prodromal stage

https://doi.org/10.1351/goldbook.12019
Phase before the onset of full-blown disease.
Note: Often referring to visual disturbances and (or) mood changes before the further development of a migraine headache or epileptic seizure.
See also: prodrome
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 898 [Terms] [Paper]