Sinus Infection Symptoms: How to Tell What You Have and When to Worry

Your face feels heavy, your nose won't clear, and that pressure behind your cheeks gets worse every time you lean over the sink. You're wondering if this is just a bad cold or an actual sinus infection. The good news: most sinus infections are uncomfortable but harmless, and the majority clear up on their own without antibiotics.

Here's what to look for, how to tell a viral infection from one that needs medical care, and the warning signs that mean it's time to call a clinician.

What are the most common sinus infection symptoms?

A sinus infection, or sinusitis, happens when the lining of your sinuses becomes inflamed and swollen. That swelling blocks normal drainage, so mucus backs up and builds pressure inside your face. Doctors lean on four cardinal symptoms to recognize it.

If you have several of these together, especially the thick, discolored drainage paired with facial pressure, a sinus infection is the likely culprit rather than a simple cold.

• Thick, discolored nasal discharge (yellow or greenish, not clear) or postnasal drip down the back of your throat
• Nasal congestion or obstruction that makes it hard to breathe through your nose
• Facial pain, pressure, or fullness around your eyes, cheeks, nose, or forehead, often worse when you bend over
• A reduced sense of smell and taste
• Other common symptoms: headache, ear pressure, cough, tooth pain, bad breath, and fatigue

How long do sinus infection symptoms last?

Acute sinusitis usually runs its course quickly. Symptoms typically last 7 to 10 days and resolve within a week to 10 days unless a bacterial infection develops. By definition, an acute sinus infection lasts less than four weeks.

If your symptoms drag on much longer, the picture changes. Chronic sinusitis is defined by symptoms that persist for 12 weeks (about three months) or longer despite treatment. That duration is the main line doctors use to separate chronic sinusitis from an ordinary acute case, and it's a reason to see a clinician rather than wait it out.

Viral vs. bacterial: is it a cold or something more?

This is the question that matters most, because it determines whether antibiotics could help. Here's the surprising part: 90% to 98% of acute sinus infections are caused by viruses, not bacteria. That means most sinus infections will not benefit from antibiotics and will improve on their own.

A bacterial infection becomes more likely in a few specific situations. Recognizing this 'double-sickening' pattern, where you start to recover and then take a turn for the worse, is one of the clearest clues that something more than a virus is going on.

• Symptoms persist 10 or more days without any improvement
• Severe symptoms with a fever of 102 F (39 C) or higher, plus thick discolored discharge and facial pain, lasting 3 to 4 days in a row
• A 'double-sickening' pattern: you start to feel better, then worsen again after 5 to 6 days

How are sinus infections treated?

Because most cases are viral, treatment usually focuses on comfort and helping your sinuses drain while your body clears the infection. Saline rinses, steam, staying hydrated, rest, and over-the-counter symptom relief are the everyday backbone of care for a typical acute infection.

Antibiotics are reserved for cases where a bacterial infection is genuinely suspected, based on the patterns above. They are not a default fix, and overusing them does more harm than good. Sinus infections are the fifth most common reason antibiotics are prescribed, which is exactly why guidelines push clinicians to confirm a bacterial cause first. A clinician can help you decide whether your symptoms warrant a prescription or simply more time and supportive care.

When should you see a doctor?

Most sinus infections don't need a visit. But certain signs mean you should get evaluated rather than ride it out at home. Reach out to a clinician if any of the following apply to you.

• Symptoms that last more than 10 days without improving
• Severe symptoms, or a persistent fever of 102 F (39 C) or higher
• Symptoms that improve and then get worse again
• Symptoms that keep coming back, or that last 12 weeks or longer
• Seek urgent or emergency care for warning signs like swelling or redness around the eyes, vision changes, a severe headache, confusion, stiff neck, or trouble seeing, which can signal a rare but serious complication