How are you feeling?
How are you? The question typically has an emphasis on the listener's health. Miranda, I heard you were sick recently. How are you feeling these days?
How (are) you feeling?
an inquiry into the state of someone's health. Sally: How are you feeling? Bill: Oh, better, thanks. Sally: That's good. Bill: Hey, Jane! You been sick? Jane: Yeah. Bill: How you feeling? Jane: Not very well.