The three strongest signs of a sinus infection are thick, discolored nasal discharge combined with either nasal congestion or facial pain and pressure. A regular cold shares some of these symptoms, but the pattern, timing, and intensity differ in ways you can learn to recognize.
The Core Symptoms
Sinus infections center on three hallmark symptoms: purulent (thick, colored) nasal discharge, a blocked or stuffy nose, and pain or pressure in the face. You might feel that pressure around your eyes, across your cheeks, in your forehead, or across the bridge of your nose. It typically gets worse when you bend forward. If you have discolored drainage plus either congestion or facial pressure, that combination is the most reliable indicator of a sinus infection.
Beyond those core three, sinus infections commonly cause ear pressure or fullness, aching in the upper teeth, bad breath, a reduced sense of smell, cough, fatigue, and fever. An isolated headache without the other symptoms is actually not a typical sign of sinusitis, despite what many people assume. Facial pressure is far more characteristic than a headache on its own.
Sinus Infection vs. a Cold
Colds and sinus infections overlap so much in the first few days that even doctors can’t always tell them apart early on. Both cause congestion, runny nose, and general misery. The key difference is timing. A cold typically peaks around days three to five and then gradually improves. A sinus infection either lingers well past the 10-day mark without getting better, or follows a “double sickening” pattern: you start to improve, then suddenly get worse again with new facial pressure, thicker discharge, or a returning fever.
If your symptoms have persisted beyond 10 to 14 days without meaningful improvement, that’s usually the point where a viral cold has crossed into bacterial sinus infection territory. A sudden worsening after initial improvement is another strong signal, even if you haven’t hit the 10-day mark yet.
What Mucus Color Actually Tells You
Green or yellow mucus is one of the most commonly misread signs. Many people, and even some clinicians, treat discolored mucus as proof of a bacterial infection. It isn’t. Both viral and bacterial infections cause the same changes in mucus color. Your body produces greenish or yellowish discharge because of enzymes released by white blood cells fighting the infection, not because bacteria are present. Mucus color alone is not a reason to take antibiotics, and antibiotics do nothing against viral infections regardless of what color your mucus is.
That said, thick, discolored discharge combined with other symptoms like persistent facial pressure and a timeline that fits (beyond 10 days or worsening after improvement) does make a bacterial sinus infection more likely.
Where the Pain Shows Up
Different sinuses produce pain in different locations, which can help you pinpoint what’s going on. The maxillary sinuses, located in your cheekbones, are the most commonly affected. They cause pain or tenderness across the cheeks and can radiate into the upper teeth, sometimes mimicking a dental problem. The frontal sinuses sit above your eyes and cause forehead pressure. The ethmoid sinuses, between your eyes, produce pain at the bridge of the nose. In rare cases, the sphenoid sinuses deep behind the nose can cause pain at the back of the head or the top of the skull.
You can gently press on your cheekbones or forehead to check for tenderness, though medical studies have found that this test isn’t particularly reliable on its own. It’s more useful as one piece of the puzzle alongside your other symptoms and their timeline.
Signs in Children
Kids, especially younger ones, don’t always present with the classic adult symptoms. Instead of complaining about facial pressure, a young child with a sinus infection may be irritable, lose their appetite, have bad breath, or develop a nasal-sounding voice. The most common pattern is a cold that simply won’t quit: nasal congestion and cough that persist past 10 days without improvement.
One detail worth noting is that the cough should be present during the daytime, though it often worsens at night. A cough that happens only at night is more likely related to postnasal drip or asthma than to a sinus infection. Older children and teenagers tend to report symptoms more similar to adults, including headache and facial pressure.
Acute vs. Chronic Sinus Infections
An acute sinus infection lasts up to four weeks and is what most people are dealing with when they search for symptoms. If your symptoms persist for 12 weeks or longer, the condition is classified as chronic sinusitis. Chronic sinusitis affects roughly 29 million adults in the United States each year, about 12% of the adult population. It requires at least two of the following symptoms lasting 12 weeks or more: thick or discolored drainage, nasal congestion, facial pain or pressure, or a decreased sense of smell.
Chronic sinusitis isn’t just a long cold. It involves ongoing inflammation of the sinus lining and often requires a different treatment approach than a single acute episode.
Symptoms That Need Urgent Attention
Most sinus infections resolve on their own or with straightforward treatment. But certain symptoms suggest something more serious. Swelling or redness around the eyes, vision changes, a stiff neck, severe headache, high fever, or confusion all warrant prompt medical evaluation. These can indicate that the infection has spread beyond the sinuses, which is uncommon but requires fast treatment.