"Rotten eggs" refer to eggs that have gone bad due to bacterial growth or spoilage. When eggs spoil, they can emit a strong, unpleasant odor, often described as sulfurous. This smell is caused by the breakdown of proteins in the egg, which releases gases. Consuming rotten eggs can lead to food poisoning, with symptoms like nausea, vomiting, and diarrhea. To determine if an egg is rotten, a simple test can be performed. Place the egg in a bowl of water; if it sinks and lays flat, it is fresh. If it stands upright or floats, it is likely spoiled and should be discarded. Proper storage in the refrigerator can help extend the shelf life of eggs.