Most sinus infections are caused by viruses and will clear up on their own. About 70% resolve within two weeks without antibiotics. That said, there’s plenty you can do to speed your recovery, reduce the misery, and recognize when the infection needs medical treatment.
Why Sinus Infections Linger
A sinus infection almost always starts with a common cold. The virus inflames the lining of your nasal passages, which causes two problems at once: your sinus openings swell shut, and the tiny hair-like structures (cilia) that normally sweep mucus out of your sinuses get damaged and slow down. Mucus builds up in the sealed cavities, creating pressure, pain, and a breeding ground for bacteria.
This is why sinus infections feel so much worse than a regular cold. The trapped mucus has nowhere to go, and the inflammation feeds on itself. The virus also disrupts the normal balance of bacteria in your airways, increasing the proportion of species that can cause secondary infections. So even though the virus itself may burn out in a week, the swelling and mucus stagnation it leaves behind can persist much longer.
Nasal Irrigation: The Single Most Effective Home Treatment
Flushing your sinuses with salt water does mechanically what your damaged cilia can’t: it washes out trapped mucus, inflammatory debris, and pathogens. Stanford Medicine recommends irrigating each nostril twice a day, though more frequent use is also fine during an active infection.
To make the saline solution, combine one teaspoon of non-iodized salt (kosher or pickling salt) and one teaspoon of baking soda with about one cup (240 mL) of water. The water must be either boiled and cooled or distilled. Never use tap water directly, as it can contain organisms that are harmless in your stomach but dangerous in your sinuses. Use a squeeze bottle or neti pot, and clean the device after each use.
Most people notice relief after the very first rinse. The baking soda buffers the solution so it doesn’t sting. If you do nothing else on this list, do this one.
Decongestant Sprays: Helpful but Time-Limited
Over-the-counter nasal decongestant sprays work by shrinking the blood vessels inside your nose, which reduces swelling and lets air (and mucus) move again. The relief is fast and dramatic. The catch is that you can only use them for three days. Beyond that, the spray can actually cause rebound congestion, a condition called rhinitis medicamentosa.
Here’s the mechanism: when the spray repeatedly cuts off blood flow to your nasal tissue, the tissue becomes starved of nutrients and responds with inflammation. That inflammation produces the exact same congestion you were trying to fix, which tempts you to use more spray, creating a vicious cycle. Stick to three days maximum. If you need longer relief, switch to a steroid nasal spray (see below) or oral decongestants.
Steroid Nasal Sprays
Nasal corticosteroid sprays (available over the counter in several brands) reduce inflammation inside the sinuses without the rebound risk of decongestant sprays. They start working within 3 to 12 hours and become more effective with consistent daily use. One to two sprays per nostril once or twice a day is the standard approach.
These sprays are especially useful if your sinus infections tend to recur or if you have underlying allergies driving the inflammation. Unlike decongestant sprays, they’re safe for extended use.
Other Supportive Measures That Help
Keep your indoor humidity between 30% and 50%. Below that range, your mucous membranes dry out and crack, making them more vulnerable to infection and less able to clear mucus. Above 50%, you risk encouraging mold and dust mites, which can worsen sinus problems. A simple hygrometer (under $15 at most hardware stores) lets you monitor this.
Staying well hydrated thins your mucus and makes it easier to drain. Warm liquids, including broth, tea, and plain hot water, can provide temporary relief by loosening congestion. Sleeping with your head slightly elevated helps prevent mucus from pooling in the sinuses overnight.
Bromelain, an enzyme found in pineapple, has mucolytic properties: it breaks down proteins in thick mucus, making it more fluid and easier to clear. It also has anti-inflammatory effects on respiratory tissue. Research suggests that doses of 200 to 500 mg per administration are effective, and some evidence points to doses up to 750 to 1,000 mg daily for optimal results. Look for products rated at least 2,000 GDU (a measure of enzyme activity). NAC (N-acetylcysteine), another supplement available over the counter, works through a different mechanism to thin mucus by breaking chemical bonds that give it a gel-like consistency. Some research has found the combination of bromelain and NAC particularly effective at breaking down thick respiratory mucus.
How to Tell if You Need Antibiotics
The critical question with any sinus infection is whether it’s viral or bacterial, because antibiotics only work against bacteria. The distinction comes down to timing and pattern, not the color of your mucus (a common misconception).
Your infection is likely still viral if your symptoms have been present for fewer than 10 days and are gradually improving. Bacterial sinusitis is suspected in three specific scenarios, according to guidelines from the Infectious Diseases Society of America:
- Persistent symptoms: No improvement at all after 10 or more days.
- Severe onset: A fever of 102°F or higher along with facial pain and nasal discharge lasting 3 to 4 consecutive days.
- Double worsening: Symptoms start to improve after 4 to 7 days, then suddenly get worse again.
If any of these patterns match your experience, it’s time to see a provider. The recommended first-line antibiotic is amoxicillin-clavulanate, not plain amoxicillin, which many clinicians still prescribe out of habit. If you’re prescribed plain amoxicillin, it’s worth asking about the updated recommendation.
Warning Signs That Need Urgent Attention
Sinus infections rarely become dangerous, but when they do, the complications can be serious. The sinuses sit directly behind your eyes and just below your brain, so infection can occasionally spread to those areas. Seek immediate care if you develop any of these symptoms during a sinus infection:
- Vision changes: Blurred vision, double vision, or any loss of sight in one eye. Sinus infections can compress the optic nerve, and delayed treatment can cause permanent, irreversible vision loss.
- Swelling around the eye: Redness, swelling, or the inability to move your eye normally.
- Severe headache with high fever: Particularly if accompanied by neck stiffness or confusion, which can signal intracranial spread.
These complications are uncommon but move quickly when they occur. Hours can matter.