Strep Throat vs. Sore Throat: How to Tell the Difference

What Causes a Sore Throat?

The vast majority of sore throats are caused by viruses — rhinovirus (the common cold), influenza, adenovirus, and even COVID-19 can all cause significant throat pain. Viral sore throats are not helped by antibiotics and resolve on their own in 5–10 days. Streptococcal pharyngitis (strep throat) is caused by Group A Streptococcus bacteria — and that one we do want to treat with antibiotics, both to shorten illness and to prevent rare complications like rheumatic fever.

Classic Strep Throat Symptoms

Strep throat tends to have a very specific presentation that sets it apart from a typical viral sore throat. Signs that raise clinical suspicion for strep include:

• Sudden onset of severe sore throat without gradual buildup
• Fever above 101°F
• Significant swollen, tender lymph nodes in the front of the neck
• White patches or pus on the tonsils
• No cough (cough strongly suggests viral, not strep)
• No runny nose or other cold symptoms

Physicians use a clinical tool called the Centor criteria (modified by McIsaac) to estimate the probability of strep based on these features. The more criteria present, the higher the likelihood of a positive strep test.

Signs It's Probably Viral (Not Strep)

Certain features make a viral cause much more likely:

• Sore throat accompanied by runny nose, congestion, or cough
• Gradual onset over 1–2 days
• Low-grade or no fever
• Scratchy throat without significant swelling
• Mouth sores or hoarseness (suggests viral)

If your sore throat fits this pattern, antibiotics won't help — and I won't prescribe them. Rest, fluids, honey, warm tea, and over-the-counter pain relief are your best tools.

Can Strep Be Diagnosed via Telehealth?

Clinically, yes — a physician can assess strep probability based on your symptoms and a throat view on video. For definitive testing, a rapid strep test at a local pharmacy (many offer this over the counter now) or urgent care confirms the diagnosis. If clinical suspicion is high enough, some physicians will treat presumptively while you arrange testing — a shared decision made based on your specific situation.

Strep Treatment

Penicillin and amoxicillin remain first-line antibiotics for strep throat and are highly effective. Most patients feel significantly better within 24–48 hours of starting antibiotics. You are contagious until you've been on antibiotics for at least 24 hours and are fever-free.