In a book I am reading by Martin L. Budd: Low Blood Sugar (Hypoglycemia) the 20th Century Epidemic?; he defines a disease entity as a condition producing symptoms. (page 23)
The book argues that hypoglycemia is a disease entity that exist in non-diabetics and that this disease has many detrimental effects on health. The main cause of this disease according to him, is a combination of a genetic make up and the diet we eat.
I do not agree with the definition he has for ‘disease.’ I think that ‘disease’ should be defined based on the cause and not the manifestations of a condition. Having said that, defining a disease by the collection of symptoms produced is an excellent starting point. It is the definition I have been searching for to describe the symptoms produced by having excess amount of stool in the large bowel that is relived by passing it, when the symptoms do not fit with any agreed on description of constipation or IBS.