It is abnormally high blood pressure within the skull

An idiopathic condition is a real condition with no known medical explanation.

This is not to be mixed up with psychosomatic conditions, with the patient creating the condition.

these are misnomers actually,when there is no evident cause of hypertension then it is called idiopathic/benign/primary/unspecified hypertension.

http://treathypertension.blogspot.com/

dr Daniel jame gray.

Some common causes are: Sleep apnea

Emphysema Some people develop pulmonary hypertension without there being an obvious cause. This is called Idiopathic Pulmonary Hypertension.