A sinus infection feels like a cold that won’t quit, with added pressure and pain centered in your face. The hallmark signs are thick, discolored nasal mucus, a stuffed-up nose that makes it hard to breathe, and a painful, heavy feeling around your eyes, cheeks, or forehead that gets worse when you lean forward. If those symptoms have been hanging around for 10 days or more without improving, you’re likely dealing with a sinus infection rather than a common cold.
The Core Symptoms
Three symptoms show up in nearly every sinus infection. The first is thick, yellow or greenish mucus draining from your nose or sliding down the back of your throat (called postnasal drip). The second is persistent nasal congestion, the kind where one or both nostrils feel completely blocked and you end up breathing through your mouth. The third is facial pain: pressure, tenderness, or swelling around the eyes, cheeks, nose, or forehead.
That facial pain has a distinctive quality. It tends to intensify when you bend forward, tilt your head, or even just move suddenly. The pressure can feel dull and constant, almost like your face is too full. If you press gently on your cheekbones or the bridge of your nose and the tenderness spikes, that’s a strong clue your sinuses are inflamed.
Beyond those three, sinus infections commonly cause ear pressure, headache, a cough (especially at night, from mucus dripping into your throat), bad breath, fatigue, a foul taste in your mouth, and a reduced sense of smell or taste. Tooth pain is another surprisingly common symptom. Your largest sinuses sit just above the roots of your upper back teeth, so when those sinuses swell, the inflammation can radiate into your jaw and make it feel like you have a toothache.
Sinus Infection vs. a Cold
A regular cold and a sinus infection share a lot of the same symptoms early on, which is why timing matters more than any single symptom. A cold typically starts improving within five to seven days. A sinus infection either keeps going past the 10-day mark without getting better, or it follows a “double worsening” pattern: you start feeling better after a week, then suddenly get worse again with renewed congestion, facial pain, or fever.
That second wave is one of the most reliable clues. If your cold seemed to be clearing up and then came roaring back, the likely explanation is that a bacterial infection has taken hold in sinuses that were already irritated by the virus.
Green Mucus Doesn’t Mean What You Think
One of the most persistent myths is that yellow or green mucus means you have a bacterial infection and need antibiotics. It doesn’t. Both viral and bacterial infections change the color and consistency of nasal mucus. The color comes from white blood cells fighting the infection, not from bacteria specifically. Viruses cause the vast majority of upper respiratory infections in both children and adults, and antibiotics do nothing against viruses, regardless of what color your mucus is.
Mucus color is still worth paying attention to as one piece of the puzzle, but it can’t tell you on its own whether your infection is bacterial or viral. Even your doctor can’t make that call based on symptoms or a physical exam alone. The timeline of your illness is a far more useful indicator.
When It Might Be Bacterial
Most sinus infections start as viral. Only a fraction develop into bacterial infections that might benefit from antibiotics. The signs that suggest a bacterial infection include symptoms that persist for 10 to 14 days without any improvement, symptoms that worsen after an initial period of getting better, or a high fever (above 102°F / 39°C) paired with facial pain and discolored discharge lasting three or more consecutive days.
If your symptoms are steadily improving, even slowly, that’s a good sign the infection is resolving on its own. The concern is when there’s no improvement at all, or when things take a clear turn for the worse after a week.
A Simple Self-Check
You can get a rough sense of sinus involvement with a couple of easy checks at home. Lean forward slowly from a seated position so your head drops toward your knees. If the pressure or pain in your face noticeably increases, that suggests your sinuses are swollen and possibly filled with fluid. You can also gently press on the areas just below your eyes, alongside your nose, and above your eyebrows. Tenderness in those spots corresponds to different sinus cavities: cheekbone tenderness points to the maxillary sinuses, pain between your eyes to the ethmoid sinuses, and forehead tenderness to the frontal sinuses.
These aren’t definitive diagnostic tests, but combined with your other symptoms and how long you’ve been sick, they give you a reasonable picture of what’s going on.
How Sinus Infections Show Up in Children
Kids don’t always describe sinus pain the way adults do. In children, the biggest red flag is a cold with nasal discharge, a daytime cough, or both that lasts more than 10 days without improving. Children are also more likely to present with irritability, fatigue, and swelling around the eyes rather than clearly reporting facial pressure. A typical childhood cold resolves in about seven days, so symptoms lingering well past that window should get a closer look.
Acute vs. Chronic Sinus Infections
An acute sinus infection lasts less than four weeks and is usually triggered by a cold. Most resolve within two to three weeks, with or without treatment. Subacute infections drag on for four to twelve weeks.
If your symptoms persist for 12 weeks or longer, the condition is classified as chronic sinusitis. Chronic sinusitis isn’t just one long infection. It’s ongoing inflammation of the sinuses that can be driven by allergies, nasal polyps, a deviated septum, or other structural issues. The symptoms are similar to acute sinusitis (congestion, facial pressure, reduced smell, postnasal drip) but tend to be less intense and more constant. Chronic sinusitis requires a different treatment approach than a one-time acute infection.
Warning Signs That Need Urgent Attention
Sinus infections rarely become dangerous, but complications can develop when the infection spreads beyond the sinuses. Get medical attention promptly if you experience a fever above 104°F (40°C), severe headache that doesn’t respond to pain relievers, significant swelling or redness around one or both eyes, vision changes like double vision or difficulty seeing, a stiff neck, or confusion. These can signal that the infection has spread toward the eye socket or the brain, which requires immediate treatment.