Most sinusitis clears up within 7 to 10 days. That’s the typical timeline for a viral sinus infection, which accounts for the vast majority of cases. Bacterial sinusitis lasts longer, and a small percentage of people develop chronic sinusitis that persists for 12 weeks or more. The exact duration depends on the type you’re dealing with and whether treatment is needed.
Viral Sinusitis: 7 to 10 Days
The most common form of sinusitis is caused by a virus, usually the same one behind a cold. Symptoms like congestion, facial pressure, and thick nasal discharge typically peak around days 3 to 5, then gradually improve toward the end of the 7 to 10 day window. You won’t need antibiotics for viral sinusitis because antibiotics don’t work against viruses. Over-the-counter remedies, saline rinses, and rest are usually enough to get through it.
One frustrating reality: even after the infection itself clears, a lingering cough or mild congestion can stick around for several more weeks. This post-viral cough typically lasts 3 to 8 weeks and doesn’t mean you’re still sick. It’s just your airways recovering from the inflammation.
When It’s Bacterial: 10 Days or More
Bacterial sinusitis develops in a smaller subset of cases, often as a secondary infection after a viral illness. Doctors look for specific patterns to distinguish it from a lingering cold. The key signals are symptoms that last at least 10 days with no improvement at all, or a “double worsening” pattern where you start to feel better after 5 or 6 days, then suddenly get worse again with new fever, increased nasal discharge, or worsening headache.
A third presentation is more dramatic: a high fever (102.2°F or higher) with thick, discolored nasal discharge lasting at least 3 to 4 consecutive days right at the start of the illness. This severe presentation is less common but warrants prompt attention.
If you do need antibiotics for bacterial sinusitis, most people notice improvement within 3 to 5 days of starting treatment. Older adults or those with other health conditions may take slightly longer, but some degree of improvement should be noticeable within 5 days. The full course of treatment typically runs 10 days or longer, and it’s important to finish it even once you feel better.
Subacute Sinusitis: 4 to 12 Weeks
Some infections fall into a middle zone. Subacute sinusitis is the term for symptoms that persist beyond the typical acute phase but haven’t yet crossed the chronic threshold. This stage lasts from about 4 to 12 weeks. It often represents an acute infection that didn’t fully resolve, either because it went untreated, treatment didn’t work well enough, or underlying factors like allergies or nasal polyps are keeping inflammation going.
If your symptoms are still present after 4 weeks, that’s a reasonable point to check in with a healthcare provider if you haven’t already. You may need a different treatment approach or an evaluation for what’s keeping the inflammation active.
Chronic Sinusitis: 12 Weeks and Beyond
Sinusitis that lasts 12 weeks or longer is classified as chronic. Unlike acute sinusitis, chronic sinusitis isn’t usually driven by a single infection. It’s more of an ongoing inflammatory condition, often related to allergies, nasal polyps, a deviated septum, or immune system factors. The symptoms tend to be less intense than acute sinusitis but more persistent: constant low-grade congestion, reduced sense of smell, facial pressure, and post-nasal drip that just won’t quit.
Treatment for chronic sinusitis focuses on controlling inflammation rather than fighting infection. Nasal steroid sprays, saline irrigation, and allergy management are the mainstays. When these approaches aren’t enough, functional endoscopic sinus surgery (FESS) is an option. Recovery from FESS takes a few months to feel fully complete, though most people return to their normal routine within about two weeks. Mild bleeding, stuffiness, and mucus discharge can continue for several weeks as the sinuses heal.
Sinusitis in Children
The timelines are similar for children, but the symptoms to watch for look a little different. In kids ages 1 to 18, bacterial sinusitis is suspected when a daytime cough or nasal discharge persists beyond 10 days without improvement, or when symptoms worsen after initially getting better. The severe presentation, a fever of at least 102.2°F with thick discolored discharge for 3 or more consecutive days, applies to children the same way it does for adults.
Treatment courses for children with bacterial sinusitis range from 10 to 28 days depending on the approach. One common strategy is to treat for 7 days beyond when symptoms resolve, which means the course length varies from child to child but runs at least 10 days total.
Signs Your Sinusitis Needs Attention
Most sinusitis resolves on its own, but certain patterns suggest something more is going on. Symptoms lasting more than a week without any improvement, symptoms that get worse after initially getting better, and a persistent fever are all reasons to seek care. These patterns can signal a bacterial infection that needs treatment or, in rare cases, a complication that needs more urgent evaluation.
Sudden severe symptoms deserve faster attention. Swelling or redness around the eyes, intense headache, high fever, confusion, or stiff neck are uncommon but serious warning signs. These could indicate the infection has spread beyond the sinuses, which requires immediate medical care.