The proper phrase is “hunger pangs.” What is a “pang” you ask? Why a brief feeling of emotional or physical pain, of course. Confusing? Absolutely.
The muddle over the “hunger pangs” vs. “hunger pains” is understandable, but when there’s a correct answer, you’ve got to go with it.
You might have back pains, growing pains, or pains in the neck, but you don’t have “hunger pains.” Unless there’s major malnourishment involved, “pang” is the word you need.
Happy writing and bon appetit!