Question

A __________ is something observable and indicates the presence of an illness (e.g., reddening of the skin). A __________ is a change from normal function, sensation, or appearance, generally indicating disease.

Answer 1

Sign

Symptom

Step-by-step explanation:

In medical terminology, a sign is something objective and observable that indicates an illness. In other words, it is observable evidence that indicates the presence of an illness and it doesn't depend on the description of the patient but it's something observable.

On the other hand, a symptom is something subjective, something that is experienced by the person (and that it indicates a disease) but that it's not observable by others, therefore it has to do with changes that are not observable such as function or sensations.