Stomach bug is a term used to describe gastroenteritis, which is an infection of the digestive system caused by a virus, bacteria, or parasite. The most common cause of stomach bug is a virus, such as norovirus or rotavirus. The symptoms of a stomach bug include:

• Diarrhea, which is usually watery and non-bloody
• Nausea and vomiting
• Stomach cramps and pain
• Headache and muscle aches
• Fever, in some cases

Stomach bugs are highly contagious and can spread easily from person to person through contact with contaminated surfaces, food, or water. The best way to prevent a stomach bug is to practice good hygiene, such as washing your hands frequently and avoiding close contact with people who are sick. Most cases of stomach bug resolve on their own within a few days, and treatment typically involves rest, hydration, and over-the-counter medications to manage symptoms. However, in some cases, such as for infants, older adults, and people with weakened immune systems, a stomach bug can be more severe and require medical attention.