No wonder = it is not surprising. Ex: No wonder I couldn't find my sunglasses. They were on my head all along! Ex: No wonder you have a stomach ache. You ate the whole box of cookies! "It's no wonder" and "no wonder" can be used interchangeably.

Question: What does 'No wonder' mean? Answer: We say this when we receive some news that doesn't surprise us. 'No wonder John has lost his job. He's the laziest person I've ever met.'

Literally, the phrase means "There Is no wonder" in the news.