Thousands of cyclosporiasis cases have been reported across the country this summer. One large outbreak in five states has been linked to recalled iceberg lettuce, while public health officials keep investigating other cases and clusters that may have different sources. As of July 20, 2026, the CDC had confirmed 4,173 domestically acquired cases and was investigating more than 7,400 additional reports that were not yet laboratory confirmed.
What makes this infection worth a closer look is not only how many people it has sickened. It is how long the illness can last. Cyclospora can cause watery diarrhea that runs for weeks and eases only to flare up again. Because symptoms can fade and then return, it is easy to lose track of when an ordinary stomach illness has turned into something that deserves medical attention.
That uncertainty points to a bigger issue we see all the time, outbreak or not. When diarrhea drags on, many people reach for a familiar explanation. It was something I ate. There’s a bug going around. It’s stress. It’s probably just my IBS acting up. Sometimes those hunches are right. The trouble is that you cannot tell which one you have from the bathroom. Some causes clear on their own, and others call for testing, targeted treatment, or ongoing care.
Prolonged diarrhea is a symptom, not a diagnosis
Doctors sort diarrhea partly by how long it lasts. Acute diarrhea runs less than two weeks. Persistent diarrhea lasts two to four weeks, and chronic diarrhea continues beyond that. An infection usually falls in the acute or persistent range, though some, including untreated cyclosporiasis, can last longer. Conditions such as IBS, celiac disease, and inflammatory bowel disease tend to recur or persist over months.
Acute infections like Cyclospora and Giardia can cause watery, urgent diarrhea. So can IBS, celiac disease, inflammatory bowel disease, a reaction to a medication, and other digestive conditions. The timelines and treatments differ, but several of them look alike in the early weeks. Telling them apart takes a medical history and, when it fits the picture, targeted testing rather than guesswork.
Cyclospora shows why the right test matters. It is not included in every routine stool test or gastrointestinal panel, so a clinician may need to order testing that looks for the parasite specifically. Other conditions can go unexamined for the opposite reason, when recurring symptoms are assumed to be stress or an old familiar problem and no one asks whether the pattern has shifted.
You can make that first visit more useful by coming prepared. Tell your provider about recent restaurant meals, any recalled lettuce, travel, and what you ate in the two weeks before symptoms started, since that history helps point to the cause.
When to see a doctor, and when to get help now
Make an appointment
Reach out to a provider when diarrhea lasts more than a few days, keeps returning, or is frequent or getting worse, or when it comes with:
- Unexplained weight loss or unusual fatigue
- Diarrhea that wakes you at night
- A high or persistent fever
- Symptoms in someone who is pregnant, older, immunocompromised, or otherwise medically vulnerable
Get help now
Some symptoms should be seen right away, at urgent care or an emergency room rather than a scheduled visit:
- Heavy or ongoing blood in the stool, or stools that look black and tarry
- Not being able to keep fluids down, or very little urination
- Fainting or confusion
- Severe or worsening belly pain
- IBS and stress are real. Self-diagnosis is the risk.
Stress genuinely affects the gut, and IBS is one of the most common conditions we treat. So this is not about talking you out of either. The point is narrower. IBS is a real disorder that a clinician can often identify from its characteristic pattern of symptoms. Even then, a clinician still needs to weigh your medical history, age, and any warning signs that could point to another cause. When you settle on an answer too early, you may put off the evaluation that would confirm it or turn up something else.
What a GI evaluation actually changes
A gastroenterologist can review the timing and pattern of your symptoms, recent meals or travel, medications, health history, and any warning signs. That picture guides whether you need stool testing, bloodwork, a colonoscopy, or another kind of evaluation.
The result may be targeted treatment for an infection, a care plan for an ongoing condition, or reassurance based on what the findings show. The goal is not to test for everything. It is to choose the next step based on the most likely causes, so you stop guessing.
Talk to the team at GI Consultants
For heavy bleeding, black tarry stool, serious dehydration, or severe abdominal pain, seek urgent or emergency care. For diarrhea that lasts more than a few days, keeps returning, or comes with other lingering symptoms, the board-certified gastroenterologists at GI Consultants in Reno can help find the cause and recommend the next step. Call our North Reno office at 775-329-4600 or our South Meadows office at 775-852-4848 to schedule a visit.
This article is for general information and is not a substitute for medical advice. Outbreak figures are current as of July 20, 2026, and will change as investigations continue. For the latest numbers, see the CDC cyclosporiasis outbreak page.
