Most food poisoning shows up as diarrhea and stomach cramps, usually with nausea, vomiting or a fever. The symptoms of food poisoning can start 30 minutes after a meal or two weeks later, depending on the germ, which is why people so often blame the wrong dinner.
The CDC estimates that 48 million people in the US get sick from foodborne illness each year, and 128,000 of them end up in the hospital. Most recover on their own, according to the National Institute of Diabetes and Digestive and Kidney Diseases. A few need care fast, and Alaska adds two risks that national checklists rarely cover. Here’s how to tell which situation you’re in.
When do symptoms start? The clock points to the germ
Timing is the best clue you have, and the CDC publishes onset windows for each germ.
The fast ones come first. Staph (Staphylococcus aureus) can make you sick within 30 minutes to 8 hours, and Vibrio within 24 hours. Clostridium perfringens takes 6 to 24 hours, norovirus 12 to 48.
Then the slow ones. Salmonella covers the widest range, from 6 hours to 6 days. Campylobacter needs 2 to 5 days and E. coli 3 to 4. Cyclospora takes about a week, and invasive Listeria about two weeks.
That spread changes how you read your own week. If symptoms start Thursday morning, Tuesday’s chicken may be a better suspect than Wednesday’s sandwich.
One gap in the data: the CDC gives a duration for only one germ. Diarrhea and cramps from C. perfringens pass in under 24 hours. For everything else, the agency says only that illness can last from a few hours to several days.
Signs and symptoms of food poisoning you can expect
The CDC lists diarrhea, stomach pain or cramps, nausea and vomiting, plus fever, as the common ones. NIDDK adds headache and notes that diarrhea is sometimes bloody. Most cases come from viruses, bacteria or parasites, and harmful chemicals cause some.
You usually can’t tell food poisoning from a stomach bug at home. Cedars-Sinai says confirmation takes a doctor’s exam or a stool sample, though your body gives clues. NIDDK adds that doctors often diagnose from symptoms alone, and mild, short cases rarely need tests.
One more clue: nausea that keeps coming back after the same food points toward a food sensitivity rather than poisoning.
When it stops being a stay-home illness
The CDC says to see a doctor if any of these symptoms of food poisoning show up:
- Bloody diarrhea
- Diarrhea lasting more than 3 days
- A fever over 102°F
- Vomiting so frequent you can’t keep liquids down
- Signs of dehydration
- Pregnancy with a fever and other flu-like symptoms
Dehydration is the one to watch. You urinate very little and your mouth and throat feel dry. Standing up makes you dizzy.
The pregnancy line isn’t a formality. According to the CDC, a Listeria infection during pregnancy can lead to miscarriage, stillbirth, premature delivery or a life-threatening infection in the newborn.
Young children, older adults and anyone with a weakened immune system should not wait out day three. NIDDK says to call a doctor promptly when a child has vomiting or diarrhea, and Cedars-Sinai says these groups should be seen as soon as symptoms begin. Complications such as severe dehydration or paralysis need hospital care.
Alaska has two food risks you won’t find on a national checklist
Raw oysters. In summer 2004, 62 cruise ship passengers got sick after eating raw oysters from a Prince William Sound farm, Alaska Public Media reported in 2026. It was the northernmost Vibrio parahaemolyticus illness known in North America at the time. The germ needs water around 59°F (15°C) to stay active, and warming Alaska waters are the concern.
Since 2004 the state has required temperature monitoring at harvest sites and fast cooling for oysters harvested between June 15 and September 15. Alaska reported 7 cases in 2024, the latest year with data. The state epidemiologist says the risk is very low for anyone who skips raw oysters, though not zero. Keep that in proportion: a handful of cases a year is small.
Botulism from fermented foods. Foodborne botulism is rare, but Alaska carries an outsized share. A CDC report counted 226 cases from 114 outbreaks in Alaska between 1950 and 2000, all in Alaska Natives, and put the state at about 27% of US foodborne botulism cases. Every case with a known cause traced back to fermented food, including the 2001 outbreak, where the source was fermented beaver tail and paw stored in a closed rice sack in a warm area. That count ends in 2000, so read it as history, not today’s rate.
Botulism looks nothing like a normal stomach bug. It starts with double vision, slurred speech, trouble swallowing, a dry throat and pupils that stay dilated and fixed. Death usually comes from respiratory failure. Symptoms typically begin 12 to 36 hours after eating (the range runs from 6 hours to 10 days), so if you notice those signs after eating fermented or improperly canned food, call 911.
Treatment: what helps at home and what to skip
NIDDK ranks replacing lost fluids and electrolytes as the most important treatment. If you’re vomiting, take small, frequent sips of clear liquids. Most adults do fine with water, diluted fruit juice, sports drinks or broth, and saltine crackers help replace electrolytes.
Older adults, people with weakened immune systems and anyone with severe diarrhea or signs of dehydration should use an oral rehydration solution such as Pedialyte. Once your appetite returns, you can go back to your normal diet, even if diarrhea continues. Infants keep their usual breast milk or formula, and a doctor should weigh in before you give an infant a rehydration solution.
Adults can use loperamide (Imodium) or bismuth subsalicylate (Pepto-Bismol) for the diarrhea, but not when there’s blood in the stool or a fever, which suggest a bacterial or parasitic infection that needs a doctor. Don’t give either medicine to a child without asking first. Antibiotics only help bacterial infections and antiparasitic drugs only help parasites, so a clinician has to decide.
Where a video visit fits
If your symptoms are mild to moderate and you can’t decide whether to wait or go in, a video visit gets you a clinician’s read without a drive. At Telemedicine Alaska you see a nurse practitioner by video from your phone or computer. The provider decides whether your illness can be handled remotely, and you can learn more about the practice on our About Us page.
A visit costs a flat $60 with no insurance needed, or $100 for a family consultation that covers immediate blood relatives in one appointment. We can’t run stool tests or imaging over video, so if you need an exam or a test, we refer you to in-person care. Prescriptions are possible when appropriate, but you must be able to pick them up at an Alaska pharmacy, and you must be physically in Alaska, Arizona, Colorado or Wyoming during the visit.
Our services page lists what we see, and you can contact us to ask whether your symptoms fit. Weighing a walk-in clinic instead? We compared the two in AFC Urgent Care vs. Telemedicine Alaska. Anchorage readers can also see our page on telemedicine in Anchorage.
Call 911 for trouble breathing, double vision, slurred speech or trouble swallowing. Distances in Alaska are long, so call early.
Cook it to the number
Prevention comes down to a thermometer. The USDA’s safe temperature chart sets the minimums.
Poultry needs 165°F and ground meat 160°F. Whole cuts of beef, pork, veal or lamb need 145°F plus at least 3 minutes of rest, the same temperature as fish and shellfish. Leftovers and casseroles go back to 165°F, and egg dishes reach 160°F.
If you think a restaurant or packaged food made you sick, Cedars-Sinai advises reporting it to your local health department.
Before you talk to anyone, jot down what you ate and the hour your symptoms began. The onset windows above only help when you know the clock.
