Nausea and Vomiting: When to Go to Urgent Care

Nausea and vomiting can range from a minor stomach bug to a sign of something more serious. Knowing when to seek urgent care for nausea and vomiting — and when to head to the ER — can make a real difference. CityHealth San Leandro offers same-day urgent care for nausea and vomiting, including IV fluids and anti-nausea medications.

Common Causes of Nausea and Vomiting

Nausea and vomiting are symptoms, not diagnoses. The cause determines the treatment. Common culprits include:

• Viral gastroenteritis (“stomach flu”) — the most common cause; nausea, vomiting, diarrhea, low-grade fever, usually lasts 24–72 hours
• Food poisoning — typically faster onset (1–6 hours after eating), cramping, vomiting, diarrhea; usually resolves within 24 hours but can be severe
• Norovirus — highly contagious, forceful vomiting, watery diarrhea, resolves in 1–3 days but is very unpleasant
• Motion sickness or vertigo — triggered by movement or inner ear issues
• Medications — antibiotics, opioids, chemotherapy drugs, and others can cause significant nausea
• Migraine — nausea is a hallmark of migraine headaches
• Pregnancy (morning sickness) — especially in the first trimester
• GERD / acid reflux — chronic nausea that worsens after meals
• Kidney stones — severe flank pain plus nausea is a classic presentation
• Appendicitis — nausea with right lower abdominal pain, fever, and loss of appetite is a red flag
• Concussion — nausea following a head injury needs evaluation

When to Go to Urgent Care for Nausea and Vomiting

Most cases of nausea and vomiting from stomach bugs or food poisoning resolve on their own with rest, hydration, and time. But urgent care is the right call when:

• Vomiting for more than 24 hours without improvement in adults; more than 12 hours in young children
• Signs of dehydration — dry mouth, dark urine, dizziness when standing, no urination for 8+ hours, weakness
• Unable to keep down any fluids for 6+ hours
• Fever above 101.5°F with vomiting (possible bacterial infection)
• Vomiting with severe abdominal pain — needs evaluation to rule out appendicitis, bowel obstruction, or kidney stones
• Blood in vomit — coffee-ground appearance or bright red blood
• Vomiting after a head injury — possible concussion
• Suspected food poisoning affecting multiple people
• Nausea during pregnancy with inability to keep fluids down — hyperemesis gravidarum can require IV fluids
• Diabetic patients with vomiting — possible diabetic ketoacidosis (DKA)

Related: Urgent Care for Abdominal Pain

What Urgent Care Can Do for Nausea and Vomiting

Coming to CityHealth for nausea and vomiting means you’re not just getting “drink fluids and rest” advice. Providers can:

For same-day treatment, visit urgent care in San Leandro at CityHealth — walk-ins welcome 7 days a week.

• Assess dehydration severity and determine if IV fluids are needed
• Prescribe anti-nausea medication — ondansetron (Zofran), promethazine, or metoclopramide to break the vomiting cycle
• Administer IV fluids if you’re significantly dehydrated (available at CityHealth)
• Run lab work — basic metabolic panel to check electrolytes, kidney function, and blood glucose
• Evaluate for serious causes — abdominal exam, history, and targeted testing to rule out appendicitis, kidney stones, or other urgent conditions
• Test for flu and COVID if respiratory symptoms are present alongside GI symptoms
• Provide a diagnosis and follow-up plan

Signs of Dehydration — Know These

Dehydration is the main complication of prolonged vomiting. Your body loses significant fluid with every vomiting episode, and if you can’t replace it orally, it can escalate quickly. Symptoms of dehydration include:

• Dry mouth and throat
• Dark yellow or brown urine (or no urination)
• Dizziness or lightheadedness when standing up
• Rapid heart rate
• Headache
• Confusion or unusual sleepiness
• Sunken eyes (especially in children)
• In infants: no wet diapers for 6+ hours, no tears when crying

Moderate to severe dehydration typically requires IV fluid replacement — something urgent care handles routinely and much faster than the ER.

When Is Nausea and Vomiting an Emergency?

Go to the ER — not urgent care — if you have:

• Vomiting bright red blood or large amounts of coffee-ground material
• Severe abdominal pain that is constant, getting worse, and not crampy (possible surgical emergency)
• Signs of shock — pale/gray skin, cold clammy skin, rapid weak pulse, confusion
• Suspected poisoning or overdose
• Vomiting with chest pain — could be a cardiac event
• Vomiting following a significant head injury with loss of consciousness

Food Poisoning vs. Stomach Bug: Does It Matter?

Practically speaking, mild-to-moderate food poisoning and viral gastroenteritis are treated the same way: rest, fluids, and letting your body fight it off. The distinction matters more in severe cases:

• Certain bacterial food poisonings (Salmonella, Campylobacter, E. coli O157) can be serious and sometimes warrant antibiotics
• Listeria — serious in pregnant women, elderly, and immunocompromised
• Botulism — rare but life-threatening; vomiting plus weakness or vision changes needs ER
• Norovirus — no specific treatment, but very contagious; handwashing critical

If you ate something specific that got multiple people sick, or you’ve had severe vomiting for more than 24 hours, come in so we can determine if this is something that needs targeted treatment.

Tips to Manage Nausea at Home

While waiting to see if your nausea resolves, or while recovering after a provider visit:

• Sip clear fluids slowly — small amounts frequently, not large glasses; try water, Pedialyte, broth, or diluted sports drinks
• Ice chips or popsicles — easier to keep down than liquid
• BRAT diet (when able to eat): Bananas, Rice, Applesauce, Toast — easy on the stomach
• Ginger — ginger tea, ginger ale, or ginger chews have evidence-backed anti-nausea properties
• Avoid dairy, fatty, spicy foods until fully recovered
• Rest upright — lying flat can worsen nausea; a slight incline helps
• Avoid screens and bright lights if your nausea has a migraine component

Get Evaluated at CityHealth

If your nausea and vomiting has lasted more than a day, you can’t keep fluids down, or you’re feeling significantly worse, don’t wait it out alone. CityHealth provides same-day evaluation at our Oakland Montclair and San Leandro locations. We can assess dehydration, give you anti-nausea medication, administer IV fluids if needed, and rule out anything serious.

Resources: CDC — Foodborne Illness Symptoms

Related: dizziness and vertigo