Expired sour cream can make you sick if it has been contaminated with bacteria or mold. Consuming expired sour cream can cause food poisoning, which can lead to unpleasant digestive issues. If you eat expired sour cream, you run the risk of getting sick, but how sick you get depends on how long it has been expired and how it was stored. If you have expired sour cream that has not been opened, it is still safe to consume as long as it has not been contaminated with food particles, insects, or mold. However, it is important to check for signs of spoilage before using it. Signs of spoilage include mold, off-color, off-smell, and separation. If you notice any of these signs, it is best to throw it away to avoid getting sick. In summary, it is not recommended to eat expired sour cream, and it is best to check for signs of spoilage before using it.