Vomiting That Will Not Stop

If you cannot keep any fluid down at all, that is a reason to be seen now — you do not have to wait 24 hours first. Call 911 for vomiting with confusion, a severe headache, a stiff neck, chest pain, or blood.

Emergency physicians give two separate triggers here, and the important thing is that they are separate:

“If symptoms continue for more than 24 hours, or if you are unable to tolerate any fluids, contact your primary care doctor or visit the emergency department.”

More than 24 hours. Or unable to keep any fluids down.

The second does not require the first. Somebody four hours in who has brought back every sip of water is already there — and reading that sentence as “wait a day, then decide” is the way to turn a manageable problem into a drip.

And a third trigger, stated on its own: “Also seek emergency care if you become dehydrated.”

Why not keeping fluids down is the line

Vomiting itself is miserable and mostly self-limiting. What causes harm is the arithmetic: fluid going out, none staying in, and a body with no way to correct it.

ACEP puts it plainly: “Continued vomiting to the point of dehydration requires medical attention.”

That is also the thing an emergency department fixes quickly and well. Fluid into a vein bypasses the stomach entirely, which is why people who arrive feeling dreadful after two days of this often feel human again within hours.

Children reach that point much sooner

ACEP is explicit that this is not one threshold for everybody: “Adults can handle dehydration better than small children and that high fever also can indicate a more serious illness.”

So for a small child, do not use the adult clock. A child who is vomiting repeatedly, will not drink, has no wet nappies or has stopped passing urine, is unusually sleepy or floppy, has no tears when crying, or has a dry mouth should be seen now rather than at the 24-hour mark.

And a high fever alongside vomiting is on ACEP’s list as a marker of something more serious, in a child or an adult.

Call 911 rather than driving

Vomiting is sometimes a symptom of something that has nothing to do with the stomach:

• Vomiting with confusion, drowsiness, or difficulty waking
• Vomiting with a severe headache, a stiff neck, or light hurting the eyes
• Vomiting with chest pain or breathlessness
• Vomiting after a head injury
• Vomiting blood, or material that looks like coffee grounds
• Vomiting with severe abdominal pain, or an abdomen that is rigid
• Vomiting in somebody with diabetes who is becoming drowsy or breathing deeply

The first three are on that list because the cause may be in the head or the chest rather than the gut. Vomiting that comes with a severe headache and a stiff neck is a different emergency wearing the same symptom.

For pain-led presentations, abdominal pain has its own page and its triggers are sharper.

Come in

• You cannot keep any fluid down — at any point. Do not wait for the 24 hours
• Vomiting for more than 24 hours
• Signs of dehydration: very little or no urine, dizziness on standing, a dry mouth, weakness, or feeling confused
• A small child vomiting repeatedly, or refusing fluids
• Vomiting with a high fever
• Vomiting in pregnancy that is preventing you from drinking
• Vomiting in somebody frail, elderly, or with a serious ongoing condition
• Vomiting alongside a medication you cannot keep down — insulin, heart, epilepsy or transplant medicines make this urgent rather than inconvenient

Our emergency rooms are open every hour of every day and are walk-in, with a full laboratory in the building — which is how dehydration and its knock-on effects get measured rather than guessed. Go to the nearest one, and if another emergency department is closer to you, that one is the right answer tonight.

If you are unsure, come in — this list is not exhaustive and you are not expected to judge your own fluid balance.

Getting fluids back in, once it settles

ACEP’s instruction is modest and specific: “Sip water or diluted juice as soon as vomiting has decreased.”

Sip. Not drink. A glass of water taken at once after several hours of vomiting usually comes straight back, and the person concludes they cannot tolerate fluids when the volume was the problem. Small amounts, often, starting sooner than feels appetising.

And on food: ACEP notes that most adults can manage a day without nutrition. So eating is not the goal and not the measure — drinking is. That distinction is worth holding onto, because worrying about food while failing to get fluids in is a common way to mistime this.

Questions people actually ask

It has been six hours and nothing stays down. Do I wait until 24? No. Not tolerating any fluids is a trigger in its own right in ACEP’s own sentence. The 24 hours is for symptoms continuing, not a waiting period before you are allowed to be seen.

Everyone in the house has it. Common, and it does not change the individual test: can each person keep fluids down. Watch the youngest and the oldest most closely.

Should I take an anti-sickness medicine? This page gives no doses and recommends no product. If you have something prescribed for this, use it as prescribed; otherwise it is a question for a pharmacist or whoever sees you.

There are streaks of blood after hours of retching. Mention it and be seen. Forceful vomiting can cause minor bleeding, and it can also mean something else — and telling those apart is not a home task.

My child has vomited twice and is playing happily. Keep offering small sips and watch the urine. Twice and cheerful is different from repeatedly and floppy, and the second is a now.

I have diabetes and cannot keep anything down. Be seen. Illness changes what your body needs, you cannot hold down what corrects it, and this is the group where a stomach bug becomes a different problem fastest.

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Cannot keep any fluid down? Come now — the 24 hours is a separate trigger, not a waiting period. Call 911 for vomiting with confusion, a severe headache and stiff neck, chest pain, or blood. Both of our emergency rooms are open 24 hours a day, every day of the year — walk in, no appointment and no referral. Find your nearest emergency room →

Related reading: abdominal pain and when to go · which door do you need

Sources

53. Food Poisoning — Know When To Go — American College of Emergency Physicians. https://www.emergencyphysicians.org/article/know-when-to-go/food-poisoning

This article is general information, not a diagnosis. It gives no doses and recommends no product. If you are unsure, come in — this list is not exhaustive and you are not expected to assess your own dehydration. If it might be an emergency, treat it as one and call 911.