IT'S CALLED AN EXACERBATION.

It is amazing how many people with MS refer to them as exasperations…It shocks me and causes me to make a face every time I read it. Learn it. Know it. Live it. Please.

exacerbation (usually uncountable, plural exacerbations)

Noun

1. An increase in the severity of something (such as a disease)

ex·as·per·a·tion

igˌzaspəˈrāSHən/

noun

1. 1.

   a feeling of intense irritation or annoyance.

   "she rolled her eyes in exasperation"

   synonyms:

   irritation, annoyance, vexation, anger, fury, rage,ill humor, crossness, testiness, tetchiness