Please understand that ordinarily our body and mind are not in a condition to experience suffering. There must be ignorance or something to condition it to become receptive to the possibility of suffering. And so it is said that the mind/body only now arises in this case. It means that ignorance conditions consciousness and this consciousness helps the mind/body change and arise to action and become capable of experiencing suffering. In this kind of mind/body, at this moment, the sense bases arise which are also primed to experience suffering.