The phrase "illness onset" refers to when a person starts to feel or show the first signs or symptoms of a sickness or disease. It marks the beginning of being unwell. Full definition
The incidence of new chronic illness onset increased over time as well, with more husbands than wives developing serious health problems. (sciencedaily.com)
They also examined the effects of commonly used prescription medications, age of illness onset, history of psychosis, mood state, age and sex differences on cortical regions. (sciencedaily.com)
BACKGROUND Schizophrenia is associated with cortical thickness reductions in the brain, but it is unclear whether these are present before illness onset, and to what extent they are driven by genetic (semanticscholar.org)