A sinus infection produces three hallmark symptoms: thick, discolored nasal discharge combined with either nasal congestion or facial pain and pressure. If you have at least two of those at the same time, there’s a good chance your sinuses are inflamed and infected. But telling a sinus infection apart from a regular cold takes a closer look at what you’re feeling, where you’re feeling it, and how long it’s been going on.
The Core Symptoms to Look For
Sinus infections share many symptoms with colds, which is why they’re easy to confuse. The symptoms that point most strongly toward a sinus infection, rather than a simple cold, are:
- Thick, discolored nasal discharge. This can drain from the front of your nose or drip down the back of your throat. It’s often yellow, green, or cloudy white.
- Nasal congestion or obstruction. One or both sides of your nose feel blocked, and breathing through your nose is difficult.
- Facial pain or pressure. A deep, steady ache or fullness across your cheeks, forehead, or between your eyes.
- Reduced sense of smell. Foods taste bland, or you can’t smell things you normally would.
- Fever. More common with acute infections than chronic ones.
Beyond those primary signs, sinus infections can also cause headache, ear pressure or fullness, dental pain in your upper teeth, bad breath, cough (especially at night from post-nasal drip), and fatigue. These secondary symptoms alone don’t confirm a sinus infection, but when they show up alongside the core symptoms, they strengthen the picture.
Where the Pain Shows Up Matters
Your sinuses are paired air pockets in different parts of your face and skull, and the location of your pain can hint at which set is involved. Pain and tenderness across your cheeks, sometimes radiating to your teeth or forehead, points to your maxillary sinuses, the large ones behind your cheekbones. This is the most common type. You may notice the pain gets worse when you bend forward or strain.
Pain along the inner edge of your eyebrow or the lower forehead, with tenderness when you press near the inner corner of your eye socket, suggests the frontal sinuses. This type often comes with fever. Pain at the top of your head or deep behind your eyes is less common and can indicate the sphenoid sinuses, located further back in the skull.
How to Tell It Apart From a Cold
Almost every sinus infection starts as a viral cold. The key difference is what happens after the first week. A typical cold improves steadily after about 7 days. A sinus infection either keeps going without improvement past 10 days, or follows a “double worsening” pattern: you start feeling better, then get noticeably worse again with new facial pressure, thicker discharge, or a returning fever.
The CDC flags symptoms lasting more than 10 days without improvement as the clearest signal that a cold has progressed into a sinus infection that may need treatment. If your symptoms peaked around day 3 or 4 and have been gradually fading since, that’s a normal cold running its course.
Green Mucus Doesn’t Mean What You Think
One of the most persistent misconceptions is that yellow or green mucus means you have a bacterial infection that needs antibiotics. It doesn’t. Your mucus naturally changes color as your immune system fights any infection, viral or bacterial. White blood cells contain enzymes that tint mucus green as they break down, and this happens whether a virus or bacteria caused the problem. You cannot reliably distinguish a viral sinus infection from a bacterial one based on mucus color alone.
What matters more than color is the full pattern: how long symptoms have lasted, whether they’re getting worse instead of better, and whether you have significant facial pain alongside the discharge.
Can You Check Your Sinuses at Home?
You might be tempted to press on your cheeks and forehead to test for tenderness, and while this can give you a rough sense of what’s going on, it’s not particularly reliable as a diagnostic tool. Studies show that facial palpation and even clinical transillumination (shining a light through the sinuses) have limited predictive value. Tenderness when you press over your cheekbones or the inner part of your brow ridge is consistent with sinus inflammation, but its absence doesn’t rule it out.
The most useful self-assessment is tracking your symptom timeline. Note when your symptoms started, whether they’ve improved or worsened, and whether you have the combination of discharge plus congestion or facial pressure. That information is more diagnostically useful than any physical test you can do in front of the bathroom mirror.
When Symptoms Last Months, Not Weeks
If nasal congestion, facial pressure, discolored drainage, or a reduced sense of smell persist for 12 weeks or longer, the condition shifts from acute to chronic sinusitis. Chronic sinusitis doesn’t always feel as intense day to day. The pain may be duller, the discharge less dramatic. But the symptoms simply don’t go away, or they keep cycling back before fully resolving. Chronic sinusitis requires a different treatment approach and typically needs imaging or a nasal endoscopy to evaluate what’s keeping the inflammation going, whether that’s nasal polyps, allergies, or structural issues.
Symptoms That Need Immediate Attention
Most sinus infections resolve on their own or with straightforward treatment. But the sinuses sit close to your eyes and brain, and in rare cases infection can spread. Swelling or redness around your eyes, double vision or other vision changes, severe headache, forehead swelling, a stiff neck, or confusion are all signs of a potentially serious complication. High fever alongside any of these warrants urgent care, not a wait-and-see approach.