comes and goes
La moda va y viene, no hay que preocuparse tanto.
Fashion comes and goes, there's no need to worry so much.
No tiene amo, es un gato callejero que va y viene cuando quiere.
He has no owner, he is a stray cat who comes and goes as he pleases.
Va y viene, viene y va hacia el buzón.
He goes back and forth, back and forth, towards the mailbox.
The pain comes and goes.