Which are the causes of Achalasia?

Achalasia is a rare esophageal motility disorder caused by the progressive loss of nerve cells (ganglion cells) in the esophagus, which prevents the lower esophageal sphincter from relaxing properly. While the exact underlying trigger remains largely unknown, current research points toward a complex interplay between autoimmune responses, latent viral infections, and a potential genetic predisposition.

What causes the nerve damage in Achalasia?

The primary mechanism of Achalasia is the degeneration of the myenteric plexus, the "nerve network" responsible for coordinating esophageal muscle contractions. Think of these nerves as the wiring of a doorway; when they are damaged, the door (the lower esophageal sphincter) fails to open when food approaches. Researchers believe this damage may be caused by an immune-mediated process where the body’s own defense system mistakenly attacks these nerve cells, possibly triggered by an earlier viral infection in genetically susceptible individuals.

Is Achalasia considered a hereditary condition?

While Achalasia is generally not considered a classic inherited genetic disease, there is evidence of familial clustering in rare cases. Genetic research is ongoing to identify susceptibility markers, though most individuals diagnosed with Achalasia do not have a family history of the condition. Current studies are investigating potential associations with specific HLA (Human Leukocyte Antigen) genes, which regulate the immune system.

What are the suspected risk factors and triggers?

Distinguishing between direct causes and risk factors is vital. A "cause" is the direct mechanism of nerve loss, while "risk factors" are conditions that may predispose an individual. Key research areas include:

• Autoimmune reaction: Chronic inflammation targeting the inhibitory neurons.


• Viral infections: Potential links to herpes simplex or human papillomavirus, which may act as environmental "triggers."


• Neurological degeneration: Similarities to other neurodegenerative processes where specific cell populations are lost over time.

What does current research tell us about the etiology?

The etiology of Achalasia is still under active investigation. Researchers at institutions worldwide are currently using advanced genomic sequencing and immunological profiling to better understand why the body initiates this specific attack on the esophagus. With 319 people with Achalasia currently sharing their experiences on DiseaseMaps.org, the collective data helps researchers better identify patterns in disease onset and symptom progression.

Next steps

• Consult a gastroenterologist specializing in esophageal motility disorders for a manometry study.


• Join the Achalasia community at DiseaseMaps.org to connect with others and share experiences.


• Discuss current clinical trials related to esophageal nerve regeneration or immune modulation with your physician.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Achalasia.


• Orphanet: Achalasia (ORPHA:182064).


• Online Mendelian Inheritance in Man (OMIM): #200400 (Achalasia).


• International Society for Diseases of the Esophagus (ISDE).