A sinus infection produces a recognizable pattern: thick discolored nasal discharge, facial pressure or pain, and congestion that won’t quit. If you have at least two of those major symptoms, or one major symptom plus a couple of smaller ones like headache, cough, or ear pressure, you’re likely dealing with sinusitis. Here’s how to read your symptoms, check yourself at home, and figure out whether you need medical help or just time.
The Core Symptoms to Look For
Sinus infections cause a cluster of symptoms, and the more you have, the more confident you can be in the diagnosis. The major ones are thick yellow or green discharge from your nose (or dripping down the back of your throat), nasal congestion or blockage, a feeling of fullness or pressure in your face, facial pain, a reduced sense of smell, and fever. You don’t need all of these. Two major symptoms together are enough to point toward sinusitis.
Then there are the secondary symptoms that fill in the picture: headache, ear pain or fullness, bad breath, upper tooth pain, cough, and fatigue. On their own, these don’t scream “sinus infection.” But if you have one major symptom plus two or more of these, you’re in the same diagnostic territory. A persistent cough that worsens at night, for instance, often comes from infected mucus draining down your throat while you sleep.
Where It Hurts and Why
The location of your pain tells you which sinuses are inflamed. Your forehead, just above your eyebrows, houses the frontal sinuses. If you feel pressure or aching there, those are likely the culprits. The maxillary sinuses sit beneath your eyes, on either side of your nose, inside the cheekbone area. Inflammation there produces a deep ache in your cheeks or a strange soreness in your upper back teeth.
That tooth pain catches many people off guard. The roots of your upper molars sit extremely close to the floor of your maxillary sinuses, and some roots actually extend into the sinus cavity itself. When the sinus lining swells, it presses on those roots and mimics a toothache. A key clue: sinus-related tooth pain typically affects several upper teeth at once rather than a single tooth. If just one tooth hurts sharply, that’s more likely a dental problem.
A Simple Self-Check
You can get a rough sense of sinus involvement by gently pressing on specific spots. Use your fingertips to apply light pressure just above each eyebrow (frontal sinuses) and on the flat of each cheekbone below your eyes (maxillary sinuses). If pressing produces a dull, deep tenderness or worsens the pressure you already feel, those sinuses are probably inflamed. This isn’t a definitive test, but combined with your other symptoms, it adds useful information.
Also pay attention to what happens when you lean forward. Bending over to tie your shoes or pick something up often intensifies sinus pressure noticeably. That positional worsening is a classic sign.
Cold, Allergies, or Sinus Infection?
Most sinus infections start as a plain cold, which makes the early days hard to distinguish. A cold typically peaks around days three to four and then gradually improves. Allergies cause sneezing, clear watery discharge, and itchy eyes, but they don’t produce fever or thick colored mucus. A sinus infection, by contrast, either sticks around longer than a cold should or gets worse after an initial improvement.
Three patterns suggest your cold has crossed into sinus infection territory:
- The 10-day rule. Your symptoms have lasted 10 days or more without meaningful improvement. A normal cold should be clearly getting better by then.
- Severe onset. You develop a fever of 102°F (39°C) or higher along with thick, discolored nasal discharge that persists for at least three to four days right from the start.
- Double sickening. You start feeling better after five or six days of a typical cold, then suddenly worsen again with new fever, increased discharge, or returning headache. This rebound pattern strongly suggests bacteria have moved in.
Most Sinus Infections Are Viral
Here’s something worth knowing before you head to urgent care for antibiotics: a large portion of sinus infections are caused by viruses, not bacteria, and antibiotics do nothing for viruses. Even among patients whose symptoms are severe enough to meet clinical criteria for bacterial sinusitis, studies using direct sinus sampling find bacteria only about half the time. That means roughly half of cases that look bacterial are still viral.
This matters because viral sinus infections resolve on their own, usually within seven to ten days. The three timeline patterns above (persistent, severe, or double-sickening) are the markers doctors use to identify the cases where bacteria are more likely involved and antibiotics might actually help. If your symptoms don’t match any of those patterns, you’re almost certainly fighting a virus, and the best approach is managing your symptoms while your immune system does its work.
What Actually Helps in the Meantime
Saline nasal irrigation, either with a squeeze bottle or a neti pot, physically flushes out mucus and reduces congestion. It’s one of the most consistently effective home treatments. Use distilled or previously boiled water, never straight tap water. A warm compress over your forehead and cheeks can ease the pressure temporarily. Steam from a hot shower loosens thick mucus, and staying well hydrated keeps your mucus thinner and easier to drain.
Over-the-counter decongestant sprays provide fast relief but shouldn’t be used for more than three days. Beyond that, they can cause rebound congestion that’s worse than what you started with. Oral decongestants and pain relievers like ibuprofen or acetaminophen can help you get through the worst days more comfortably.
When Your Symptoms Need Professional Attention
Most of the time, a doctor diagnoses a sinus infection based entirely on your symptoms and a physical exam. Imaging isn’t routine. CT scans are reserved for cases where surgery is being considered, where complications are suspected, or where treatment has failed and the doctor needs a detailed look at what’s happening inside. A scope passed into the nose (nasal endoscopy) is sometimes used as a middle step, particularly if symptoms have been dragging on for months.
Certain symptoms, however, signal that the infection may be spreading beyond your sinuses and needs urgent evaluation. Swelling or redness around your eye, vision changes like double vision or decreased sight, a severe headache that’s unlike your typical sinus pressure, a stiff neck, or high fever with confusion are all signs that the infection could be affecting your eye socket or the tissue around your brain. These complications are uncommon but serious, and they require same-day medical attention.
Acute vs. Chronic: Know the Difference
An acute sinus infection lasts less than four weeks and usually follows a cold. It’s the type most people are wondering about when they search their symptoms. Chronic sinusitis, by contrast, means symptoms have persisted for 12 weeks or longer. The causes overlap somewhat, but chronic cases are more often driven by ongoing inflammation, nasal polyps, or structural issues rather than a single infection. If your congestion, facial pressure, and reduced sense of smell have been hanging around for months, that’s a different situation that benefits from a specialist’s evaluation rather than another round of antibiotics.