Food poisoning: When should you go to the hospital?

Most food poisoning resolves at home within 1 to 3 days. Go to the hospital — the ER specifically — if you have bloody diarrhea, a fever over 102°F, vomiting that keeps you from holding down fluids, signs of severe dehydration, or any neurologic symptoms like blurred vision, slurred speech, or muscle weakness.^1,2 When in doubt, urgent care is a fast, lower-cost step before the ER for moderate symptoms.

What is food poisoning?

Food poisoning is illness caused by eating or drinking something contaminated with harmful bacteria, viruses, parasites, or toxins. Common culprits include norovirus, Salmonella, E. coli, Campylobacter, and Listeria. Symptoms typically start 30 minutes to a few days after exposure and include nausea, vomiting, diarrhea, abdominal cramps, fever, and sometimes headache or muscle aches.³

When should you go to the ER for food poisoning?

The CDC and Mayo Clinic identify five red-flag symptoms that mean it's time for emergency care:^1,2

• Bloody diarrhea or stool that looks black or tarry
• Fever above 102°F (38.9°C)
• Vomiting that prevents you from keeping any liquid down for more than a few hours
• Signs of severe dehydration: very little urine output, dry mouth and throat, dizziness when standing, rapid heartbeat, or confusion
• Diarrhea that lasts more than 3 days

Call 911 — do not drive yourself — for blurred vision, drooping eyelids, slurred speech, difficulty swallowing, muscle weakness, or trouble breathing. These can signal botulism or another life-threatening illness.¹

When is urgent care the right choice?

Urgent care is well suited for moderate cases that need medical attention but not emergency-level resources:

• Persistent vomiting or diarrhea lasting more than 24 to 48 hours
• Mild to moderate dehydration (dry mouth, fatigue, low urine output) without confusion or fainting
• Fever between 100.4°F and 101.9°F that is not improving
• Suspected food poisoning in someone who is otherwise healthy and not in a high-risk group

Urgent care providers can prescribe anti-nausea medication, give IV fluids in some clinics, order stool testing if needed, and refer you to the ER if your symptoms worsen.

Who is at higher risk and should seek care earlier?

Some groups are far more likely to develop severe complications and should not wait it out:³

• Infants and young children
• Adults 65 and older
• Pregnant patients (Listeria can cross the placenta)
• People with diabetes, chronic kidney or liver disease, HIV/AIDS, or active cancer treatment
• Anyone on immunosuppressing medication

For these patients, the threshold for medical evaluation is much lower — even moderate vomiting and diarrhea, or a fever over 100.4°F, is worth a call.

How can I treat food poisoning at home?

For mild cases without red flags, home care is straightforward:

• Hydrate aggressively. Sip oral rehydration solution like Pedialyte, Ceralyte, or Oralyte. Sports drinks have too much sugar and not enough electrolytes, and water alone does not replace sodium losses.⁴
• Rest the gut. Avoid solid food until vomiting stops, then advance slowly with bland items (bananas, rice, applesauce, toast).
• Skip dairy, caffeine, alcohol, and fatty foods for 24 to 48 hours after symptoms resolve.
• Use OTC medication carefully. Loperamide (Imodium) can help simple watery diarrhea, but should be avoided if you have bloody stools, high fever, or suspected bacterial infection.⁴
• Wash hands well with soap and water — alcohol-based sanitizer does not kill norovirus.

Signs of dehydration to watch for

Dehydration is the most common reason food poisoning sends people to the hospital. Watch for:^1,2

• Going more than 8 hours without urinating, or very dark urine
• Dry mouth, dry tongue, no tears when crying (in children)
• Dizziness or lightheadedness when standing
• Rapid heartbeat or rapid breathing
• Sunken eyes or, in infants, a sunken soft spot on the head
• Confusion, extreme fatigue, or fainting

Severe dehydration is a medical emergency — head to the ER for IV fluids.

How do I avoid food poisoning?

The CDC's four core food safety rules cover most prevention:⁵

• Clean: wash hands and surfaces often
• Separate: keep raw meats away from ready-to-eat foods
• Cook: use a thermometer; chicken to 165°F, ground beef to 160°F, fish to 145°F
• Chill: refrigerate perishables within 2 hours (1 hour above 90°F)

Next steps

If you have any of the red-flag symptoms above, head to the ER. For moderate symptoms or if you're in a high-risk group, urgent care is a faster, lower-cost option. Solv lets you check wait times and book a same-day urgent care visit near you.