Most sinus infections are viral and clear up on their own within 7 to 10 days. When symptoms persist beyond that window, worsen after initial improvement, or arrive with a high fever, doctors shift toward antibiotics and more targeted treatments. The approach depends almost entirely on whether the infection is viral or bacterial, how long it’s lasted, and whether it keeps coming back.
How Doctors Tell if It’s Bacterial
The first thing your doctor will determine is whether your sinus infection is caused by a virus or bacteria, because this changes the entire treatment plan. Viral sinus infections, which account for the vast majority of cases, don’t respond to antibiotics at all. Three patterns point toward a bacterial cause: symptoms lasting 10 days or more without improvement, a fever of 102°F or higher alongside nasal discharge and facial pain for three to four consecutive days, or symptoms that seem to get better after four to seven days and then suddenly get worse again.
If your symptoms don’t match any of those patterns, your doctor will likely diagnose a viral infection and focus entirely on helping you manage symptoms while your immune system does the work.
Watchful Waiting Before Antibiotics
Even when a bacterial infection is suspected, antibiotics aren’t always prescribed right away. Current guidelines from the American Academy of Family Physicians recommend that adults with uncomplicated bacterial sinus infections can be offered a period of watchful waiting instead of immediate antibiotics. During this period, you manage symptoms at home while monitoring whether things improve on their own. If symptoms haven’t improved after seven days of observation, or if they worsen at any point, your doctor will then prescribe antibiotics.
This approach exists because mild bacterial sinus infections sometimes resolve without medication, and unnecessary antibiotic use contributes to drug resistance. Your doctor will weigh the severity of your symptoms when deciding whether to prescribe right away or wait.
Antibiotics for Bacterial Infections
When antibiotics are warranted, amoxicillin is the standard first choice. For infections that are more severe or haven’t responded to a first round, doctors often use amoxicillin combined with clavulanate, which helps the antibiotic work against a broader range of bacteria. The typical course runs 5 to 10 days, and treatment generally continues for at least 48 to 72 hours after symptoms resolve to fully clear the infection.
If you have a penicillin allergy, your doctor will choose an alternative antibiotic. The key thing to know is that you should finish the full course even if you start feeling better within a few days. Stopping early increases the chance the infection returns.
Steroid Nasal Sprays
Corticosteroid nasal sprays are one of the most effective tools for sinus infections, both acute and chronic. These sprays reduce inflammation inside the nasal passages, which helps your sinuses drain and relieves pressure and congestion. They work differently from decongestant sprays (more on those below) and are safe for longer-term use.
For chronic sinusitis, the evidence is particularly strong. A large meta-analysis covering 40 studies and over 3,600 people found that corticosteroid sprays moderately reduced symptom scores compared to placebo, especially in patients with nasal polyps. Researchers recommend combining a steroid spray with saline irrigation as the first-line treatment for chronic sinus problems. Your doctor may prescribe a steroid spray alongside antibiotics for an acute infection, or as a standalone treatment for ongoing sinus issues.
Saline Irrigation
Rinsing your sinuses with salt water is one of the simplest and most effective home treatments, and doctors routinely recommend it. Saline irrigation physically flushes out mucus, allergens, and inflammatory debris from the nasal passages. You can use a neti pot, squeeze bottle, or bulb syringe.
The water you use matters. Tap water contains trace amounts of minerals, germs, and other substances you don’t want introduced directly into your sinuses. Use distilled water (labeled “distilled” on the bottle), sterile water, or water you’ve boiled and allowed to cool. This isn’t optional. Rare but serious infections have been linked to nasal irrigation with untreated tap water.
Over-the-Counter Decongestants
Oral decongestants and decongestant nasal sprays can provide quick relief from the stuffed, pressurized feeling of a sinus infection. Oral options help shrink swollen tissue throughout the nasal passages. Spray decongestants work faster and more directly, but they come with a strict time limit: no more than three days of consecutive use.
After about three days, decongestant sprays can cause a rebound effect called rhinitis medicamentosa, where the nasal lining becomes more swollen than it was before you started using the spray. This creates a cycle where you feel like you need the spray more and more. If you need longer-term congestion relief, a corticosteroid spray is a safer choice.
Pain relievers like ibuprofen or acetaminophen help with facial pain and pressure. Warm compresses placed over the sinuses can also ease discomfort.
When Surgery Becomes an Option
Surgery is reserved for chronic sinusitis that hasn’t responded to medications, or for structural problems like nasal polyps or deviated septums that keep sinuses from draining properly. It’s not something doctors consider for a single acute infection.
The two main options are functional endoscopic sinus surgery (FESS) and balloon sinuplasty. FESS is a more involved procedure generally reserved for patients with extensive sinus disease, particularly large nasal polyps that need to be physically removed to restore drainage. The surgeon uses a thin camera inserted through the nostrils to remove tissue, polyps, or bone blocking the sinus openings.
Balloon sinuplasty is a less invasive alternative for patients whose sinus drainage pathways are blocked but who don’t have extensive polyps or bone growth. A small balloon is threaded into the blocked sinus opening and inflated to widen it. It’s also an option for patients who aren’t good candidates for general anesthesia. Your ENT specialist will use CT scans and your medical history to determine which approach fits your situation.
Acute vs. Chronic: Different Approaches
Acute sinus infections (lasting less than four weeks) are treated with the goal of clearing the current infection and managing symptoms. The combination of watchful waiting or antibiotics, plus decongestants, saline rinses, and possibly a steroid spray, resolves most cases.
Chronic sinusitis (symptoms lasting 12 weeks or longer) requires a different strategy. Since the underlying problem is persistent inflammation rather than a single infection, treatment focuses on long-term control. Daily corticosteroid sprays and regular saline irrigation form the foundation. Your doctor may investigate underlying causes like allergies, nasal polyps, or immune system issues. Antibiotics play a smaller role in chronic cases and are typically used only during bacterial flare-ups. If medications don’t bring the inflammation under control after several months, surgery enters the conversation.