Translation of "Onset" in Spanish

Was actually the onset of mental illness,

era en realidad el principio de una enfermedad mental

And it delays the onset of Alzheimer's disease.

y retrasa el Alzheimer.

Well, we seem to develop sudden-onset amnesia,

parece que desarrollamos amnesia repentina,

Since the onset of the pandemic, we have made decisions based on science, data and evidence from health experts.

Desde el inicio de la pandemia, nosotros hemos tomado decisiones basadas en la ciencia, datos y pruebas de los expertos en salud.