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Is It a Sinus Infection or a Cold? An ENT in Gangnam, Seoul Explains

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

The quick way to tell them apart

A common cold is a viral infection of the nose and throat. Sinusitis is inflammation of the sinus lining, and almost every cold causes some short-lived sinus inflammation. The practical question is whether the problem has progressed into a lingering or bacterial sinus infection.

Typical cold pattern

• Starts with a scratchy throat, sneezing, and a runny nose
• Clear discharge that may turn cloudy or yellow for a few days, which is normal
• Peaks around day 2 to 3 and steadily improves
• Mostly gone in 7 to 10 days, although a mild cough can linger

Signs that point toward a sinus infection

• Duration: nasal symptoms beyond 10 days without improvement
• Double worsening: feeling better, then getting worse again
• Facial pain or pressure: over the cheeks, between the eyes, or forehead, often worse when bending forward
• Thick discolored discharge, especially from one side, or postnasal drip with a bad taste
• Reduced sense of smell
• Upper tooth ache on one side, since the maxillary sinus sits just above the upper molars
• Fever with severe facial pain at the start

Color alone is not a reliable sign of bacteria. Yellow or green mucus reflects immune cells and can appear in ordinary colds.

What about allergies?

Allergic rhinitis causes itchy eyes, repeated sneezing, and watery discharge without fever. It often follows a season, a place, or a trigger such as dust mites or pets. Allergies can also set the stage for repeated sinus infections by keeping the nose swollen.

What we do at Gangnam Yonsei ENT

If you are unsure, an examination quickly clarifies things. Dr. Kim Yoo Suk, a board-certified ENT and rhinology subspecialist who previously taught at Yonsei and Ajou universities, uses a nasal endoscopy to look directly at the sinus drainage pathways. Pus flowing from the middle meatus supports acute sinusitis, while a swollen but clean lining suggests a viral cold or allergy.

During flu season, a flu rapid test may be useful if you have sudden fever and body aches. Treatment depends on what is found: supportive care for colds, saline irrigation and steroid sprays for sinus inflammation, and antibiotics only when a bacterial infection is likely. For patients who feel very run down, the clinic also offers cold and flu IV therapy as a supportive option, never as a substitute for diagnosis.

When to see a doctor promptly

Go to a doctor urgently for swelling around the eyes, vision changes, severe headache, neck stiffness, confusion, or a high fever that does not settle. These are uncommon but serious complications.

Walk-ins and phone calls are welcome, and consultations are in English. Visit our English-speaking ENT guide, or read how long sinusitis lasts.

Related questions

Does green mucus mean I need antibiotics?

No. Green or yellow mucus is common during ordinary colds because it contains immune cells. Doctors look at duration, severity, and the pattern of symptoms, such as lasting over 10 days or worsening again, rather than mucus color alone.

Can a cold turn into a sinus infection?

Yes. Swelling from a cold can block the small sinus openings, trapping mucus where bacteria may grow. Only a minority of colds progress this way, but it is the most common route to acute bacterial sinusitis.

Is facial pain always sinusitis?

No. Facial pressure can also come from migraine, tension headache, dental problems, or jaw joint issues. If you have facial pain without nasal blockage or discharge, sinusitis is less likely and an examination helps find the real cause.

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.