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Sinus Infection: Symptoms, Causes and Treatment
A sinus infection (sinusitis) is inflammation of the air-filled cavities around the nose — often after a cold — that causes facial pressure, congestion, and thick mucus. Most cases are viral and improve with supportive care; some need medical treatment.
Where is sinus infection pain located?
Pressure sits in the forehead, cheeks, bridge of the nose, or behind the eyes — wherever the inflamed sinuses are. Upper teeth can ache when the maxillary sinuses are involved. Pain often feels worse when you bend forward.
What does a sinus infection feel like?
Many people describe a dull, heavy ache or full pressure rather than a sharp stab. The nose feels blocked; mucus may be thick and discolored. Smell can dull, and a cough from drip down the throat is common. Severity ranges from mild cold-like congestion to several days of pounding facial pain.
Common causes of sinus infection
- Viral upper respiratory infection (most common starting point)
- Bacterial infection after mucus stays trapped (less common)
- Allergies that swell nasal passages and block drainage
- Nasal polyps or a deviated septum that limit airflow
- Smoke, dry air, or swimming / diving pressure changes
- Dental infection spreading into the maxillary sinuses (uncommon)
Acute vs chronic sinusitis
Acute sinusitis lasts under about 4 weeks. Chronic sinusitis means symptoms drag on for 12 weeks or more, often with ongoing congestion and reduced smell — that pattern needs a clinician, not endless OTC cycling alone.
Viral vs bacterial
Most early sinus infections are viral. Antibiotics help only when a bacterial infection is likely (for example symptoms lasting beyond ~10 days without improvement, or a “double worsening” after a cold). Yellow-green mucus alone does not prove bacteria.
Allergies and blockage
Swollen, allergic nasal lining blocks drainage openings. Treating allergies and keeping passages moist often prevents repeat flares.
Sinus pain vs migraine
Facial pressure with a stuffy nose points toward sinuses. Throbbing pain with light sensitivity and nausea — and little congestion — may be migraine. Overlap happens; a clinician can help sort mixed patterns.
Symptoms that may occur with a sinus infection
- Pressure or pain in the face, forehead, or around the eyes
- Stuffy or blocked nose with thick yellow or green mucus
- Reduced smell or taste
- Post-nasal drip and cough
- Headache that worsens when bending forward
- Fatigue, mild fever, or sore upper teeth (upper sinuses)
When should you seek urgent medical help?
Get urgent care if:
- High fever with severe facial pain or swelling around one eye
- Vision changes, double vision, or a bulging eye
- Stiff neck, confusion, or severe headache unlike your usual cold
- Symptoms lasting more than 10 days without any improvement
- Symptoms that improve then suddenly get much worse (“double sickening”)
- Immune problems, recent facial trauma, or you feel systemically very unwell
How a sinus infection is diagnosed
Most acute cases are diagnosed from history and exam. Imaging is reserved for complications, chronic disease, or when the picture is unclear.
- Symptom timeline and nasal exam
- Allergy history when flares keep returning
- CT of the sinuses for chronic or complicated cases
- Nasal endoscopy in specialist care
- Cultures only in selected hard-to-treat infections
Treatment options
- Saline rinses / sprays to clear mucus and moisturize passages
- Pain relievers and fever reducers as labeled (if safe for you)
- Short-term decongestants or steroid nasal sprays when appropriate
- Allergy control if that is the driver
- Antibiotics only when a bacterial infection is likely — not by default
- Specialist care or surgery for chronic blocked sinuses in selected people
Can I manage a sinus infection at home?
Often yes— for typical viral sinusitis
Fluids, rest, saline rinses, and symptom relief help most mild-to-moderate cases. See a clinician if you are not improving after about 10 days, symptoms rebound hard, or any red-flag signs appear.
What helps at home
- Saline nasal rinse or spray several times a day
- Steam or a humidifier to loosen thick mucus
- Warm compress over the face for pressure relief
- Drink fluids and rest; sleep with the head slightly elevated
- Use OTC pain relief or a decongestant only as labeled — and not for long stretches
Avoid
- Demanding antibiotics on day one of a cold
- Days of oral decongestants without a break (rebound congestion risk)
- Skipping saline care while only taking pills
- Ignoring eye swelling, vision change, or a severe one-sided face swelling
Everything about sinus infection
Sinuses are hollow spaces lined with mucus membranes. When swelling blocks their drainage openings, mucus pools — pressure builds and germs can thrive. Colds start most acute episodes; allergies and anatomy keep some people looping back.
Color of mucus is a weak signal. Duration, fever pattern, facial swelling, and whether you improve then crash again matter more for deciding if antibiotics or imaging are needed.
This page is general information, not a personal diagnosis. Severe, one-sided, or eye-related symptoms need prompt care.
Frequently asked questions
Do I need antibiotics for a sinus infection?
Usually not at first. Most acute sinus infections are viral. Antibiotics are considered when symptoms last beyond about 10 days without improvement, get much worse after a brief recovery, or a clinician finds signs of bacterial disease.
Does green or yellow mucus mean I have a bacterial infection?
Not by itself. Discolored mucus is common with viral colds and inflammation. Color alone should not decide whether you take antibiotics.
How long does a sinus infection usually last?
Many viral cases improve within 7–10 days. Congestion can linger a bit longer. Symptoms past 10 days without progress, or lasting many weeks, deserve a medical check for chronic or bacterial sinusitis.
Can a sinus infection turn into something more serious?
Rarely, infection can spread toward the eye or brain. Red flags include eye swelling, vision changes, high fever with severe headache, stiff neck, or confusion — seek urgent care right away.
Informational only — not a diagnosis or treatment plan. Seek professional care for personal medical decisions.