Vomiting and diarrhea together are usually caused by a viral or, sometimes, bacterial gut infection (gastroenteritis) and typically improve within a few days. The main risk is dehydration, so the priority is sipping fluids regularly, using oral rehydration solutions, and resting. A pharmacist can advise on rehydration and symptom relief.
See a doctor if symptoms last more than a few days, you cannot keep any fluids down, or you have a high fever. People at higher risk — infants, older adults, pregnant people, and those with chronic illness — should seek advice sooner.
Seek urgent care for signs of dehydration (very little urine, dizziness, dry mouth, sunken eyes, lethargy), blood in vomit or stool, black tarry stools, severe or constant abdominal pain, confusion, or symptoms after travel to areas with serious gut infections. For severe dehydration or a child who is floppy and unresponsive, call your local emergency number. Informational only.