Pain Killers simply circulate around your whole body. When a part of your body hurts it sends "pain messages" to your brain to tell it, it is in pain. Pain killers bind to receptors and block these messages so you don't perceive the feeling of pain.
Pain Killers simply circulate around your whole body. When a part of your body hurts it sends "pain messages" to your brain to tell it, it is in pain. Pain killers bind to receptors and block these messages so you don't perceive the feeling of pain.