Sinus Infection (Sinusitis) Explained: Symptoms, Causes, and When to Seek Help

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🩺 Medically reviewed by the Health Decoded Guide Editorial Team · Last reviewed: July 2026

πŸ” Quick Summary

A sinus infection (sinusitis) is inflammation of the air-filled spaces in the face.

It often causes facial pain, pressure, and blocked nose.

1️⃣ Introduction

Sinusitis is inflammation of the sinuses.

• sinuses are air-filled spaces in the skull
• located around the nose, cheeks, and forehead
• can become blocked and infected

πŸ‘‰ Blocked sinuses lead to pressure and discomfort.

2️⃣ How it happens

Sinus infections develop when drainage is blocked.

• mucus builds up in the sinuses
• bacteria or viruses may grow
• pressure increases inside the sinuses

πŸ‘‰ This leads to pain and congestion.

3️⃣ Types 

• Acute sinusitis

  • lasts less than 4 weeks
  • often follows a cold

• Chronic sinusitis

  • lasts more than 12 weeks
  • symptoms may be persistent

πŸ‘‰ Duration helps determine management.

4️⃣ Common causes

• Viral infections

• Bacterial infections

  • may develop after a viral infection
  • less common than viral sinus infections

• Allergies

  • hay fever (allergic rhinitis)
  • dust, pollen or pet allergies

• Nasal blockage

  • nasal polyps
  • deviated nasal septum
  • enlarged adenoids (especially in children)

• Dental infections

  • infection of the upper back teeth can sometimes spread to the nearby sinuses

• Smoking and air pollution

  • cigarette smoke
  • second-hand smoke
  • polluted air or chemical irritants

5️⃣ Symptom 

• facial pain or pressure
• blocked or stuffy nose
• thick nasal discharge

πŸ‘‰ Symptoms occur due to mucus build-up and pressure in sinuses.

6️⃣ Associated symptoms

• headache
• reduced sense of smell
• fever
• fatigue

πŸ‘‰ These symptoms reflect inflammation and infection.§

7οΈβƒ£πŸ©Ί When to seek urgent medical help 🚨

Seek medical attention if you develop:

• severe facial pain or swelling
• swelling or redness around the eyes
• vision changes or double vision
• high fever
• symptoms lasting more than 10 days without improvement, or getting worse after initially improving

πŸ‘‰ These may indicate:
• a bacterial sinus infection
• the infection spreading beyond the sinuses
• the need for medical treatment, including antibiotics or further assessment

8️⃣ Management / treatment

Treatment depends on the cause and how severe the symptoms are.

• rest and drink plenty of fluids
→ helps your body recover and keeps mucus thinner

• nasal saline rinses or saline sprays
→ help clear mucus and reduce nasal congestion

• pain relief medication
→ medicines such as paracetamol or ibuprofen may help relieve facial pain, headache and fever (if suitable for you)

• nasal steroid sprays
→ may be recommended, especially if allergies or nasal inflammation are contributing to symptoms

• antibiotics
→ usually not needed because most sinus infections are caused by viruses. They may be prescribed if a bacterial infection is suspected.

πŸ‘‰πŸ½ Most viral sinus infections improve on their own within 7–10 days. If symptoms are severe, last more than 10 days, or get worse after initially improving, seek medical advice.

9️⃣ Diagnosis

• clinical assessment
• symptom history
• imaging rarely needed

πŸ‘‰ Diagnosis is usually based on symptoms.

🟒 Important message

Most sinus infections improve on their own.

πŸ‘‰ Persistent or severe symptoms should be evaluated.

FAQ

• Do sinus infections need antibiotics?
Not always—many are viral and resolve without antibiotics.

• Can allergies cause sinus problems?
Yes, they can block sinuses and lead to symptoms.

• How long does a sinus infection last?
Most viral sinus infections improve within 7–10 days. Symptoms lasting more than 10 days or getting worse may suggest a bacterial infection.

• When should I see a doctor for a sinus infection?
See a healthcare professional if symptoms last more than 10 days, become severe, keep coming back, or you develop swelling around the eyes, severe headache or vision changes.

• Can a sinus infection go away on its own?
Yes. Many sinus infections are caused by viruses and improve without antibiotics. Rest, fluids and symptom relief are often enough.

πŸ”— Related Health Topics

• Headache
• Common cold
• Flu (influenza)
• Conjunctivitis
• Allergies

πŸ“š Medical References

• HealthLink BC. Sinusitis.
• National Health Service (NHS). Sinusitis (sinus infection).
• Mayo Clinic. Chronic sinusitis - Symptoms and causes.
• National Institute for Health and Care Excellence (NICE). Sinusitis (acute): antimicrobial prescribing (NG79).
• American Academy of Otolaryngology–Head and Neck Surgery (AAO-HNS). Clinical Practice Guideline (Update): Adult Sinusitis.

⚠️ Medical Disclaimer

This article is for educational purposes only and does not replace professional medical advice.
If symptoms persist or worsen, consult a qualified healthcare professional.

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