In German we have a figure of speech: "Das geht von selbst vorbei", which normally means that an illness will pass without the need to treat it with medicaments or something special at all. Is there a similar figure of speech known in the English language, too?
Because I'm trying to translate a joke I will share it with you, too. Perhaps you could figure out a better way of translation (I doubt that it would be worth to be a question of its own):
Two planets chat: "How are you?" "Not so good; feelin' miserable!" "Oh? What's up?" "I have Homo sapiens..." "Nah, don't worry: it will run its course!"