Find relief from sudden stomach pain, persistent nausea, or troubling digestive symptoms at Advanced Urgent Care of Pasadena. If you’re dealing with diarrhea, vomiting, bloating, or severe acid reflux, don’t wait it out—walk in today. Our experienced team is here to diagnose and treat your gastrointestinal illness without the wait.
Visit Us Promptly for Your
Gastrointestinal Illnesses
Gastrointestinal illnesses refer to a range of conditions that affect your digestive tract, including your stomach, intestines, and related organs. These illnesses can be caused by infections, inflammation, poor diet, or underlying medical conditions. Common gastrointestinal illnesses include diarrhea, gastritis, colitis, and acid reflux, and they may lead to stomach pain, cramping, bloating, nausea, vomiting, or changes in bowel habits. Prompt care ensures faster relief and helps prevent complications. We’re here to help you feel better, fast.
Signs Indicating You Need to Visit Urgent Care:
- Severe abdominal pain that does not improve
- Diarrhea lasting more than two days
- Vomiting that includes blood or occurs frequently
- Dehydration signs such as dizziness or dry mouth
- Blood present in stool
- High fever with digestive symptoms
- Unexplained or rapid weight loss
- Intense bloating or cramping that disrupts daily life
GI-Related Conditions We Treat:
- Diarrhea: Diarrhea involves frequent, loose, or watery bowel movements and may be caused by infections, food intolerance, or underlying illness. If left untreated, it can lead to dehydration and fatigue. Our team can help identify the cause and provide fast relief.
- Gastritis: Gastritis is the inflammation of the stomach lining, often due to infection, alcohol use, or certain medications. It can cause burning pain, nausea, and indigestion. We offer evaluation and treatment options to reduce inflammation and manage symptoms.
- Colitis: Colitis refers to inflammation of the colon, which may be caused by infection, autoimmune conditions, or ischemia. At our clinic, we assess the severity of the condition and help you manage flare-ups. Prompt care can prevent complications and provide lasting relief.
- Heartburn/Acid Reflux: This condition occurs when stomach acid flows back into the esophagus, causing a burning sensation in the chest. It may be occasional or a sign of gastroesophageal reflux disease (GERD). We help determine the cause and offer treatment options ranging from lifestyle changes to medications.
- General gastrointestinal disorders: We treat many GI issues, including nausea, bloating, indigestion, and abdominal discomfort. These symptoms can signal various conditions, from viral infections to functional disorders like IBS. Our providers perform thorough evaluations to pinpoint the cause and recommend personalized treatment.
Common Services We Offer for Gastrointestinal Illnesses
At Advanced Urgent Care of Pasadena, we take a thorough approach to diagnosing and treating gastrointestinal issues. When you arrive, our providers begin with a detailed medical history and symptom review. We may perform a physical exam, order lab work, or use in-house imaging such as X-rays. Rapid tests and same-day results help us determine the underlying cause of your symptoms quickly. From there, we tailor a treatment plan to relieve discomfort and support your recovery. Walk in for same-day, comprehensive GI care.
These are some of the services we may offer for gastrointestinal illnesses:
- Physical exams to assess abdominal tenderness and symptoms
- Lab tests to check for infections or inflammation
- On-site imaging, like X-rays
- Prescription medications for acid reflux, pain, or infections
- Recommending dietary changes or follow-up care based on diagnosis
2026 Cyclospora Outbreak: What Our Patients Should Know
The United States is experiencing its largest Cyclospora outbreak on record. Since May 1, 2026, more than 17,000 laboratory-confirmed cases of cyclosporiasis have been reported nationwide — roughly fifteen times the number seen over the same months last year — with the largest cluster (more than 11,000 cases across 20 states) linked by the CDC and FDA to processed iceberg lettuce, and several additional clusters still under investigation.
Cyclospora is a microscopic parasite spread through contaminated fresh produce. It causes watery diarrhea that can last for weeks and tends to relapse, along with cramping, bloating, loss of appetite, fatigue, and weight loss. Unlike most stomach bugs, it usually does not get better on its own quickly — and it responds to a specific antibiotic, so testing is worth doing. We can test for Cyclospora and other GI pathogens through our on-site laboratory and start treatment the same day.
Read our full guide: The 2026 Cyclospora Outbreak — what happened, symptoms, testing, and treatment.
And a year-round reminder: norovirus never really leaves
While outbreak headlines come and go, norovirus remains endemic — it circulates every year and is the most common cause of acute vomiting-and-diarrhea illness in the U.S., spreading rapidly through households, schools, and workplaces (especially in the late fall and winter). It typically strikes fast, with prominent vomiting, and passes in one to three days; the main risk is dehydration. If you or your child cannot keep fluids down, are showing signs of dehydration, or symptoms last beyond a few days, walk in and let us evaluate, test, and rehydrate — no appointment needed.
Why Choose Advanced Urgent Care of Pasadena?
Advanced Urgent Care of Pasadena offers prompt, compassionate care for gastrointestinal symptoms. Our experienced team understands how uncomfortable and concerning digestive issues can be, and we’re committed to providing accurate diagnoses and effective treatments—all in one convenient visit. With a focus on affordability, efficiency, and comfort, we make it easy to get the help you need without the long wait or high cost of the emergency room.
Here’s why you should choose Advanced Urgent Care of Pasadena:
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- Same-day care with shorter wait times
- In-house lab testing and X-rays for faster results
- Personalized treatment plans tailored to your symptoms
- We work with patients on pricing to keep care affordable
- Staffed by experienced providers who listen and care
- Conveniently located in Pasadena with easy walk-in access
- Equipped to treat both adults and children with GI concerns
- Walk in—no appointment needed. We welcome you anytime during business hours.
- Whether your symptoms started today or have been lingering, we’re here when you need us.
Frequently Asked Questions
How long should a stomach bug last before I get tested?
Most viral bugs settle within a few days. Diarrhea lasting more than about a week — or that improves and relapses — deserves stool testing, especially during the current Cyclospora outbreak.
Can you test for parasites like Cyclospora?
Yes — we can collect a stool sample during your visit and order molecular GI panels or targeted parasite testing through our on-site lab.
Do I need an appointment?
No — we are a true walk-in clinic. Just come in during business hours and you'll be seen. If you prefer, you can also reserve a time online through our booking page.
What are your hours?
Monday through Friday 8:00 AM – 8:00 PM, and Saturday–Sunday 9:00 AM – 5:00 PM. We take our last patient 30 minutes prior to close.
Do you take my insurance?
We accept most major insurance plans, and we offer affordable self-pay pricing if you're uninsured or between plans. See our Accepted Insurances page for the current list, or call (626) 304-0404 and we'll check for you.
Where do I park?
We're at 797 S Arroyo Pkwy in Pasadena, near Huntington Hospital, with free on-site parking. The Metro A Line Fillmore Station is about a block away.
