Vomiting or Nausea: When to Worry, and Where to Go

The red flags that mean call 911, when the ER, urgent care, or your doctor is the right choice, likely causes, and what it costs. Or answer a few questions for a recommendation tailored to you.

Check my symptoms (free, 2 min)

Educational guidance, not a diagnosis. Medically reviewed by Dr. Prathima Madda, MBBS. Updated July 15, 2026.

Call 911 now if you have:

Vomiting with a sudden, severe 'worst headache of my life,' a stiff neck plus fever, confusion, or a new seizure (possible bleeding in or around the brain, or meningitis)
Vomiting with stroke signs: face drooping, arm or leg weakness or numbness on one side, slurred or garbled speech, sudden trouble seeing or walking (call 911 immediately, note the time symptoms started)
Vomiting with chest pain, pressure, or tightness, shortness of breath, or pain spreading to the arm, jaw, or back (a heart attack can show up as nausea and vomiting)
Vomiting large amounts of bright red blood, or fainting, near-fainting, cold and clammy pale skin, or rapid shallow breathing (signs of shock or heavy internal bleeding)
Vomiting after a significant head injury, especially with drowsiness, confusion, repeated vomiting, unequal pupils, or loss of consciousness
Signs of a severe allergic reaction: vomiting with swelling of the lips, tongue, or throat, hives, wheezing, or trouble breathing
A baby or child who is limp, unresponsive, hard to wake, having trouble breathing, or turning blue
Vomiting after swallowing a poison, a medication overdose, or a household chemical, or if a child may have swallowed a button battery or magnet (call Poison Control at 1-800-222-1222 or 911). An acetaminophen (Tylenol) overdose can start with only nausea and is time-critical.
Nausea and vomiting with headache and dizziness that affects several people in the home or eases when you go outside (possible carbon monoxide poisoning): get everyone into fresh air and call 911.

When in doubt about a possible emergency, call 911. Do not drive yourself.

Most nausea and vomiting comes from a stomach bug, food, motion, or medication and settles within 1 to 2 days with rest and small sips of fluid, but blood in the vomit, a severe headache, chest pain, confusion, or signs of dehydration change the picture fast.
Call 911 for vomiting with sudden worst-ever headache, stroke signs (face droop, arm weakness, slurred speech), chest pain, confusion, a stiff neck with fever, or after a significant head injury.
Go in sooner if you cannot keep any fluids down, are getting dehydrated, are pregnant, very young, elderly, or have diabetes or another serious condition, since these raise the risk quickly.

ER, Urgent Care, Doctor, or Home?

Go to the ER

The ER is the right choice when vomiting comes with dangerous companions, such as blood, severe or localized belly pain, a green bile with a blocked-up belly, dehydration you cannot correct at home, or vomiting in a high-risk person (pregnant, diabetic, very young, elderly, or immunocompromised). When bleeding, obstruction, or a heart, brain, or abdominal emergency is possible, an ER has the imaging, IV fluids, and specialists that urgent care does not.

Vomiting blood, or vomit that looks like dark brown 'coffee grounds' (bleeding in the stomach or esophagus)
Green or bright yellow bile with severe, constant, or cramping belly pain, a swollen belly, and no gas or bowel movements (possible bowel obstruction)
Severe or worsening abdominal pain, pain that has moved to the lower right side, or a rigid, very tender belly (possible appendicitis, gallbladder, or pancreas problem)
Cannot keep down any fluids for more than a day, or signs of significant dehydration: very little or no urine, sunken eyes, dizziness when standing, rapid heartbeat, extreme weakness, or confusion
Persistent vomiting in someone with diabetes (risk of diabetic ketoacidosis), or fruity-smelling breath, deep rapid breathing, and drowsiness
Vomiting with severe pain plus a fever, or in someone pregnant with belly pain, unable to keep fluids down, or vomiting many times a day
In a baby about 2 to 8 weeks old: forceful, projectile vomiting after most feeds that is getting worse (possible pyloric stenosis, which needs surgery).
In a young child: repeated episodes of severe crying while drawing up the legs, with vomiting and stool that looks like red currant jelly (possible intussusception, a bowel emergency).
An infant or young child who cannot keep fluids down for even a few hours, or has no wet diaper for 6 to 8 hours, no tears when crying, a sunken soft spot, or unusual sleepiness (children dehydrate within hours, not days).
A new, progressively worsening headache that is worst in the morning or wakes you from sleep, with vomiting (possible raised pressure in the brain).

Urgent care

Vomiting from a likely stomach bug or food that has lasted more than a day and you are mildly dehydrated but still alert and passing some urine
Moderate nausea and vomiting with a fever, mild-to-moderate belly pain, or diarrhea that is not improving on its own
You need anti-nausea medication or a bag of IV fluids to get over the hump, but have no red-flag or ER-level symptoms
A child with several episodes who is drinking a little and still making tears and wet diapers, when your pediatrician is not available
Vomiting after starting a new medication when you are otherwise stable and want to be checked and advised

See your doctor / telehealth

Nausea or vomiting that keeps coming back over days to weeks, or a recurring pattern you cannot explain
Vomiting linked to a new medication, chemotherapy, migraines, or a known condition, to adjust treatment
Unintentional weight loss, ongoing loss of appetite, heartburn, or vomiting that happens after most meals
Nausea in early pregnancy that is bothersome but you can still keep some fluids and food down (to discuss safe treatment)
You are managing at home but want guidance; telehealth is a good first step for advice, prescriptions, and deciding whether to be seen in person

