Most sinus infections last 7 to 10 days. The majority are caused by viruses, follow the same course as a bad cold, and clear up on their own without antibiotics. How long yours lasts depends on whether it’s viral, bacterial, or has tipped into a longer-lasting chronic form.
Viral Sinus Infections: 3 to 10 Days
The most common type of sinus infection starts with a virus. Symptoms typically appear 24 to 72 hours after exposure and persist for 3 to 10 days. If you smoke, symptoms can drag on for up to two weeks. You’ll usually feel worst around days 3 to 4, then gradually improve. Congestion, facial pressure, and thick nasal discharge are all normal during this window and don’t automatically mean you need treatment beyond rest, fluids, and over-the-counter symptom relief.
Up to two-thirds of people with acute sinusitis recover completely without any active treatment. That’s a key number to keep in mind if you’re on day 5 and wondering whether you need to call a doctor. If your symptoms are steadily improving, even slowly, your body is likely handling it.
When a Bacterial Infection Is More Likely
A smaller percentage of sinus infections are bacterial, and these tend to last longer and feel more intense. Doctors use three main patterns to distinguish bacterial sinusitis from a lingering virus:
- Persistent symptoms: At least 10 days of symptoms with no improvement at all.
- Double worsening: You start to feel better after a typical cold, then get noticeably worse again around day 5 or 6. This “got better then got worse” pattern is a classic sign that bacteria have taken hold.
- Severe onset: A fever of 102°F or higher along with thick, discolored nasal discharge or significant facial pain lasting at least 3 to 4 days.
If none of these apply, antibiotics are unlikely to help, even if you’re miserable. One study found that patients who took antibiotics reported slightly better symptom scores at day 3, but by day 10, their scores were nearly identical to people who took a placebo (5.2 versus 5.4 on a 30-point scale). At 14 days, recovery rates were 80 percent with antibiotics and 66 percent without, a difference that wasn’t statistically significant. Meanwhile, the antibiotic group had more side effects.
How Long Bacterial Sinusitis Takes to Clear
When antibiotics are warranted, most people start noticing improvement within the first few days of treatment. But “improvement” doesn’t mean “gone.” You may still have lingering congestion and mild pressure for a week or more after starting medication. Full resolution of a bacterial sinus infection typically takes 10 to 14 days from when symptoms first appeared.
If your symptoms haven’t improved at all after 3 to 5 days on antibiotics, that’s worth a follow-up call to your doctor. It could mean the bacteria aren’t responding to the particular antibiotic, or that something else is going on.
Subacute and Chronic Sinusitis
Not all sinus infections wrap up neatly within two weeks. When symptoms persist beyond about 4 weeks but resolve before 12 weeks, this is sometimes called subacute sinusitis. It occupies a middle ground that often responds to more extended treatment or further evaluation.
Chronic sinusitis is defined as symptoms lasting 12 weeks or longer, even with treatment. It requires at least two of the following: thick or discolored drainage (from the front of the nose or dripping down the back of the throat), nasal congestion, facial pain or pressure, or a reduced sense of smell. Chronic sinusitis isn’t just a long cold. It’s a persistent inflammatory condition that often involves structural issues, allergies, or immune factors, and it usually needs a different treatment approach than a standard acute infection.
A Quick Timeline Summary
- Days 1 to 3: Symptoms ramp up. Congestion, facial pressure, and thick mucus are typical.
- Days 3 to 5: Peak misery for most viral infections. Symptoms should plateau or start easing.
- Days 7 to 10: Most viral sinus infections resolve. If you’re still getting worse or haven’t improved at all, bacterial infection becomes more likely.
- Days 10 to 14: The window where bacterial sinusitis, treated or untreated, typically clears.
- 4 to 12 weeks: Subacute territory. Worth investigating further.
- Beyond 12 weeks: Chronic sinusitis by definition.
What Actually Helps While You Wait
Since most sinus infections resolve on their own, the real question for most people is how to feel less awful in the meantime. Saline nasal rinses (using a squeeze bottle or neti pot with distilled or boiled water) help flush out mucus and reduce congestion. Nasal steroid sprays reduce swelling in the sinus passages. Over-the-counter decongestants can provide short-term relief, but using spray decongestants for more than 3 days can cause rebound congestion that makes things worse.
Staying hydrated thins mucus and makes it easier to drain. Steam from a hot shower or a bowl of hot water can loosen congestion temporarily. Sleeping with your head slightly elevated helps sinuses drain overnight and can reduce that awful morning pressure.
The symptoms that should prompt a call to your doctor: no improvement after 10 days, a fever that returns after seeming to improve, severe facial pain or swelling, or any visual changes like double vision or swelling around the eyes. These can signal complications that need prompt attention.