Yes Campbell's chicken noodle soup is a good soup to eat when you have the flu or other illness.
I always keep Campbell's chicken noodle soup around so that I can eat it when I'm sick and need nutrition when I don't have much of an appetite.
When you eat hot chicken noodle soup or any other hot soups it helps to clear up congestion and the salt in the chicken noodle soup helps soothe sore throats.
Chicken Noodle Soup also has anti inflammatory properties as well which can help clear up the flu and colds.