The most reliable way to tell if you have a sinus infection is by tracking how long your symptoms last and whether they follow a specific pattern. A regular cold improves within 7 to 10 days. If your congestion, facial pressure, and nasal discharge persist beyond 10 days without getting better, or if your symptoms improve and then suddenly get worse again, you’re likely dealing with a sinus infection rather than a simple cold.
Symptoms That Point to a Sinus Infection
Sinus infections and colds share many of the same symptoms early on, which is why the first few days can feel identical. But sinus infections produce a distinct cluster of symptoms that goes beyond typical cold stuffiness. The hallmark signs include facial pressure or pain, thick yellow or green nasal discharge, a reduced sense of smell, headache, fatigue, and sometimes pain in the upper teeth. Fever can appear but isn’t always present.
That said, one of the most persistent myths about sinus infections is that green or yellow mucus means you have a bacterial infection. It doesn’t. Both viruses and bacteria can change the color and thickness of nasal mucus, so discharge color alone is not a reliable way to distinguish between the two. What matters more is the timeline and severity of your symptoms, not what color is on your tissue.
Where Your Face Hurts Tells You Which Sinuses Are Involved
You have four pairs of sinus cavities in your skull, and where you feel pain or pressure can help you identify which ones are inflamed:
- Forehead pain: frontal sinuses, located just above your eyebrows
- Cheekbone pain or upper tooth pain: maxillary sinuses, sitting below your cheekbones on either side of your nose
- Pain at the bridge of your nose: ethmoid sinuses, between your eyes
- Pain behind your eyes or in your ears: sphenoid sinuses, deeper in your skull
You can check for tenderness at home by gently pressing with your thumb in a circular motion just below each eyebrow (avoiding the eye socket) and then below the cheekbones slightly to either side of your nose. If pressing produces noticeable pain or tenderness beyond mild pressure, that’s a sign those sinuses are inflamed. Many people also notice that the pain worsens when they bend forward, because the shift in position increases pressure in the swollen cavities.
Cold vs. Sinus Infection: The Three Patterns
Doctors use three specific patterns to distinguish a bacterial sinus infection from a viral cold. If your symptoms match any one of these, a sinus infection is the likely explanation.
Persistent symptoms: Your congestion, nasal discharge, or daytime cough has lasted more than 10 days with no sign of improvement. A cold that’s still at full strength after 10 days has probably become a sinus infection.
Severe onset: You develop a fever of 102°F (39°C) or higher along with thick nasal discharge and facial pain that lasts three to four consecutive days. This pattern suggests bacteria are involved from early on.
Double sickening: You start to feel better after five to six days of a cold, then your symptoms come roaring back. You might develop a new fever, worsening congestion, or a cough that had been fading. This “double sickening” pattern, where improvement reverses between days 5 and 10, is one of the strongest indicators of a bacterial sinus infection.
What You Can Do at Home
Most sinus infections start as viral infections, and viruses don’t respond to antibiotics. Even when bacteria are involved, guidelines from the CDC recommend a period of watchful waiting for uncomplicated cases before starting antibiotics, because many bacterial sinus infections resolve on their own.
In the meantime, several things can ease the pressure and help your sinuses drain. Saline nasal spray or a saline rinse (like a neti pot with distilled or sterile water) loosens mucus and flushes out irritants. Over-the-counter decongestants containing pseudoephedrine (oral tablets) or oxymetazoline (nasal sprays like Afrin) can shrink swollen nasal passages and relieve pressure. One important rule with decongestant nasal sprays: don’t use them for more than one week. Beyond that, they can cause rebound congestion that makes things worse.
Warm compresses across your forehead and cheeks, staying well hydrated, and sleeping with your head slightly elevated can also reduce pressure and help mucus drain more effectively.
Signs That Need Immediate Attention
Sinus infections rarely become dangerous, but the sinuses sit close to the eyes and brain, so infections can occasionally spread. Go to a doctor right away if you notice any of the following: pain, swelling, or redness around your eyes; double vision or other vision changes; a high fever that isn’t responding to treatment; a stiff neck; or confusion. These symptoms suggest the infection may be spreading beyond the sinuses and needs prompt evaluation.