Nausea can make it difficult to eat, drink, or get through your normal daily routine. If you suddenly feel queasy alongside fatigue, chills, or body aches, you may wonder whether the flu is responsible. Although influenza is best known for causing respiratory symptoms, it can also affect your stomach and digestive system. Yes, the flu can cause nausea, sometimes even before respiratory symptoms appear. However, nausea has many possible causes, including stomach viruses, food poisoning ...