Yes, the flu can cause stomach problems in adults, including nausea, vomiting, and diarrhea, though these symptoms are usually milder than the fever, cough, and body aches that define the illness. Many adults each flu season are surprised to learn that their stomach discomfort is connected to influenza rather than a separate stomach bug. Flu season tends to bring a steady wave of questions about these overlapping symptoms. In this blog, we will discuss how ...