My favorite is "idiopathic", but "cryptogenic" is also correct.
Alopecia areata.
In Situ
Origin.originOriginorigin
The medical term for something of cardiac origin is "cardiac." This refers to any condition or symptom that originates from the heart.
Psychogenic means of mental origin or causation
Proximal means nearer the point of origin.
The insertion is the end of the muscle. The origin is the beginning.
Epidemiology
Etomology
The term used in forensics to describe a sample of unknown origin is "questioned sample."
Syncope is the medical term meaning fainting.
Anacusis is the medical term meaning complete deafness.