Achalasia, familial esophageal is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Achalasia, familial esophageal, or a subtype of Achalasia, familial esophageal, affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Achalasia, familial esophageal as a "rare disease". More information about Achalasia, familial esophageal is available from Orphanet
The term 'prevalence' of Achalasia, familial esophageal usually refers to the estimated population of people who are managing Achalasia, familial esophageal at any given time. The term 'incidence' of Achalasia, familial esophageal refers to the annual diagnosis rate, or the number of new cases of Achalasia, familial esophageal diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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