Most sinus infections last 7 to 10 days. The vast majority are caused by viruses and clear up on their own without antibiotics. However, infections that drag on beyond 10 days without improving, or that seem to get better and then worsen again, may have become bacterial and could take longer to fully resolve.
Viral Sinus Infections: The Most Common Type
Around 9 out of 10 sinus infections start with a virus, usually the same ones responsible for the common cold. For the first three to four days, a viral sinus infection looks and feels identical to the early stages of a bacterial one. There’s no reliable way to tell them apart during that window. You’ll typically experience congestion, facial pressure, thick nasal discharge, and possibly a low-grade fever.
Symptoms generally peak around days 3 to 5, then gradually improve. Most people feel noticeably better within 7 to 10 days, though mild congestion can linger a bit longer. About two-thirds of people with acute sinusitis will improve within 14 to 21 days even without any treatment beyond basic symptom relief.
When a Sinus Infection Becomes Bacterial
A bacterial sinus infection develops when bacteria take hold in sinuses already inflamed by a virus. There are three patterns that suggest this has happened:
- Symptoms lasting 10 or more days without any sign of improvement.
- Severe onset: a fever of 102°F or higher with thick, discolored nasal discharge and facial pain lasting 3 to 4 days at the start of the illness.
- “Double sickening”: symptoms that improve after 4 to 7 days, then come back worse. This worsening typically happens between days 5 and 10.
Bacterial sinus infections generally require antibiotics. For adults, a typical course runs 5 to 7 days. Children with bacterial sinusitis usually need a longer course of 10 to 14 days. With appropriate treatment, most people start feeling better within 2 to 3 days, though it’s important to finish the full course prescribed.
Chronic Sinusitis Is a Different Problem
If sinus symptoms persist for 12 weeks or longer, the condition is classified as chronic sinusitis. This isn’t simply a regular sinus infection that won’t go away. Chronic sinusitis involves ongoing inflammation of the sinus lining and can be driven by allergies, nasal polyps, structural issues in the nasal passages, or a combination of factors. It requires a different treatment approach than an acute infection, and people dealing with months of congestion and facial pressure should have their sinuses evaluated.
What Helps You Recover Faster
Since most sinus infections are viral, antibiotics won’t speed up recovery in the majority of cases. What does help is managing symptoms so you’re more comfortable while your immune system does the work.
Saline nasal rinses (using a neti pot or squeeze bottle) help flush out mucus and reduce congestion. Over-the-counter decongestants can provide short-term relief, though nasal spray versions shouldn’t be used for more than three days in a row to avoid rebound congestion. Pain relievers can address facial pressure and headaches.
Prescription steroid nasal sprays have a modest benefit. Research across multiple clinical trials found that about 66% of people with acute sinusitis improve within two to three weeks with a placebo alone, and steroid sprays add roughly 7% to that number. The benefit tends to show up closer to the three-week mark rather than in the first two weeks. They’re more useful for people whose symptoms are dragging on than for shortening a straightforward infection by a meaningful amount.
Sinus Infections in Children
Children get sinus infections frequently, partly because their immune systems are still developing and partly because they catch more colds. The same 10-day rule applies: if a child’s symptoms haven’t improved after 10 days, a bacterial infection is more likely. Kids tend to present with persistent nasal discharge (which may be clear or thick) and a cough, rather than the facial pain and pressure adults describe. When antibiotics are needed, children are typically treated for 10 to 14 days, roughly twice the adult course length.
Warning Signs That Need Prompt Attention
Sinus infections very rarely cause serious complications, but certain symptoms signal that the infection may be spreading beyond the sinuses. Swelling or redness around the eyes, double vision, difficulty moving the eyes, severe headache paired with a high fever, eye pain, or any changes in mental clarity all warrant immediate medical evaluation. These can indicate the infection has extended toward the eye socket or the brain, which requires urgent treatment. This is uncommon, but recognizing these signs matters.