A sinus infection feels like heavy, building pressure behind your face, especially around your cheeks, eyes, and forehead. That pressure typically worsens when you bend over or lean forward, and it’s often accompanied by thick nasal congestion, fatigue, and a dull headache that settles deep behind the bones of your face. Most sinus infections start as a common cold, so the early days can feel like any other upper respiratory illness before the telltale facial pressure takes over.
Where You Feel the Pressure
The specific location of your pain depends on which sinuses are inflamed. Your largest sinuses sit behind your cheekbones, and when they’re swollen, you’ll feel aching pressure across the middle of your face and into your upper teeth. The sinuses behind your forehead produce a deep, band-like headache above your eyebrows. And the smaller sinuses between your eyes, near the bridge of your nose, cause pain or swelling around and between the eyes when they’re affected. Many people describe the overall sensation as fullness or heaviness, as if their face is swollen from the inside out.
A hallmark feature is that this pressure intensifies when you change position. Bending down to tie your shoes, picking something up off the floor, or lying flat can all make the pain spike noticeably. That positional worsening is one of the clearest signals that what you’re feeling is sinus-related rather than a tension headache or general fatigue.
The Full Range of Symptoms
Facial pressure gets all the attention, but a sinus infection involves your whole head and often your whole body. Thick nasal discharge, either dripping from your nose or sliding down the back of your throat, is constant. Your sense of smell fades or disappears entirely, which also dulls your sense of taste. Breathing through your nose becomes difficult or impossible, forcing you to mouth-breathe, which dries out your throat and can make sleeping miserable.
Bad breath is surprisingly common during sinus infections. Mucus pooling in the back of your throat and bacteria in your sinuses create a stale, unpleasant odor that brushing your teeth won’t fix. Fatigue is another near-universal symptom. Your body is fighting an infection, and the combination of poor sleep from congestion and an active immune response leaves many people feeling wiped out for days.
A postnasal drip cough is also typical, especially at night. As mucus drains down the back of your throat, it triggers a persistent, irritating cough that tends to worsen when you lie down.
Why Your Teeth Might Hurt
One of the more confusing symptoms is aching in your upper back teeth. This happens because the roots of your upper molars sit very close to, or even extend slightly into, the sinus cavity above them. When that cavity fills with inflamed, swollen tissue, the pressure pushes directly on those tooth roots. The result feels remarkably like a toothache.
The key difference is that sinus-related tooth pain usually affects several upper teeth at once rather than a single tooth, and it comes alongside nasal congestion and facial pressure. If you’re unsure, a dentist can rule out cavities or gum disease first. If nothing dental explains the pain, a sinus infection is the likely culprit.
Sinus Headache vs. Migraine
Many people who think they have a sinus headache actually have a migraine. The confusion exists because migraines can also cause nasal congestion, a runny nose, and facial pressure. The distinguishing features matter. A true sinus headache comes with thick, discolored nasal discharge, reduced smell, and resolves as the infection clears. A migraine, on the other hand, causes throbbing or pulsating pain that worsens with physical movement, and it’s often accompanied by nausea, vomiting, and sensitivity to light, noise, or smells.
If your “sinus headaches” keep coming back without an actual infection, or if they respond to migraine medications, you’re likely dealing with migraines rather than sinus problems.
How It Progresses Over Time
Most sinus infections begin as viral infections, essentially a cold that settles into the sinuses. For the first several days, the symptoms overlap heavily with a standard cold: runny nose, mild congestion, general malaise. The sinus-specific pressure and thicker discharge typically develop a few days in and can linger for up to four weeks in an acute case.
A viral sinus infection usually starts improving within 10 days. If your symptoms haven’t improved at all by day 10, or if they get better for a few days and then suddenly worsen again (sometimes called “double worsening”), that pattern suggests a bacterial infection has developed on top of the original viral one. Bacterial sinusitis can also announce itself with a fever above 102°F, pain concentrated on one side of the face, and thick discharge that persists for three or more days.
One symptom strongly linked to bacterial infection is cacosmia, a foul smell that you detect yourself, distinct from typical bad breath. If everything suddenly smells rotten or putrid to you, that’s a meaningful signal.
What Mucus Color Actually Tells You
Green or yellow mucus is one of the most misunderstood symptoms. Many people assume that discolored mucus means they need antibiotics, but the color of your nasal discharge is not a reliable way to distinguish a bacterial infection from a viral one. Viral infections routinely produce yellow and green mucus as your immune system responds. The timing and pattern of your symptoms, not the color of your mucus, is what matters for determining whether bacteria are involved.
Acute, Subacute, and Chronic
Sinus infections are categorized by how long they last. Acute sinusitis covers symptoms lasting four weeks or less, and this is by far the most common type. Subacute sinusitis describes symptoms persisting for one to three months. Chronic sinusitis means symptoms and sinus inflammation have continued for longer than three months.
The experience shifts across these categories. Acute sinusitis tends to feel intense but self-limiting: several days of strong pressure and congestion that gradually improve. Chronic sinusitis is more subtle but more wearing. The pressure may be milder on any given day, but the relentless congestion, reduced smell, and fatigue drag on for months. People with chronic sinusitis often describe feeling like they have a permanent mild cold that never fully resolves.
Symptoms That Need Prompt Attention
Most sinus infections resolve on their own or with straightforward treatment, but certain symptoms suggest the infection has spread beyond the sinuses. Swelling or redness around the eye, vision changes like double vision or difficulty seeing, a severe headache that feels different from typical sinus pressure, a high fever that won’t come down, or a stiff neck all warrant urgent medical evaluation. These can indicate that the infection has reached the tissue around the eye or, rarely, the brain, both of which require immediate treatment.