Few things can disrupt your day as quickly as a gastrointestinal (GI) illness. Whether it's caused by a virus, bacteria, or parasite, these infections often bring uncomfortable symptoms such as nausea, vomiting, diarrhea, stomach cramps, and fatigue. While many people recover within a few days, some infections can be more severe—especially for young children, older adults, pregnant women, and those with weakened immune systems. Let's take a closer look at some of the most com