Sinus Congestion: Causes and Relief

What sinus congestion is

The sinuses are air-filled spaces in the bones of the face: behind the cheeks (maxillary), above the eyes (frontal), between the eyes (ethmoid) and deep behind the nose (sphenoid). They are lined with mucus-producing tissue and drain into the nose through narrow openings.

When the lining of the nose swells, those openings block. Mucus builds up, pressure rises, and you feel:

• a stuffy or blocked nose
• pressure or fullness in the cheeks, forehead or between the eyes, worse when bending forward
• thick mucus in the nose or dripping down the throat (post-nasal drip)
• a reduced sense of smell and taste
• ear pressure or popping
• headache, toothache in the upper teeth, bad breath, and tiredness

Common causes

Common cold

A cold is the most frequent cause. Congestion peaks around days 3 to 5 and usually clears by day 10. Mucus often thickens and turns yellow or green, which is normal and does not mean you need antibiotics.

Allergies

Allergic rhinitis causes congestion with sneezing, an itchy nose and eyes, and clear watery discharge. It follows exposures to pollen, dust mites, pets or mold.

Acute sinusitis

Acute sinusitis is inflammation of the sinuses, usually after a cold. Most cases are viral. Bacterial sinusitis is more likely when:

• symptoms last more than 10 days without improving
• symptoms are severe from the start, with fever of 39 °C (102.2 °F) or more and facial pain for 3 to 4 days
• symptoms get better, then worse again

Rebound congestion

Using decongestant nasal sprays (oxymetazoline, xylometazoline) for more than 3 days can cause rhinitis medicamentosa, where the nose blocks again as each dose wears off.

Causes of congestion that won't go away

• Chronic sinusitis: congestion, facial pressure, discharge and reduced smell for 12 weeks or more.
• Nasal polyps: soft, painless growths that block both sides and dull the sense of smell, often with asthma.
• Deviated septum: a bent nasal partition causing one-sided blockage.
• Non-allergic rhinitis: congestion triggered by smells, temperature changes, alcohol or spicy food.
• Hormones: pregnancy rhinitis, hypothyroidism.
• Medicines: some blood pressure drugs, erectile dysfunction drugs, and hormonal contraceptives.
• Dental infections in the upper teeth spreading into the cheek sinus.
• Rarely, tumors: one-sided blockage with bleeding, numbness or a reduced sense of smell warrants an ENT exam.

Cold vs allergy vs sinusitis

How to relieve sinus congestion

Home remedies

• Saline rinse or spray: a squeeze bottle or neti pot flushes mucus and allergens. Use distilled, sterile or boiled and cooled water, never plain tap water.
• Steam: breathe steam from a shower or a bowl of hot water (carefully; not with young children).
• Warm compresses over the cheeks and forehead ease pressure.
• Stay hydrated to keep mucus thin.
• Raise your head with an extra pillow at night.
• Humidifier in dry indoor air; clean it regularly.

Over-the-counter medicines

• Steroid nasal sprays (fluticasone, budesonide, mometasone): the best option for allergy-related and chronic congestion; take a few days to work fully.
• Decongestant sprays: fast relief but no more than 3 days.
• Oral decongestants (pseudoephedrine): help some adults; avoid with high blood pressure, heart disease, glaucoma, prostate enlargement or pregnancy unless your doctor agrees. Phenylephrine tablets have been shown to be ineffective when taken by mouth.
• Antihistamines: help allergic congestion, not much for colds.
• Pain relievers: acetaminophen (paracetamol) or ibuprofen for facial pain. Follow the label dose.

Medical treatment

• Antibiotics only for likely bacterial sinusitis; many doctors first suggest watchful waiting for 7 days.
• Allergy testing and immunotherapy for persistent allergies.
• Prescription sprays and short courses of oral steroids for polyps.
• Sinus surgery (functional endoscopic sinus surgery) or septoplasty when chronic problems do not respond.

Frequently asked questions

How do I get rid of sinus congestion fast?

A decongestant nasal spray gives the fastest relief, but use it no more than 3 days. Saline rinses, steam, warm compresses and sleeping with your head raised also help quickly. For allergy-related congestion, a steroid nasal spray used daily works best.

How long does sinus congestion last?

Congestion from a cold usually improves within 7 to 10 days. Acute sinusitis can last up to 4 weeks. Congestion lasting more than 12 weeks is chronic sinusitis or another ongoing problem, and should be evaluated by a doctor.

When should I see a doctor for sinus congestion?

See a doctor if congestion lasts more than 10 days, gets worse after improving, comes with high fever or severe facial pain, or keeps returning. Get emergency care for eye swelling, vision changes, severe headache or a stiff neck.

Do I need antibiotics for a sinus infection?

Usually not. Most sinus infections are viral and clear on their own. Antibiotics help only bacterial sinusitis, suggested by symptoms lasting over 10 days, severe symptoms with high fever, or symptoms that worsen after starting to improve.

Why is only one side of my nose blocked?

The nose normally alternates which side is more open every few hours (the nasal cycle). Persistent one-sided blockage can come from a deviated septum, a polyp or a foreign object in children. One-sided blockage with bleeding should be checked by an ENT.