if you flush, or if there is a flush on your cheeks, your face goes red because you are embarrassed
If you feel pain, or if you are in pain, you feel great discomfort in a part of your body, because of illness or an injury
Pain is the unhappiness that you feel when something upsetting happens
thing that cures
I had an ear infection
An infection is a disease caused by germs
A cure for a problem is some thing which brings it to an end