tweety_fan wrote:
here's a definition of disease:
1. a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors; illness; sickness; ailment.
2.any abnormal condition in a plant that interferes with its vital physiological processes, caused by pathogenic microorganisms, parasites, unfavorable environmental, genetic, or nutritional factors, etc.
3.any harmful, depraved, or morbid condition, as of the mind or society: His fascination with executions is a disease.
4.decomposition of a material under special circumstances: tin disease.
the word gives the impression that something is contagious.
Not only does "disease" imply that something is contagious (although there are both infectious and contagious diseases), but it also implies that the condition affects the physical health of a person, rather than their mental health. Therefore, I would not consider mental illnesses diseases. Autism should especially be excluded from this label, as it's more a different way of thinking that a mental impairment.