Most sinus infections clear up within 10 days without any treatment. The vast majority, between 90% and 98%, are caused by viruses, which means antibiotics won’t help and the infection simply needs to run its course. How long yours lasts depends on whether it’s viral, bacterial, or has tipped into something more persistent.
Viral Sinus Infections: The 10-Day Window
A typical viral sinus infection follows a cold. You get congested, pressure builds around your forehead or cheeks, and thick mucus makes breathing through your nose difficult. This usually peaks around days 3 to 5 and then gradually improves. Most people feel noticeably better within 7 to 10 days.
During that window, your body is doing the work on its own. Over-the-counter pain relievers, saline nasal rinses, and steam can ease the discomfort, but nothing speeds up the underlying viral timeline. If you’re on day 6 and still miserable, that’s normal. The tail end of a viral sinus infection can drag, with lingering congestion or a mild cough that sticks around a few days after the worst has passed.
When It Might Be Bacterial
About 2% to 10% of sinus infections involve bacteria rather than a virus. The tricky part is that bacterial sinusitis doesn’t look dramatically different at first. The CDC uses three patterns to distinguish it from a viral case:
- Persistent symptoms. Nasal discharge or daytime cough lasting more than 10 days with no improvement at all.
- Severe symptoms. A fever of 102°F (39°C) or higher combined with thick, discolored nasal discharge or significant facial pain, lasting more than 3 to 4 days.
- Double worsening. You start to feel better after 5 to 6 days of a cold, then suddenly get worse again with new or returning fever, worsening congestion, or increased cough.
If any of those patterns match what you’re experiencing, a bacterial infection is more likely, and antibiotics may actually help. For adults, a typical antibiotic course runs 5 to 7 days. Most people notice improvement within the first 2 to 3 days of starting treatment, though you should finish the full course. With appropriate treatment, bacterial sinusitis generally resolves within 2 to 3 weeks total from when symptoms first appeared.
Sinus Infections in Children
Kids follow roughly the same timeline as adults for viral sinus infections, but when antibiotics are needed, they’re typically prescribed for a longer stretch of 10 to 14 days. Children are also more prone to complications. If your child develops a high fever along with swelling, redness, or bulging around one eye, that warrants an emergency room visit. This can signal orbital cellulitis, an infection that spreads from the sinuses into the tissue around the eye and can threaten vision if untreated.
Chronic Sinusitis: Beyond 12 Weeks
When sinus symptoms persist for 12 weeks or longer, the diagnosis shifts to chronic sinusitis. This is a different condition from a single acute infection. Chronic sinusitis involves ongoing inflammation in the sinus passages that doesn’t fully resolve, often driven by factors like nasal polyps, allergies, or structural issues in the nasal passages rather than a single virus or bacterium.
Chronic sinusitis is common, and treatment looks different from a standard sinus infection. It typically involves longer courses of nasal steroid sprays, regular saline irrigation, and sometimes surgery to improve sinus drainage. If you’ve been dealing with facial pressure, thick nasal discharge, and reduced sense of smell for months rather than days, this is the category your symptoms likely fall into.
Signs Your Infection Is Improving
Recovery from a sinus infection isn’t like flipping a switch. You won’t wake up one morning completely clear. Instead, look for a gradual pattern: the facial pressure becomes less intense, your nasal discharge thins out and becomes clearer, and your energy starts returning. Many people notice their worst symptoms (pain, thick discharge, fatigue) ease first, while mild congestion or a light cough lingers for several more days. That trailing congestion doesn’t mean you’re still infected. It’s your sinuses finishing the cleanup.
The color of your mucus, by the way, isn’t a reliable indicator of whether you have a viral or bacterial infection. Both can produce green or yellow discharge. What matters more is the pattern over time: steady improvement over 7 to 10 days points to a virus resolving normally, while worsening after initial improvement or no change at all after 10 days suggests something else is going on.