a disease in which there is an abnormal change in the function of an organ, but no structural alteration in the tissues involved (opposed to organic disease).
Origin
1870-75
Examples from the web for functional disease
Identification of functional disease and vulnerability markers for diagnosing disease would be helpful.
British Dictionary definitions for functional disease
functional disease
noun
1.
a disease in which there is no observable change in the structure of an organ or part Compare organic disease