01 · Overview
The short version
The pattern gives clues
Vomiting with diarrhea points more toward gastroenteritis or food poisoning. Nausea after meals may fit reflux, ulcers, or gallbladder trouble, while migraine, pregnancy, and medicines are also common causes.
Fluids are the first priority
Repeated vomiting can quickly cause dehydration. Dry mouth, dark urine, peeing less, dizziness, and weakness are warning signs that you may need medical care.
Some symptoms are urgent
Blood in the vomit, severe belly pain, a severe headache with a stiff neck, vomiting after poisoning, or vomiting that lasts longer than 24 hours should be checked right away.
Small sips are easier than big drinks
If you keep throwing up, small amounts of clear liquids often stay down better than large gulps. Bland foods can help once vomiting starts to settle.
02 · Care guidance
When to get help
Emergency help
- Call 911 or local emergency services now if vomiting comes with chest pain, trouble breathing, confusion, fainting, signs of stroke, severe dehydration with inability to wake or respond normally, or a possible overdose or poisoning.
- Get emergency help right away for sudden severe abdominal pain, a rigid belly, vomiting with blood that is more than a small streak, black or bloody stools, or signs of anaphylaxis such as swelling, wheezing, or hives with vomiting.
- For pregnancy, seek urgent care immediately if vomiting happens with severe one-sided lower belly pain, heavy vaginal bleeding, shoulder pain, or fainting, because these can be signs of ectopic pregnancy.
Get advice promptly
- Contact a clinician promptly if you have vomiting for more than 24 hours, repeated vomiting with signs of dehydration, fever, a severe headache, stiff neck, ongoing belly pain, or symptoms after starting a new medicine.
- Call soon if you are pregnant and cannot keep fluids down, if you have diabetes and vomiting with high blood sugar or ketones, or if an older adult, infant, or immunocompromised person is vomiting.
If symptoms are mild and improving, rest, sip fluids, and watch for changes. If nausea keeps coming back, make an appointment to look for a trigger such as reflux, migraine, pregnancy, infection, constipation, or a medicine side effect.
03 · Nausea and Vomiting
What nausea and vomiting are telling you
Nausea is the sick-to-your-stomach feeling; vomiting is the act of throwing up. The pattern around it often gives the first clue to the cause.
Nausea and vomiting are symptoms, not diagnoses. Nausea is the feeling that you might throw up. Vomiting is when stomach contents come back up. Some people feel only nausea, and others vomit with little warning.
The timing matters. Vomiting that starts suddenly with diarrhea often points toward gastroenteritis or food poisoning. Nausea that shows up after meals can fit reflux, ulcers, or some gallbladder problems. Morning nausea can happen with pregnancy, but it is not the only possible cause.
It also helps to notice what else is happening at the same time. Fever, headache, belly pain, missed periods, dizziness, or a recent medicine change can narrow the possibilities even though they do not prove the cause.
- Write down when symptoms started and how often you vomit.
- Notice whether diarrhea, fever, headache, or belly pain is present.
- Check whether symptoms began after a new medicine, travel, or a shared illness in the household.
04 · Nausea and Vomiting
Clues that point to a likely cause
Diarrhea, fever, headache, travel, eating out, or a new medicine can point toward different causes, but no single clue proves the diagnosis.
A stomach virus or food poisoning often causes vomiting, diarrhea, cramps, and sometimes fever. These illnesses can spread from person to person, so a family member with the same symptoms makes infection more likely.
Migraine can also cause nausea and vomiting, sometimes with headache, light sensitivity, or sound sensitivity. Motion sickness is more likely during car, boat, or plane travel. Reflux, ulcers, pregnancy, and some medicines can also trigger nausea, especially when symptoms repeat in the same setting.
If nausea begins after a medicine is started, that timing is important. Some medicines, including cancer treatments and certain pain medicines, can irritate the stomach or affect the parts of the brain that control vomiting.
- Diarrhea and fever make an intestinal infection more likely.
- Headache with light sensitivity can fit migraine.
- New symptoms after a medicine starts may be a side effect.
05 · Nausea and Vomiting
How to avoid getting dehydrated
The main short-term danger from vomiting is losing water and salts faster than you can replace them.
If you can drink, small sips of clear liquids are often easier to keep down than large gulps. That matters because repeated vomiting can leave you short on fluids before the stomach feels calm again.
Signs of dehydration include dry mouth, dark urine, peeing less than usual, dizziness, and weakness. These signs matter more in infants, older adults, pregnant people, and anyone with a chronic illness because they can become dehydrated sooner.
If plain water keeps coming back up, many people do better with tiny amounts more often. The goal is not to drink a lot at once. It is to replace fluid in a way your stomach can tolerate.
- Try small, frequent sips instead of big drinks.
- Watch urine color and how often you are urinating.
- Get help sooner if even small amounts will not stay down.
06 · Nausea and Vomiting
What to eat once vomiting starts easing
Bland foods and smaller meals are easier on an irritated stomach than heavy or strongly flavored foods.
