<unk>  refers to the state of functionality prior to the onset of a disease or illness. It is most often used in relation to psychological function (e.g. premorbid personality or premorbid intelligence), but can also be used in relation to other medical conditions (e.g. premorbid lung function or premorbid heart rate).
Premorbidity
Multimorbidity
Comorbidity
Natural history of disease
Family history 
Risk factor
Genetic predisposition
Polypharmacy