This is the 494th most frequent Spanish word.
enfermedad
Illness or disease.
In this sentence, "enfermedad" is used to describe a general and abstract concept relating to a medical condition or sickness.
La enfermedad es causada por un virus.
The illness is caused by a virus.
Here, "enfermedad" refers to a specific condition affecting an individual, highlighting its personal impact.
Él padece una enfermedad rara.
He suffers from a rare illness.
In this context, "enfermedad" is used to denote a type of disease, specifically one that is infectious and under scientific study.