Once vomiting starts to slow, bland foods may be easier than greasy, spicy, or very sweet foods. Smaller meals can also be easier than trying to eat a full plate at once. Strong smells may make nausea worse for some people.
If a food keeps triggering vomiting, stop that item for now and focus on fluids first. The point is to keep something down, not to force a normal meal before your stomach is ready.
Ginger is sometimes used for mild nausea, but it is not a fix for serious vomiting and it will not help everyone. If you cannot tolerate food, the safer goal is still fluid replacement.
- Choose bland, low-fat foods first.
- Eat small amounts more often.
- Avoid strong smells, fried foods, and heavy meals until you feel steadier.
07 · Nausea and Vomiting
When home care is enough, and when it is not
Rest and fluids are reasonable for mild improving symptoms, but worsening vomiting or red flags need medical evaluation.
If symptoms are mild and improving, resting and sipping fluids is a reasonable first step. Many short stomach illnesses improve on their own with supportive care.
Home care is not enough if vomiting is persistent, getting worse, or linked to dehydration. It is also not enough if you have blood in the vomit, severe abdominal pain, a severe headache with a stiff neck, or concern for poisoning.
Pregnancy, diabetes, infancy, older age, and a weakened immune system lower the threshold for care because problems can escalate faster or be harder to judge at home.
- Do not wait if you cannot keep fluids down.
- Blood in vomit or severe pain needs urgent evaluation.
- Pregnancy, diabetes, older age, and immune problems call for earlier care.
08 · Nausea and Vomiting
How clinicians sort out the cause
The story you give, plus a physical exam, usually decides which tests are useful.
A clinician will usually ask when the symptoms started, how often you are vomiting, what the vomit looks like, what you ate, what medicines you take, and whether pregnancy is possible. They will also look for dehydration and signs of belly, neurologic, or infection-related problems.
Testing is not automatic for everyone. Blood and urine tests may be used, and a pregnancy test may be done when that would help explain the symptoms. Stool tests or imaging may be used if the history suggests infection, blockage, gallbladder disease, or another abdominal problem.
Bringing a list of medicines and supplements can matter because a new drug or dose change may explain the symptoms.
- Expect questions about timing, triggers, and other symptoms.
- Tests are chosen based on what seems most likely.
- Tell the clinician if pregnancy is possible or if a medicine change happened recently.
09 · FAQ
Questions people ask
Is vomiting yellow or green fluid dangerous?
It can happen when the stomach is empty and bile comes up after repeated vomiting. It is not always dangerous by itself, but bright green vomit, severe belly pain, or signs of dehydration need prompt medical attention.
Can anxiety cause nausea and vomiting?
Yes, anxiety can make some people feel nauseated and can sometimes lead to vomiting. Still, do not assume anxiety is the only cause if you also have fever, diarrhea, weight loss, severe pain, blood, or symptoms that started suddenly and strongly.
Do I need tests for nausea and vomiting?
Not always. If symptoms are mild and there is an obvious short-lived cause, testing may not be needed. If symptoms are severe, persistent, repeated, linked to pregnancy, or paired with dehydration, belly pain, or a new medicine, a clinician may order blood, urine, stool, or pregnancy tests.
Should I use ginger ale or broth after vomiting?
Use whichever clear liquid you can keep down, because the main goal is fluid and salt replacement. Broth can add sodium. Ginger ale is not a treatment for vomiting, and carbonated drinks are worth avoiding if they make nausea worse.
When is vomiting an emergency?
It is an emergency if vomiting comes with chest pain, trouble breathing, confusion, fainting, signs of stroke, severe dehydration, a possible overdose or poisoning, sudden severe abdominal pain, a rigid belly, blood in the vomit, black or bloody stools, or signs of anaphylaxis.
10 · References
References and supporting evidence
These sources support the points identified below. Source checking is not clinical approval.
- S1: Nausea and VomitingMedlinePlus / U.S. National Library of Medicine
Explains that nausea and vomiting have many possible causes, including pregnancy, infection, migraine, motion sickness, food poisoning, and medicines. Explains urgent warning signs and the 24-hour vomiting threshold, plus dehydration signs that need prompt evaluation. Explains practical home care steps for tolerating fluids and food while nausea and vomiting are settling.
- S2: GastroenteritisMedlinePlus / U.S. National Library of Medicine
Explains that gastroenteritis commonly causes vomiting and diarrhea and that dehydration is a key complication. Explains that pregnant people, older adults, people with weakened immune systems, and infants need earlier attention.
- S3: PancreatitisMedlinePlus / U.S. National Library of Medicine
Explains that pancreatitis is serious and can present as a more dangerous cause of nausea and vomiting. Explains the symptom pattern and that serious causes like pancreatitis may need hospital treatment.
General information, not a diagnosis. This guide is not a substitute for care from a qualified healthcare professional. For an emergency, call 911 in the US or your local emergency number. Illustrations are conceptual and are not diagnostic images.