Progressive dysphagia to both liquids and solid food is a classic clue for achalasia. Regurgitation of undigested food, night-time coughing, weight loss and difficulty eating larger meals may develop as food remains in the oesophagus. Some people report chest pressure rather than pain, and symptoms can be mistaken for reflux.

Distal oesophageal spasm more often presents with intermittent swallowing difficulty and chest pain. Episodes may be associated with very hot or cold drinks, rapid eating, stress, or the coffee and alcohol habits common in Australia’s café and social dining culture. These triggers are not diagnostic, and gastro-oesophageal reflux can coexist with either condition.

Unintentional weight loss, anaemia, vomiting, bleeding or rapidly worsening dysphagia requires prompt medical assessment. In an older adult with a short history of symptoms, clinicians must also exclude pseudoachalasia caused by a tumour near the gastro-oesophageal junction.

The Tests That Separate Them

Upper endoscopy is usually performed first to look for cancer, a stricture, reflux injury or retained food. A normal endoscopy does not rule out a motility disorder. During the procedure, the specialist may examine the junction carefully and take biopsies if the appearance is abnormal.

High-resolution oesophageal manometry is the key test. In achalasia, the study shows impaired lower oesophageal sphincter relaxation, measured by an elevated integrated relaxation pressure, together with absent normal peristalsis. Chicago Classification version 4.0 divides achalasia into types I, II and III according to pressurisation and premature contractions.

Distal oesophageal spasm generally has normal junction relaxation and at least 20% premature swallows, with a reduced distal latency. The patient typically retains some normal peristaltic activity. A diagnosis is strongest when the manometry findings match relevant symptoms and other causes have been excluded.

Imaging And Supportive Assessment

A timed barium swallow, also called a timed barium oesophagram, can show delayed emptying, retained contrast and the tapered “bird-beak” appearance associated with achalasia. It also provides a practical baseline for judging response after treatment. In spasm, the outline may be normal between episodes or show a corkscrew pattern, but that sign is neither consistent nor essential.

EndoFLIP measures the distensibility of the gastro-oesophageal junction during endoscopy. It can support a diagnosis of impaired opening when manometry is inconclusive, particularly in suspected early or spastic achalasia. The test should complement, rather than replace, a full clinical assessment.

A barium study and endoscopy are especially useful when symptoms and manometry do not align. Retained food, severe oesophageal enlargement or poor emptying favours achalasia, whereas normal transit with episodic contractions makes distal spasm more plausible.

Why The Distinction Changes Treatment

Achalasia treatment aims to reduce resistance at the lower oesophageal sphincter. Options include pneumatic balloon dilation, laparoscopic Heller myotomy and peroral endoscopic myotomy, or POEM. Botulinum toxin injection may be considered for people who are frail or unsuitable for more durable procedures. Type III achalasia often requires a longer myotomy because the abnormal contractions extend higher into the oesophagus.

Distal oesophageal spasm is commonly managed with an individualised combination of reflux treatment, dietary adjustments and medicines that relax smooth muscle. Calcium-channel blockers or nitrates may be considered, although side effects and variable benefit limit their use. Selected patients with persistent, confirmed spastic disease may be assessed for botulinum toxin or POEM.

The Australian Therapeutic Goods Administration regulates medicines and medical devices, but availability does not mean a treatment is suitable for every patient. A gastroenterologist should interpret the physiology alongside age, general health, aspiration risk, reflux risk and local procedural expertise.

Practical Points For An Australian Assessment

People seeking care through the public system may receive Medicare-supported consultations and investigations, although eligibility, waiting times and out-of-pocket costs vary. Private hospitals in Melbourne, Sydney and other major centres may offer faster access, but specialist, anaesthetic and facility fees can exceed private health insurance benefits. Rural patients may need coordinated referrals through a regional hospital.

Useful information to record includes the following:

• Whether food sticks with liquids, solids or both
• The duration, frequency and triggers of chest pain or swallowing difficulty
• Regurgitation, night cough, aspiration, weight loss or reduced food intake
• Previous endoscopy, barium studies, reflux treatment and relevant scan results
• Medicines, smoking history and any family or personal history of upper gastrointestinal cancer

The central practical distinction is simple: achalasia is an oesophageal emptying disorder with impaired junction relaxation and absent normal peristalsis, while distal oesophageal spasm has premature contractions with generally preserved relaxation. Endoscopy, high-resolution manometry and, when needed, timed barium imaging provide the most reliable route to the correct diagnosis and treatment plan.