Most sinus infections clear up within 7 to 10 days without any medical treatment. Some people have symptoms that linger up to four weeks, but the majority of cases are viral and resolve on their own. How long yours lasts depends on whether it’s viral, bacterial, or has tipped into chronic territory.
Viral Sinus Infections: 7 to 10 Days
The vast majority of sinus infections start as viral infections, essentially a cold that has spread into the sinus cavities. Congestion, facial pressure, thick nasal discharge, and a reduced sense of smell typically peak around days 3 to 5, then gradually improve. By day 7 to 10, most people feel noticeably better, even if mild congestion hangs around a bit longer.
There’s no antibiotic or medication that shortens a viral sinus infection. Your body clears the virus on its own. What you can do is manage symptoms in the meantime. Large-volume saline rinses (using a squeeze bottle or neti pot, not just a spray) consistently reduce the severity and frequency of sinus symptoms compared to simple nasal sprays. In one trial, 40% of people using saline irrigation still reported frequent symptoms at 8 weeks, compared to 61% of those using spray alone. The rinses don’t kill the virus, but they flush out mucus and inflammatory debris, which helps you feel better faster.
When It Might Be Bacterial
About 2% to 10% of sinus infections become bacterial. The key question isn’t really “is this bacterial?” but rather “has this lasted long enough or gotten bad enough to suggest bacteria are involved?” Guidelines from the Infectious Diseases Society of America point to three patterns that suggest a bacterial infection:
- Persistent symptoms: Congestion, discharge, or facial pain lasting 10 days or more with no improvement at all.
- Severe onset: A fever of 102°F or higher with facial pain and thick, discolored nasal discharge lasting 3 to 4 consecutive days.
- Double worsening: Symptoms that seem to improve after 4 to 7 days, then suddenly get worse again.
If your infection follows one of these patterns, antibiotics are appropriate. The recommended course is 5 to 7 days for straightforward cases. Most people start feeling better within the first few days of treatment, though you should finish the full course.
Sinus Infections in Children
Kids get sinus infections more frequently than adults, partly because their sinuses are still developing and partly because they catch more colds. The timeline is similar, but the signs of a bacterial infection look slightly different. The most common tip-off is a cold that simply doesn’t improve after 10 days. A child with an uncomplicated cold will almost always be getting better by day 10, even if symptoms haven’t fully disappeared. A child whose cough, congestion, and nasal discharge are just as bad on day 10 as they were on day 5 likely has a bacterial sinus infection.
Persistent nasal discharge lasting more than 14 days, or sinus congestion and fullness beyond 14 days, are also signs worth having evaluated.
Subacute and Chronic Sinusitis
Not all sinus infections follow the neat 7-to-10-day script. Subacute sinusitis describes symptoms lasting 30 to 90 days. This sometimes happens when a bacterial infection isn’t fully treated or when underlying inflammation keeps the sinuses from draining properly.
Chronic sinusitis is defined by at least 12 weeks of continuous symptoms. It requires two or more of the following: thick or discolored drainage, nasal congestion, facial pain or pressure, and a decreased sense of smell. Chronic sinusitis isn’t just a long infection. It’s a persistent inflammatory condition that often involves structural issues, allergies, or immune factors. Treatment shifts from antibiotics toward longer-term strategies like daily saline irrigation, nasal corticosteroid sprays, and sometimes surgery to improve sinus drainage.
Lingering Symptoms After the Infection Clears
Even after the infection itself is gone, you may notice a cough that sticks around. This post-viral cough is one of the most common reasons people think their sinus infection hasn’t cleared when it actually has. The infection irritates your airways, and that irritation takes time to calm down. A persistent post-infection cough typically lasts 3 to 8 weeks. If it stretches past 8 weeks, it’s considered chronic and worth investigating further.
Mild congestion and a slightly reduced sense of smell can also lag behind by a week or two. This doesn’t necessarily mean you’re still infected. It means the swollen tissue inside your sinuses hasn’t fully returned to normal yet. Continuing saline rinses during this period can help speed the process along.
Signs of a Serious Complication
Sinus infections very rarely become dangerous, but the sinuses sit close to the eyes and brain, so complications can be serious when they occur. Seek immediate care if you develop swelling or redness around an eye, severe headache with a high fever, stiff neck, confusion, or vision changes. These can signal that the infection has spread beyond the sinuses. Trouble breathing, especially in children, also warrants urgent evaluation: look for rapid breathing, ribs pulling inward with each breath, or a bluish tint to the lips or face.