Idiopathic
From http://en.wiktionary.org
AdjectiveidiopathicLou Gehrig's disease is a progressive neurological disease. It is also known as amyotrophic lateral sclerosis. The cause of Lou Gehrig's disease is not known, as of July 2014.
Microorganisms that cause disease are known as pathogens, such as bacteria, viruses and fungi.
if the physician diagnoses a disease that has no known cause,it is called
No there is no known connection. The cause for arthritis is as yet not known.
Almost all microorganism can cause disease.those which cause disease are known as Pathogens.
Those factors are known as risk factors for the disease. Risk factors are characteristics or behaviors that are associated with an increased likelihood of developing a particular disease but may not necessarily cause the disease on their own.
This can cause the well known disease cancer.
it is a disease cause by virusesit is a disease cause by virusesit is a disease cause by viruses
etiology is the study of the origin of diseases.
Pathogens.
a vector
Spinocerebellar Degeneration Disease has no known cause. Neither a source. :)