Watery diarrhea that will not quit, stomach cramps, and the kind of tiredness that makes getting off the couch feel like a workout. You know something is wrong, but you have no idea whether to ride it out or get checked. Food poisoning, Cyclospora, and a common stomach virus can look nearly identical on the first day, yet they start at different times, last for different lengths, and are treated in different ways. With a cyclosporiasis outbreak affecting Southeast Michigan through 2026, diarrhea that drags on or keeps returning deserves a closer look.
Here is how to read your symptoms and know when testing makes sense.
In the first 24 hours, these three illnesses are tough to tell apart. Nausea, cramping, and diarrhea show up in all of them, so the early symptoms alone will not point you to the cause.Three clues do most of the work: when your symptoms started, how long they stick around, and whether they steadily improve or fade and then come back. Food poisoning tends to hit fast and ease within a few days. A stomach virus follows a similar short arc. Cyclospora is the slow one, often appearing about a week after exposure and lingering or relapsing without the right treatment.
| Feature | Food Poisoning | Cyclospora | Stomach Virus |
|---|---|---|---|
| When symptoms start | Often within hours of eating contaminated food | Usually days to 2 weeks after exposure | Usually 12 to 48 hours after exposure |
| How long symptoms last | Often 1 to 3 days | Can last weeks without treatment | Usually 1 to 3 days |
| Typical pattern | Sudden onset, then improvement | May improve and return | Peaks, then gradually improves |
| Fever | Common | Low-grade or absent | Low-grade fever may occur |
| Blood in stool | Possible | Uncommon | Rare |
| Fatigue | Moderate | Can be significant and prolonged | Moderate |
| Prescription treatment | Sometimes | May require prescription treatment | Usually not needed |
| Person-to-person spread | Depends on the cause | Generally not spread between people | Common |
Food poisoning can come on fast, sometimes within a few hours of eating, though the timing depends on the specific bacteria, virus, or toxin involved. Common culprits include undercooked meat, raw or undercooked eggs, contaminated produce, and food left too long at unsafe temperatures.
Symptoms usually arrive suddenly and often include nausea, vomiting, watery diarrhea, and stomach cramps. A fever is common, and depending on the cause, you may notice blood in the stool.
Get medical care if you have a high fever, blood in your stool, signs of dehydration, severe or worsening belly pain, or symptoms that do not improve after a few days. Young children, older adults, pregnant patients, and anyone with a weakened immune system should be seen sooner.
Most cases improve with rest, fluids, and electrolytes while your body clears the infection. Some bacterial causes call for antibiotics, and a stool test can help identify when that is the case.
Cyclospora rarely shows up right after exposure. Symptoms typically begin about a week after you swallow the parasite, though the delay can range from a few days to two weeks. That lag is one reason people do not link the illness to a meal they ate days earlier.
The hallmark is frequent, watery diarrhea that keeps you close to a bathroom. Other common symptoms include:
Left untreated, Cyclospora can cause diarrhea that lasts for weeks, often in a frustrating cycle: you start to feel better, then symptoms return. That come-and-go pattern is a strong signal to get evaluated rather than wait it out.
Cyclospora does not show up on a standard stool panel unless it is specifically requested, so the test has to be ordered on purpose. Providers use ova-and-parasite testing or molecular (PCR) testing to confirm it. Tell your provider about ongoing diarrhea, any recent travel, and any fresh produce that could have been contaminated.
Cyclospora usually will not clear reliably on its own. It calls for a specific prescription antibiotic, guided by your provider and appropriate testing.
Walk In Today: On-Site Lab Services for Ongoing GI Symptoms
If watery diarrhea has lasted more than a few days or keeps coming back, our urgent care team can evaluate you and collect samples for testing during the same visit.
Viral gastroenteritis, the illness most people call a stomach bug, usually runs its course within a few days. The exact length varies with the specific virus and your overall health, but the trend is toward steady improvement, not a drawn-out or returning illness.
A stomach virus often brings nausea, vomiting, diarrhea, and stomach cramps, sometimes with a low-grade fever and body aches. Symptoms tend to peak early and then ease day by day.
The biggest difference is how it spreads. Stomach viruses pass easily from person to person, so household members, classmates, or coworkers often get sick within a day or two. Food poisoning usually traces back to a specific food rather than a sick contact, and it often starts faster than a virus, which typically takes 12 to 48 hours to appear.
Seek care if you cannot keep fluids down, show signs of dehydration, run a high fever, or have severe belly pain. Symptoms that last longer than expected or keep returning are also worth a visit, especially for young children, older adults, and people with underlying conditions.
Focus on fluids and electrolytes, rest, and bland foods as you can tolerate them. Skip antibiotics unless a provider prescribes them, since they do nothing for a viral infection.
As a general rule, watery diarrhea that lasts more than a few days without improving deserves medical attention. Symptoms that stretch past that window, or keep returning after a brief break, should not be brushed off as a simple stomach bug during an active Cyclospora outbreak.
Not always. Many cases resolve before testing would change anything. A provider weighs your symptoms, how long they have lasted, how severe they are, and your likely exposures before recommending a stool test.
Consider testing for Cyclospora if:
The right test depends on the suspected cause. A stool culture looks for bacterial infections, parasite testing checks for organisms like Cyclospora, and molecular or PCR-based panels can detect a range of pathogens at once.
You can walk in or hold your spot online, then talk through how long your symptoms have lasted and how severe they feel. Share recent meals, travel, and any possible Cyclospora exposure so the right tests are ordered. On-site lab services keep collection and evaluation in one visit.
Most stomach illnesses pass on their own, but diarrhea that lingers or keeps circling back is exactly the kind of symptom worth taking seriously right now. At MI Express Urgent Care & Primary Care, we can evaluate your symptoms, order the right tests, and help you feel like yourself again.
Walk in or visit us at our Canton or Ann Arbor urgent care location, no appointment required.
Yes. It is possible to pick up more than one infection from contaminated food, and overlapping symptoms can make it hard to tell. Testing is the clearest way to sort out what is going on.
Sometimes the timing and pattern offer clues, but overlapping symptoms make guessing unreliable. Persistent or relapsing diarrhea in particular often needs a test to confirm whether Cyclospora is the cause.
Yes. Urgent care providers can evaluate your symptoms, collect a stool sample, and order the appropriate tests, including parasite testing when Cyclospora is a concern.
It depends on the test. A basic stool culture may take a couple of days, while parasite and PCR-based testing can take several days, since these samples are often processed at an outside lab.
Urgent care handles most cases, including dehydration and diarrhea that will not quit. Head to the ER for severe warning signs such as heavy blood in the stool, a very high fever, confusion, fainting, or intense, unrelenting abdominal pain.
