Anonymous Is the following sentence grammatically correct?"I use olive oil for my itching when I take narcotics and when I get bee stings and exercise urticaria."

"exercise urticaria" is not correct.

This first part is awkward, but grammatically OK.
I use olive oil for my itching when I take narcotics and when I get bee stings.

Be careful with the word "narcotics" in American English. It meant illegal drug,

http://www.google.com/search?q=narcotics&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

If you're trying to use medical terms, then make sure the whole sentence is using correct terminology. "When I take narcotics, get bee stings or urticaria, I use olive oil for pruritis." (Remember, pruritis means "itching" and of course, "urticaria" is hives. On a side note, I've never heard of anyone breaking out into hives simply by exercising.)

AnonymousOn a side note, I've never heard of anyone breaking out into hives simply by exercising.

That's not what the original poster wrote.
The OP wrote "exercise urticaria." Perhaps they meant "contract urticaria"

Urticaria is the medical term for hives. A single hive (like a bee sting) is called a wheal.