There is a difference.
Whether you have learned this fact or not, ignorance in this case is not bliss.
When someone is feeling sick in their stomach, they SHOULD say, “I feel nauseated.”
However, I constantly hear, “I’m nauseous.”
Do you know what that statement means? Nauseous is something that causes disgust or nausea.
So if you say, “I’m nauseous,” you mean that you cause people to be sick in their stomach!
Hmmmm…Do you really make people feel like throwing up?
I doubt it.