How Long Does a Sinus Infection Last?
Quick Answer
7–10 days for a viral sinus infection, or 10–14 days for a bacterial sinus infection. Chronic sinusitis can persist for 12 weeks or longer without treatment.
Typical Duration
Quick Answer
Most sinus infections (sinusitis) resolve within 7–10 days if caused by a virus. Bacterial sinus infections typically last 10–14 days and may require antibiotics. Chronic sinusitis can linger for 12 weeks or more and often needs specialized treatment.
Acute vs. Chronic Sinusitis
Sinus infections fall into two broad categories based on how long symptoms persist:
| Type | Duration | Common Cause |
|---|---|---|
| Acute viral | 7–10 days | Cold or flu virus |
| Acute bacterial | 10–14 days | Secondary bacterial infection |
| Subacute | 4–12 weeks | Incomplete treatment or allergies |
| Chronic | 12+ weeks | Structural issues, allergies, or fungi |
Acute viral sinusitis is by far the most common form. It usually develops after a cold and clears on its own without antibiotics. Bacterial sinusitis occurs in roughly 2% of cases and is suspected when symptoms worsen after 5–7 days or persist beyond 10 days without improvement.
How Antibiotics Affect the Timeline
Antibiotics are only effective for bacterial sinus infections and do not help viral cases. When prescribed appropriately, antibiotics like amoxicillin-clavulanate typically produce noticeable improvement within 48–72 hours. A standard course lasts 5–10 days depending on severity.
Overusing antibiotics for viral sinusitis contributes to antibiotic resistance, so most doctors recommend waiting at least 10 days before considering a prescription unless symptoms are severe.
Symptom Timeline
Here is what to expect during a typical acute sinus infection:
- Days 1–3: Nasal congestion, facial pressure, and thick nasal discharge begin
- Days 4–7: Symptoms often peak with headache, post-nasal drip, and reduced sense of smell
- Days 7–10: Gradual improvement for viral infections; bacterial cases may worsen
- Days 10–14: Bacterial infections begin to improve with antibiotic treatment
When to See a Doctor
Seek medical attention if you experience any of the following:
- Symptoms lasting longer than 10 days without improvement
- Fever above 102 degrees Fahrenheit (39 degrees Celsius)
- Symptoms that improve and then suddenly worsen
- Severe facial pain or swelling around the eyes
- Multiple sinus infections within a year
Practical Tips for Faster Recovery
- Stay hydrated to thin mucus and promote drainage
- Use a saline nasal rinse (neti pot or squeeze bottle) twice daily
- Apply warm compresses to your face to relieve pressure
- Sleep with your head elevated to reduce congestion at night
- Use a humidifier to keep air moist, especially in winter
- Take OTC decongestants (pseudoephedrine or oxymetazoline) for short-term relief, but limit nasal sprays to 3 days to avoid rebound congestion
Prevention
Reduce your risk of sinus infections by washing hands frequently, managing allergies proactively, avoiding cigarette smoke, and staying current on flu and COVID vaccinations. If you experience recurrent sinusitis, an ENT specialist can evaluate whether structural issues like a deviated septum or nasal polyps are contributing factors.