You can get food poisoning after ingesting food that has been contaminated with a variety of toxic substances or germs. You can also become sick after eating food that has spoiled, was not cooked completely, or was not refrigerated properly after purchase. Common symptoms of food poisoning include nausea, vomiting, stomach cramps, and diarrhea after eating contaminated food. Pregnant women, young children, and older adults are at a higher risk of developing a foodborne illness.