The phrase "characteristic symptoms" refers to the specific signs or experiences that are typically associated with a particular condition or illness. These symptoms help identify and distinguish the condition from others. Full definition
Infections with this fungus show very characteristic symptoms including nasal discharge. (lowchensaustralia.com)
A traumatic event is defined as «the development of characteristic symptoms following exposure to one or more traumatic events.» (solaceformothers.org)
And certain characteristic symptoms of the syndrome went unmentioned in Lu's report. (sciencenews.org)