Iatrogenic: cause is the result of an unintended or unwanted medical treatment. Pathogenesis: steps in the development of the disease/how the disease developed. They are the framework for pathophysiology (the study of abnormalities in physiological functions). An understanding of the etiology, pathogenesis, and clinical consequences of a particular disorder may imply that certain treatments could be helpful. ** an 87-year-old patient presents in the emergency room with a 102 f temperature, 125 bpm heart rate, and is hypotensive. Prior to being admitted to the hospital the doctor diagnosis the patient with. Latent or incubation period (no recognition by patient, lab tests may detect) Prodromal period/ prodrome (appearance of first signs/symptoms (non-specific) Subclinical phase (patient functions normally although disease well established) Acute: severe manifestations for a short time (hours a few weeks) ** acute can turn to chronic, but chronic cannot turn to acute. Exacerbations: sudden increase in severity of disease. Remissions: decline or abatement in severity of disease.