How can I tell if my sinus infection is bacterial or viral?

[Aria.A]

I’m trying to understand the difference between a bacterial sinus infection and a viral one. My doctor mentioned the color or duration of symptoms isn’t a reliable way to tell, and that unnecessary antibiotics for a viral case can contribute to antimicrobial resistance. How did you finally know which one you had?

[Aaron86]

Took me a week of congestion and fever, and color didn’t tell me much. The doctor did a normal exam and said to watch it for 7–10 days. It got better by day 9 without antibiotics, so I lean viral in hindsight.

[MarkTH]

Another time the clinic did a quick nasal swab to rule out flu or COVID; it came back negative. With that and the symptoms lingering, we still chose not to push antibiotics and it cleared up on its own after about a week.

[Ryan35]

I tried saline rinses, humidifier, fluids, and rest; kept track of fever and how hard it was to breathe through one side; none of that suddenly snapped into bacterial timing, so I think it was viral.

[JustinM]

Sometimes I wonder if the problem is really timing or if allergies or chronic irritation are the real culprit; do you think your symptoms fit something like that more than a fresh infection?