<unk>  is the process by which a disease or disorder develops. It can include factors which contribute not only to the onset of the disease or disorder, but also to its progression and maintenance. The word comes from Greek πάθος pathos 'suffering, disease' and γένεσις genesis 'creation'.
Pathogenesis
Pathophysiology
Phenotype 
Risk factor
Transmission 
Disease ecology
Anatomy of an Epidemic
Presentation 