A lot will depend on the history.
I suspect that you are young and daft, and the proplem has occurred recently-it's probably ok to adopt a strategy of "wait and see," hoping the problem will resolve on it's own-it could be down to someting as simple as snot in the middle ear.
If like me, you are older and daft, the problem may be more long term. In this case, get your ears and bp checked.
This may serve as a warning about the dangers of i-pods. Medical wise, tinnitus can't really be tested for, but hearing loss can.
