What Does It Mean When You Can''t Keep Water Down?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 21st, 2026.
When you can't keep water down, it indicates severe nausea and vomiting that prevents fluid retention. This condition, called inability to tolerate oral fluids, often signals dehydration risk and underlying illness. Common causes include viral gastroenteritis, food poisoning, medication side effects, or pregnancy-related morning sickness. The inability to retain even small sips of water for 12-24 hours can lead to dangerous dehydration, especially in children and elderly adults. Persistent vomiting lasting more than 24 hours, accompanied by signs like dizziness, decreased urination, or dry mouth, requires immediate medical attention to prevent complications.
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