Why do I get nauseous before I eat?

Seek medical care. Your question suggests that you are nauseated often, especially when you are hungry or just before mealtimes but that eating tends to make your nausea worse. If that is what you mean then you may have any of a number of conditions - stomach ulcers, stomach irritation such as gastritis, acid reflux, and even gallbladder and pancreas disorders. Please see a physician soon.