A sinus infection feels like a cold that won’t quit, with added pressure and pain concentrated in your face. The key distinction is timing: most colds improve within 7 to 10 days, while a sinus infection either lingers beyond that window or gets better briefly before getting worse again. Understanding the specific pattern of your symptoms, where your pain is located, and how long you’ve been sick can help you figure out whether you’re dealing with something that needs medical attention.
The Timeline Is Your Best Clue
Viruses cause most sinus infections, and they typically clear up on their own within a week to 10 days. The real question most people are trying to answer isn’t “do I have a sinus infection?” but rather “do I have a bacterial sinus infection that needs treatment?” There are two reliable patterns that point toward a bacterial cause.
The first is simple persistence. If your symptoms have lasted at least 10 days without any improvement, that’s a strong signal. Not 10 days total, but 10 days with no trend in the right direction. A viral infection should be at least somewhat better by then.
The second pattern is what doctors call “double sickening,” a biphasic illness. You start feeling better around day 5 or 6, then suddenly worsen. New fever, worsening congestion, return of facial pain. This rebound is a hallmark of a bacterial infection settling in after the initial viral one.
Either of these patterns, along with severe symptoms like intense headache or facial pain, or a fever lasting longer than 3 to 4 days, is reason to see a healthcare provider.
Where the Pain Is and What It Means
Sinus infections produce pain and pressure in specific parts of your face, depending on which sinus cavities are inflamed. The most common type affects the sinuses behind your cheekbones. That pain radiates upward toward your forehead or downward into your upper teeth, which is why some people initially think they have a dental problem. Pressing on the area just below your eyes or along your cheekbones will feel tender.
A useful self-check: bend forward at the waist. If the pressure and pain in your face noticeably intensifies when you lean down, that’s a classic sign of sinus involvement. The shift in position increases pressure inside already-swollen sinus cavities. Straining, like lifting something heavy, produces the same effect.
Loss of smell is another telltale sign. When your sinuses are inflamed and blocked, odor molecules can’t reach the receptors high in your nasal passages. Allergies can also reduce your sense of smell, but a near-complete loss is more typical of sinusitis.
Sinus Infection vs. Allergies
Allergies and sinus infections share congestion and a runny nose, so they’re easy to confuse. The fastest way to tell them apart is itching. Allergies make things itch: your eyes, the corners of your nose, the back of your throat. You’re sneezing repeatedly, rubbing your eyes, and the discharge from your nose is typically thin and clear. A sinus infection doesn’t feel itchy. It feels heavy, pressurized, and painful.
Nasal discharge offers another hint. Yellow or green mucus is more common with sinus infections than with allergies, which tend to produce clear, watery drainage. That said, mucus color alone isn’t a reliable diagnostic tool. Both viral and bacterial infections can turn your mucus greenish or yellow. Green mucus does not automatically mean you need antibiotics, a myth that persists even among some clinicians, according to Mayo Clinic experts. Your immune system’s white blood cells produce that color change as they fight any infection, viral or bacterial.
Fever is another separator. Allergies don’t cause fevers. If you have a fever along with facial pressure and thick nasal discharge, you’re likely dealing with an infection rather than an allergic reaction.
Sinus Infection vs. a Regular Cold
This is trickier, because most sinus infections start as colds. A cold virus inflames the nasal passages, blocks normal sinus drainage, and creates the conditions for a sinus infection to develop. In the early days, the two look identical.
The distinguishing features emerge over time. A cold tends to peak around day 3 or 4 and then gradually improve. A sinus infection either plateaus or worsens. The facial pain and pressure of sinusitis is also more pronounced than what a typical cold produces. If your cold symptoms have shifted from general stuffiness to localized pain in your cheeks, forehead, or between your eyes, your sinuses are likely involved.
Signs in Children
Kids get sinus infections too, but they don’t always describe their symptoms the way adults do. In children, the most common signs include persistent nasal congestion with yellow or green discharge, a cough that won’t go away (especially at night, from mucus dripping down the back of the throat), fever, and headache or facial pain. Younger children may just seem generally irritable or tired. Mouth breathing and snoring that weren’t there before can also indicate blocked sinuses.
One important warning sign in children: if your child develops swelling or redness around an eye along with a high fever, or if one eye appears to be bulging, go to the emergency room. This can indicate orbital cellulitis, a serious complication where infection spreads from the sinuses into the tissue around the eye. It’s rare but requires immediate treatment to prevent vision loss.
Acute, Subacute, and Chronic
Sinus infections are categorized by how long they last. Acute sinusitis lasts less than four weeks and clears up with appropriate care. Subacute sinusitis lingers for four to eight weeks, often because initial treatment didn’t fully resolve the problem. Chronic sinusitis means symptoms have persisted for 12 weeks or longer.
Chronic sinusitis doesn’t always feel like an acute infection. The intense facial pain may fade into a duller, constant pressure. Congestion becomes your baseline rather than an event. Loss of smell may become persistent. If you’ve had recurring sinus infections or months of low-grade sinus symptoms, that pattern itself is worth discussing with a provider, as chronic sinusitis sometimes involves structural issues, nasal polyps, or ongoing inflammation that won’t resolve on its own.
When Antibiotics Actually Help
Because most sinus infections are viral, antibiotics won’t help the majority of cases. Doctors typically reserve antibiotics for situations where symptoms have persisted at least 10 days without improvement, or where the double-sickening pattern is present. Starting antibiotics too early for a viral infection won’t speed your recovery and contributes to antibiotic resistance.
In the meantime, the symptoms of a viral sinus infection respond to the same strategies as a bad cold: saline nasal rinses to flush out mucus, staying well hydrated, using a humidifier, and over-the-counter pain relievers for the facial pressure. Decongestant sprays can provide short-term relief but shouldn’t be used for more than a few days, as they can cause rebound congestion that makes things worse.