Eating spoiled cauliflower can result in foodborne illness, often presenting symptoms like nausea, vomiting, diarrhoea, abdominal pain, and sometimes fever. These symptoms can appear anywhere from a few hours to a few days after consumption, depending on the type of bacteria involved. If you suspect you've eaten spoiled cauliflower and are feeling unwell, it's recommended to seek medical attention. To avoid such issues, always ensure your cauliflower is fresh and stored properly.