How to Say "illness" in Spanish
The most common Spanish word for “illness” is “enfermedad” — use 'enfermedad' when referring to a specific physical or mental condition that affects a person or animal's health..
enfermedad
en-fer-meh-DATH/en.feɾ.meˈðað/

Examples
La gripe es una enfermedad muy contagiosa.
The flu is a very contagious illness.
El doctor identificó la enfermedad rápidamente.
The doctor identified the disease quickly.
¿Qué enfermedad tiene el niño?
What sickness does the child have?
Gender Rule for '-dad'
Almost all Spanish nouns ending in -dad are feminine. This means you must use 'la' or 'una' before it: 'la enfermedad' (the illness).
Confusing Noun and Adjective
Mistake: “Using 'enfermedad' (noun) when you mean 'enfermo' (adjective): 'El hombre está enfermedad.'”
Correction: Use the adjective 'enfermo' (sick) instead: 'El hombre está enfermo.' 'Enfermedad' is the state of being sick.
mal
/mal//mal/

Examples
La película trata sobre la lucha entre el bien y el mal.
The movie is about the fight between good and evil.
No quiero hacerte ningún mal.
I don't want to do you any harm.
El doctor busca el origen del mal.
The doctor is looking for the source of the illness.
Always Masculine
When 'mal' is a noun, it's always masculine. You'll always see it with 'el' or 'un', as in 'el mal' (the evil).
Confusing it with the adverb
Mistake: “La lucha entre el bien y mal.”
Correction: La lucha entre el bien y el mal. When it's a noun representing the concept of 'evil', it needs an article like 'el' before it.
General Illness vs. Abstract Evil
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