A sinus infection (sinusitis) typically lasts about 7 to 10 days if it is acute. Most acute sinus infections resolve on their own within this period or up to 4 weeks. However, if the infection becomes subacute, it may last 4 to 8 weeks, and chronic sinus infections can last 8 weeks or longer. Viral sinus infections usually improve in less than two weeks, while bacterial infections may require antibiotics and can take longer to resolve. If symptoms persist beyond 10 days, worsen after initial improvement, or are severe, medical advice should be sought as it may indicate a bacterial infection or a chronic condition.

Duration by Type:

• Acute sinusitis: Usually 7 to 10 days, up to 4 weeks.

• Subacute sinusitis: Lasts 4 to 8 weeks.

• Chronic sinusitis: Persists 8 weeks or more, sometimes months or years.

Symptom Improvement:

Symptoms such as runny nose, congestion, facial pressure, postnasal drip, and headache tend to improve as the infection resolves. Antibiotics, if prescribed for bacterial infections, usually take 3 to 28 days to be effective, with symptom improvement appearing after a few days of treatment.

When to Consult a Doctor:

• Symptoms last longer than 10 days without improvement.
• Symptoms worsen after initially improving.
• Severe facial pain, swelling around the eyes, high fever.
• Recurrent sinus infections or chronic symptoms.

In summary, most sinus infections clear within 1 to 2 weeks, but some may last longer depending on the cause and type (viral, bacterial, acute, chronic). Medical evaluation is advised if symptoms are persistent or severe.