The term "occurrence" refers to the happening or existence of something, especially in relation to a specific event or situation.
Comorbidity: Comorbidity is when two or more disorders occur simultaneously in the same individual.
Dual diagnosis: Dual diagnosis refers to the coexistence of both a mental health disorder and a substance use disorder.
Multimorbidity: Multimorbidity describes the presence of two or more chronic medical conditions in an individual.