Kia tumhara dimagh kharab hai? / Tumhara dimaag theek hai?

How to say “Kia tumhara dimagh kharab hai” in English

When you want to say “Kia tumhara dimagh kharab hai?” (or “Tumhara dimaag theek hai?”) in English, the natural, everyday way is “Are you out of your mind?”. It fits scolding & anger.