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Do I Need Antibiotics for a Sinus Infection? An ENT in Gangnam, Seoul Answers

Answered by Dr. Kim Yoo Suk, MD · Board-certified otolaryngologist · Former professor, Yonsei & Ajou University · Consultations in English

The direct answer: usually not, but sometimes yes

Acute sinusitis is inflammation of the sinus lining lasting less than four weeks. It most often follows a viral cold. Antibiotics do nothing against viruses, and using them unnecessarily causes side effects such as diarrhea and rash and contributes to antibiotic resistance.

That said, a minority of sinus infections become bacterial, and in those cases antibiotics can shorten the illness and reduce the risk of complications.

When doctors consider antibiotics

International ENT guidelines describe three typical patterns that suggest acute bacterial sinusitis:

• Persistent: nasal symptoms lasting more than 10 days without any improvement.
• Severe onset: high fever with thick nasal discharge or facial pain for three to four days in a row from the start.
• Double worsening: a cold that begins to improve, then gets worse again with new fever, headache, or more discharge.

Even when these criteria are met, some adults with mild symptoms can be observed for a few days with close follow-up, as many still recover without antibiotics.

What helps regardless of the cause

• Saline nasal irrigation to clear mucus and reduce swelling
• Steroid nasal sprays to calm inflammation
• Pain relievers such as acetaminophen for facial pain or fever
• Rest, fluids, and humidified air
• Short-term decongestants only, to avoid rebound congestion

Why overusing antibiotics is a problem

Each unnecessary course disturbs the normal bacteria in the gut and nose and encourages resistant strains. That can make a future, genuinely bacterial infection harder to treat. It is also common for people to feel better on day three of a viral illness and credit the antibiotic, when recovery would have happened anyway. A clear diagnosis protects you from both side effects and false reassurance.

Chronic sinusitis is a different situation

For chronic sinusitis, lasting 12 weeks or more, repeated short antibiotic courses often provide only temporary relief because the problem is ongoing inflammation, polyps, or blocked drainage. Some cases also have a non-bacterial cause, such as fungal sinusitis, which antibiotics do not treat.

What we do at Gangnam Yonsei ENT

Rather than prescribing based on symptoms alone, Dr. Kim Yoo Suk, a board-certified ENT who co-authored research on chronic rhinosinusitis diagnosis, examines the nose with a nasal endoscopy. Seeing pus draining from the sinus openings supports a bacterial infection, while a swollen but clear lining points away from it. When infection is confirmed, an appropriate antibiotic is chosen and the course is explained clearly.

If you have had several courses already, or symptoms keep returning, a sinus CT scan helps identify an underlying cause, such as a dental source, polyps, or a narrow drainage pathway. When medication fails, endoscopic sinus surgery may be discussed.

When to seek urgent care

Swelling or redness around the eye, double vision, severe headache, a stiff neck, or confusion during a sinus infection are emergencies. Seek care immediately.

English consultations are available near Gangnam-gu Office Station. Read our English-speaking ENT guide and the related answer on when sinus surgery is needed.

Related questions

How long should a sinus antibiotic course be?

It depends on the antibiotic and the situation, but courses for acute bacterial sinusitis commonly range from about five to ten days. Take it exactly as prescribed and return if you are not improving within a few days of starting.

Can I ask for antibiotics just in case before a trip?

Antibiotics are prescribed when there is a reasonable sign of bacterial infection, not as a precaution. If you are traveling soon with sinus symptoms, an examination can clarify whether you need them and what to do if symptoms change.

Why did antibiotics not work for my sinusitis?

Possible reasons include a viral cause, chronic inflammation rather than infection, nasal polyps, a dental source, fungal disease, or resistant bacteria. An endoscopy and sometimes a CT scan help find the real reason before trying more antibiotics.

This answer is general medical information written and reviewed by an ENT specialist. It is not a diagnosis. Please see a doctor for an examination. In an emergency in Korea, call 119.