HowStuffWorks explains that food poisoning often occurs when a person eats spoiled food. Common symptoms of food poisoning are stomach pain, diarrhea, nausea, vomiting and cramping.
Generally, people get sick within four to 48 hours after eating spoiled or contaminated food, says HowStuffWorks. According to KidsHealth, food poisoning results from eating foods that contains harmful bacteria or toxins. Bacteria are found everywhere, especially in spoiled leftovers. Most are benign, but it is important to handle and store food safely to prevent this type of illness. The most common sources of germs that cause food poisoning are meat, chicken, milk, eggs and shellfish. Raw foods and unwashed vegetables sometimes also contain germs that cause food poisoning.
Some people feel sick mere hours after eating bad food, while others do not notice symptoms for several days, states KidsHealth. The treatment that a doctor prescribes depends on the specific cause of the illness. Mild cases of food poisoning typically lead only to brief sickness and do not require treatment, but the person must drink plenty of clear fluids in order not to become dehydrated. In cases of extreme dehydration due to the nausea, vomiting or diarrhea that sometimes accompany a case of food poisoning, a hospital visit is necessary. It is also important to see a doctor immediately if a person notices blood in his feces.