Understanding Stomach Flu: Causes, Symptoms & Treatment

Understanding Stomach Flu: Causes, Symptoms & Treatment Published on: 13th January 2026 Medically reviewed by: Dr. Nitasha Nawaz Stomach flu can occur suddenly. You may feel tired when you wake up and go about your normal routine during the day, but at night, you are likely to experience stomach cramps. Nausea follows. Soon, you’re making repeated trips to the bathroom, wondering what went wrong. Many patients at First Response Healthcare Center describe this exact moment of concern and uncertainty. Is it something you ate? Is it the flu? Should you wait it out or seek help? If you’ve ever paused to ask yourself what is stomach flu, you’re far from alone. Let’s discuss it in a clear, calm, and reassuring manner.