What are characteristics of organisms that can cause disease , but live on us everyday without typically giving us disease ?
In this model , it is possible for a person to have a disease without being ill ( to have an objectively definable , but asymptomatic , medical condition ) , and to be " ill " without being " diseased " ( such as when a person perceives a normal experience as a medical condition , or medicalizes a non-disease situation in his or her life ) .