Stomach Bug

• Sudden onset of vomiting
• Watery diarrhea (usually not bloody)
• Stomach cramps and pain
• Nausea
• Low-grade fever and chills
• Headache and body aches
• Loss of appetite
• Signs of dehydration: dry mouth, dark urine, fewer wet diapers, fatigue

Stomach bugs are usually caused by viruses (most commonly norovirus and rotavirus), and less often by bacteria (like Salmonella or E. coli) or parasites. They spread through contact with an infected person, contaminated surfaces, food, or water, and tiny droplets from vomit. Norovirus in particular is extremely contagious and can survive on surfaces for days.

Stomach bugs are among the most common illnesses in children, with the average child experiencing 1 to 2 episodes per year. Norovirus alone causes an estimated 19 to 21 million cases of acute gastroenteritis annually in the U.S., with outbreaks peaking in winter and spreading rapidly through schools and daycares.

There is no specific cure, so treatment focuses on rest and preventing dehydration. Offer small, frequent sips of water, oral rehydration solutions (like Pedialyte), or ice chips. Avoid sugary drinks, juice, and sports drinks, which can worsen diarrhea. Reintroduce bland foods (toast, rice, bananas, applesauce) once vomiting stops. Call a doctor if you see signs of dehydration, blood in stool or vomit, a high fever, or symptoms lasting more than a few days.

Wash hands thoroughly with soap and water for at least 20 seconds, especially after using the bathroom, changing diapers, and before eating or preparing food (hand sanitizer is less effective against norovirus). Clean and disinfect contaminated surfaces with a bleach-based cleaner. Wash soiled laundry on hot. Keep sick children home from school for at least 24 to 48 hours after vomiting and diarrhea stop. The rotavirus vaccine protects babies from one of the most severe causes.

Track Stomach Bug and other illnesses at your child's school in real time.