Safe to manage at home

Most short-lived vomiting from a stomach bug, mild food poisoning, motion sickness, or a hangover can be managed at home if you stay alert and can eventually keep fluids down
Rest your stomach for a few hours, then take small, frequent sips of clear fluids (water, oral rehydration solution, broth, diluted juice); an oral rehydration solution replaces salts better than water alone
When the vomiting eases, add bland foods slowly (crackers, toast, rice, bananas, applesauce) and avoid greasy, spicy, very sweet, or fatty foods, alcohol, and strong smells
Avoid solid food, dairy, caffeine, and NSAIDs like ibuprofen on an upset stomach; rest and let it settle
Watch for dehydration and get help if you cannot keep fluids down for 24 hours, urine becomes dark or stops, or any red-flag symptom appears

Not sure which fits your situation? Answer a few questions for a recommendation, or see the full ER vs. urgent care guide.

Common Causes

These are possibilities to discuss with a clinician, not a diagnosis. Only an exam and sometimes tests can tell which applies to you.

This is general education, not a diagnosis: a clinician needs to evaluate you to know your specific cause.
Viral gastroenteritis ('stomach flu') and food poisoning, often with diarrhea and cramps
Motion sickness, migraine, inner-ear problems (vertigo), or a reaction to strong smells
Medications and treatments (antibiotics, opioids, chemotherapy) and alcohol
Pregnancy (morning sickness, or more severe hyperemesis gravidarum)
More serious causes that need urgent evaluation: appendicitis, gallstones, pancreatitis, bowel obstruction, ulcers or GI bleeding, kidney infection, heart attack, concussion, increased pressure in the brain, or diabetic ketoacidosis

Regular cannabis user with repeated cycles of severe vomiting that only hot showers seem to ease? See our guide to cannabinoid hyperemesis syndrome (CHS).

What to Expect if You Are Seen

A focused history and exam: how long, how often, what the vomit looks like (blood, bile, food), and your belly, hydration, and vital signs
Anti-nausea medication and, if you are dehydrated, IV fluids to help you feel better and rehydrate
Blood and urine tests to check electrolytes, kidney function, blood counts, blood sugar, and (if relevant) a pregnancy test
Imaging when a serious cause is suspected: abdominal ultrasound or CT for belly pain, or a head CT after injury or with neurological symptoms
Observation to see whether you can keep fluids down, then discharge with instructions or admission if you need ongoing care

Worried about the cost?

See typical pricing in our doctor visit cost guide and ER visit cost guide, or estimate your exact cost. Uninsured? Check hospital charity care. Already have a bill? Bill Defense can negotiate it down.

Before You Go, Have This Ready

A timeline: when it started, how many times you have vomited, and what the vomit looked like (blood, coffee-grounds, green bile, food)
A list of your medications, supplements, allergies, medical conditions, and recent new medicines or foods
Any related symptoms (fever, belly pain and where, headache, diarrhea, dizziness, last urination) and, if possible, whether you are or could be pregnant
For a child: their weight, number of wet diapers, and whether they are still making tears and staying alert

Still not sure? Let the free checker decide

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Frequently Asked Questions

How long is it safe to wait out vomiting at home?

For an otherwise healthy adult, short-lived vomiting from a stomach bug or food usually improves within a day or so. Seek care if it lasts more than 24 hours, you cannot keep any fluids down, you show signs of dehydration, or any red-flag symptom (blood, severe pain, severe headache, confusion, chest pain) appears. Infants, older adults, and people with diabetes or other serious conditions should be seen sooner.

What does 'coffee-grounds' vomit mean and is it an emergency?

Vomit that looks like dark brown or black coffee grounds is blood that has been partly digested, which suggests bleeding in the stomach or esophagus. Along with bright red blood in vomit, this needs urgent evaluation. Go to the ER, and call 911 if you also feel faint, have a racing heart, cold clammy skin, or black tarry stools.

When does dehydration from vomiting become dangerous?

Warning signs include very little or no urine, dark urine, extreme thirst, dry mouth, dizziness when standing, rapid heartbeat, sunken eyes, and, when severe, confusion or fainting. In children, watch for no wet diapers, no tears when crying, sunken eyes, and unusual sleepiness. Significant dehydration warrants urgent or emergency care for IV fluids.

I'm pregnant and can't stop vomiting. What should I do?

Some nausea in pregnancy is common, but if you cannot keep fluids or food down, are losing weight, feel dizzy, or are urinating very little, you may have hyperemesis gravidarum and need evaluation and IV fluids. Contact your obstetric provider promptly, and go to the ER for severe belly pain, vomiting blood, fever, or signs of dehydration.

Green or yellow vomit, should I worry?

A little yellow-green bile can appear when your stomach is empty and you keep retching, which by itself is often not an emergency. But bright green or yellow bile with severe or cramping belly pain, a swollen belly, and no gas or stool can signal a bowel obstruction and needs emergency evaluation.

More symptom guides

All symptom guides Free symptom checker ER vs. urgent care

Sources

MedlinePlus (U.S. National Library of Medicine / NIH), Nausea and vomiting - adults
Mayo Clinic, Nausea and vomiting: When to see a doctor; Vomiting blood
American College of Emergency Physicians (ACEP), guidance on when to seek emergency care
Cleveland Clinic, vomiting and hematemesis (vomiting blood) patient information
Centers for Disease Control and Prevention (CDC), norovirus and dehydration/rehydration guidance

This guide is educational and not a substitute for professional medical advice. For an emergency, call 911. Medically reviewed by Dr. Prathima Madda, MBBS. Last updated July 15, 2026.