Question

which type of disease produces symptoms for which no physiological or anatomical cause can be identified?

Answer 1

Answer:

This would be in the "genetic disorder" category.

Explanation:

The doctor will find no medical cause or scientific explanation.  In the area of medicine, this is known also as MUS - medically unexplained symptom.

Remember that this does not mean that the person is faking or that is all in their head because this is real to them.  It can affect their ability to function and live a regular joe life.