This is the 12753rd most frequent Spanish word.
ocurren
"Occur" or "happen."
Here, 'ocurren' is used to indicate that events or transformations take place.
En otoño, ocurren cambios en la naturaleza.
In autumn, changes occur in nature.
In this example, 'ocurren' is understood as the emergence of thoughts or concepts unexpectedly.
Las mejores ideas ocurren cuando menos lo esperas.
The best ideas occur when you least expect them.
In this statement, 'ocurren' conveys the possibility or happening of issues or difficulties.