Medically reviewed by the clinical team at Immediate Care Center of Westmont · Published July 23, 2026 · Last reviewed July 23, 2026
A sore throat is one of the most common reasons people walk into Immediate Care Center of Westmont. The question almost everyone asks is the same: “Is this just a regular sore throat, or is it strep?” It is a smart question, because the answer changes what you should do. Most sore throats are viral and get better on their own, while strep throat is bacterial and needs antibiotics. As a walk-in urgent care serving Westmont, Downers Grove, Hinsdale, Oak Brook, Darien, Clarendon Hills, Willowbrook, La Grange, Villa Park, and the rest of DuPage County, we help patients sort this out every day — with an exam and, when needed, on-site rapid strep testing that gives answers in minutes.
Here is the single most important fact: the majority of sore throats are caused by viruses, not bacteria. Common culprits include the viruses behind colds, the flu, COVID-19, and other respiratory infections. Because they are viral, these sore throats do not respond to antibiotics. They typically improve on their own within several days with rest, fluids, and symptom relief.
Strep throat, by contrast, is caused by a specific bacterium — group A Streptococcus. It accounts for a minority of sore throats overall, though it is more common in school-age children. Because it is bacterial, strep responds to antibiotics, and treating it lowers the risk of complications and shortens how long you are contagious. The challenge is that a viral sore throat and strep can look and feel similar in the early hours, which is exactly why testing exists.
While no symptom checklist is a substitute for a test, certain patterns point more toward one cause than the other. The most useful clue is often which symptoms are missing.
As a rule of thumb echoed by major medical organizations: when a sore throat arrives with a cough, runny nose, hoarseness, or pink eye, a virus is the more likely cause. When it arrives without those cold symptoms but with fever and swollen neck glands, strep becomes more likely. Still, these are probabilities, not proof.
It is a common belief that a doctor can tell strep just by looking at white spots on the tonsils. In reality, viral infections can also cause red, swollen tonsils with white patches, and some people with true strep have relatively mild-looking throats. Studies consistently show that even experienced clinicians cannot reliably distinguish strep from viral sore throat on appearance alone. That is why the standard of care is a swab test, not a visual guess. Our providers evaluate your symptoms and, when the picture suggests it, confirm with a test rather than prescribing antibiotics blindly.
At our two Westmont clinics, testing is quick and done on-site:
Because we have an on-site lab, most patients get their answer during the same visit. If your symptoms actually point to the flu, COVID-19, or another respiratory illness, we can test for those too — we offer flu, COVID, and RSV testing under the same roof, so you leave knowing what you are dealing with.
Testing before treating protects you in both directions. If you have strep, a confirmed diagnosis means you get the antibiotics that shorten the illness, reduce contagiousness, and lower the small risk of complications such as rheumatic fever. If you have a virus, testing spares you antibiotics you do not need — drugs that would not help, could cause side effects, and contribute to antibiotic resistance when overused. Either way, you get a plan that fits the actual cause. For care beyond a sore throat, our walk-in urgent care team handles a wide range of everyday illnesses and injuries.
If testing points to a virus, these steps ease symptoms while your body recovers:
Come in for evaluation and a strep test if you or your child has a sore throat with fever, swollen neck glands, white patches on the tonsils, no cough or runny nose, a known strep exposure, or a sore throat lasting more than a couple of days.
Call 911 or go to the nearest emergency room for trouble breathing, difficulty swallowing to the point of drooling or being unable to swallow saliva, a stiff neck that will not bend, severe or one-sided throat swelling, a muffled voice, or signs of a serious allergic reaction. These are red flags that need emergency care, not a walk-in visit.
It is less likely, but not impossible. Fever and swollen neck glands raise the odds of strep, while their absence lowers them. Because symptoms overlap, a swab test is the only way to be sure.
No. Antibiotics do not help viral sore throats, which are the majority. Taking them unnecessarily can cause side effects and fuel antibiotic resistance. Testing first ensures antibiotics are used only when they will actually help.
Not necessarily. Viruses can cause red, swollen tonsils with white patches too. Appearance alone is unreliable, which is why we test rather than diagnose by sight.
It depends on your insurance and the services you need. We do not list a single price here. Please see our cost and insurance page or call (630) 324-6825 for details specific to your coverage.
No appointment is needed — walk in to either of our Westmont locations for an exam and, if warranted, a rapid strep test with results in minutes. We are open Monday through Friday, 9 AM to 6 PM, and Saturday and Sunday, 9 AM to 5 PM. Check in online to reduce your wait, or call us at (630) 324-6825.
For trusted background from national sources, see Cleveland Clinic on how to tell strep throat from a sore throat and the CDC’s Sore Throat Basics.
This page is for general educational purposes and is not a substitute for professional medical advice. If you are experiencing a medical emergency, call 911.
Monday – Friday: 9:00 AM – 6:00 PM
Saturday – Sunday: 9:00 AM – 5:00 PM
