Kind of block or health (6)
I believe the answer is:
mental
I believe this is a double definition.
'kind of block' is the first definition.
(I've seen this in another clue)
'health' is the second definition.
(thesaurus)
(Other definitions for mental that I've seen before include "Crazy" , "Involving the mind" , "Cerebral" , "Intellectual" , "Done in the mind" .)