Food Poisoning: Causes, Symptoms & Prevention Food poisoning is one of the most common health problems worldwide, caused by consuming contaminated food or drinks. While many cases are mild and resolve within a few days, severe food poisoning can lead to serious illness and even hospitalization. Causes The main causes of food poisoning are harmful bacteria, viruses, parasites, and toxins. Common culprits include Salmonella, E. coli, Listeria, and Norovirus . These germs spread through undercooked food, expired items, unwashed fruits and vegetables, or food prepared in unhygienic conditions. Street food and improperly stored leftovers are also major contributors. Symptoms Symptoms usually appear a few hours to three days after consuming contaminated food. They can vary in intensity but often include: Nausea and vomiting Diarrhea Stomach cramps Fever and weakness Dehydration In severe cases, food poisoning can be life-threatening, especially for children,...