The unusual has such mundane covers.  What diseases had been caused not by intrinsic physiological failures but by mechanisms is left to play free under those mundane covers in the darks between the minds of men?  Unexplained causes are of the unknown yet not unknowable, for where there is a cause beside intrinsic failure there are sources.  Recovering the sources, not a matter of pun, remains a primary task in the search by medicine to renew and rejuvenate the human body and mind.  Medicine is an intermediary layer of intervention because it does not presuppose absolute knowledge but collects the facts through investigation of any means in full sight of the final objective, the perfection through care of the body and mind.  That sources sometimes can be human nature, attributable not to the individual afflicted but some others somehow affiliated albeit uninvited cast question upon the word intervention.  The doctor cannot help but glance for closer inspection beyond the mere symptoms but too the root cause.  He must hold in mind always the final goal of human well being of the patient.  The references in the billions of volumes in the annals are varied and full of suggestions, with the true insights floating in the gossamer of memories and inspiration.  From the terrible ailments, the soft and hard procedures of treatment, self treatment, and miraculous healing nothing is known except what was recorded previously or now observed.  Despite all promises of healing, so much depends on non-intervention of the external party, doctor, nurse, mid-wife, surgeon, etc, and the natural abilities of the body to heal and recover.  

a lake through morning mist