Any process that increases blood-brain barrier permeability, the quality of the blood-brain barrier that allows for a controlled passage of substances (e.g. macromolecules, small molecules, ions) into and out of the brain.
Synonyms:
exact_synonym:
positive regulation of BBB permeability; up-regulation of BBB permeability; up-regulation of blood-brain barrier permeability; upregulation of BBB permeability; upregulation of blood-brain barrier permeability
narrow_synonym:
activation of maintenance of permeability of BBB; activation of maintenance of permeability of blood-brain barrier