Short answer: Sinusitis, more precisely rhinosinusitis, is inflammation of the tissues lining the nose and sinuses. Common symptoms include nasal blockage, thick nasal discharge, facial pressure or pain, and reduced sense of smell. Most acute cases are associated with viral infections and do not require antibiotics. Symptoms lasting more than 10 days without improvement, getting worse again after initial improvement, or continuing for more than 12 weeks may require more detailed evaluation.

Many people who have nasal congestion and facial pressure for a few days during a cold assume, “I have sinusitis and need antibiotics.” In reality, a large proportion of sinus symptoms are part of the normal course of a viral respiratory infection.

What are the sinuses?

The sinuses are air-filled spaces within the facial bones around the forehead, cheeks, and eyes. They communicate with the nasal cavity and are lined with mucosa that produces mucus.

Normally, mucus drains through small openings into the nose. Infection, allergy, or anatomical narrowing can cause the lining to swell, impair drainage, and create pressure or fullness.

What are the symptoms of sinusitis?

Common symptoms include:

  • Nasal blockage,
  • Thick discharge from the nose or down the throat,
  • Facial pressure, fullness, or pain,
  • Reduced sense of smell,
  • Headache,
  • Pressure in the upper jaw or teeth,
  • Cough,
  • Bad breath,
  • Tiredness.

Headache alone does not establish a diagnosis of sinusitis. Migraine and other headache disorders can also cause pressure around the eyes and face.

What is the difference between a cold and sinusitis?

Viral upper respiratory infections commonly cause a runny or blocked nose, sore throat, and cough. Symptoms may worsen during the first few days and then gradually improve.

Acute bacterial rhinosinusitis is more likely to be considered when:

  • Symptoms continue for more than 10 days without improvement,
  • Severe symptoms such as high fever and marked facial pain persist for several days,
  • The person begins to improve and then becomes significantly worse again.

A clinician makes this distinction based on the full clinical picture.

Does yellow or green discharge mean a bacterial infection?

No. Nasal mucus can become white, yellow, or green during viral infections as well. The color reflects factors such as immune cells and mucus concentration.

Discharge color alone is not a reason to start antibiotics.

What is the difference between acute and chronic sinusitis?

Acute rhinosinusitis generally lasts less than four weeks and is most often associated with viral infection.

Chronic rhinosinusitis refers to a different group of conditions in which symptoms continue for more than 12 weeks. Persistent nasal blockage, postnasal drainage, loss of smell, and facial fullness may be prominent.

Chronic sinusitis is not simply “an infection that never went away.” Allergy, nasal polyps, immune responses, and anatomical factors may contribute.

Can sinusitis cause headaches?

Inflammation of the sinuses can produce facial and head pressure. However, a proportion of people who believe they have a “sinus headache” actually have migraine.

Nausea, sensitivity to light or sound, and recurring throbbing headache are reasons to consider other headache diagnoses as well.

When are antibiotics used for sinusitis?

Most acute sinusitis is viral and does not require antibiotics. The CDC notes that many sinus infections improve without antibiotic treatment.

Even when bacterial sinusitis is suspected, a clinician may recommend watchful waiting for some mild cases. The decision depends on symptom duration, severity, age, and individual risk factors.

Do not use leftover antibiotics or start an antibiotic without medical assessment.

What can help at home?

For mild viral symptoms, measures that can provide relief include:

  • Adequate fluids,
  • Rest,
  • Saline nasal irrigation,
  • Avoiding cigarette smoke,
  • Appropriate pain relief when safe for the individual.

Water used for nasal rinsing should be safe and the equipment kept clean. Decongestant nasal sprays can cause rebound congestion when used for too long, so duration of use matters.

Does allergy affect sinusitis?

Allergic rhinitis can cause swelling of the nasal lining and persistent congestion, which may interfere with sinus drainage in some people.

Sneezing, nasal itching, and clear discharge are often more prominent with allergy. Allergy and sinus disease can also occur together.

What happens during an ENT examination?

An ENT specialist assesses the nasal cavity and throat. When necessary, nasal endoscopy can provide a closer look at the inside of the nose and sinus drainage pathways.

CT imaging may be used in chronic disease or when complications are suspected. Routine imaging is usually unnecessary for an uncomplicated episode of acute sinusitis.

When is sinus surgery considered?

Endoscopic sinus surgery may be considered when chronic rhinosinusitis persists despite appropriate medical treatment, or when nasal polyps or anatomical obstruction are present.

Surgery is not the standard treatment for every sinus infection. The goal is to improve ventilation and drainage and, where necessary, remove diseased tissue.

Which symptoms require urgent assessment?

Serious complications of sinus infection are uncommon but important because the sinuses are close to the eyes and brain.

Seek prompt assessment for:

  • Marked swelling or redness around an eye,
  • Changes in vision or double vision,
  • Very severe headache,
  • Neck stiffness,
  • Altered consciousness,
  • Rapid deterioration with high fever,
  • Severe symptoms in a person with significant immune suppression.

What is investigated when sinusitis keeps recurring?

When someone has many similar episodes in a year or symptoms repeatedly return despite treatment, it may not be enough to treat each episode as a separate infection. ENT assessment can look for underlying factors that affect nasal function and sinus ventilation.

Possible contributors include:

  • Allergic rhinitis,
  • Significant nasal septal deviation,
  • Nasal polyps,
  • Chronic rhinosinusitis,
  • Dental infection involving the maxillary sinus,
  • Smoking or heavy irritant exposure,
  • Rarely, disorders affecting immune function.

One-sided foul-smelling discharge, pressure mainly on one side of the face, or symptoms related to the upper molar teeth can suggest a dental source. Repeated antibiotics alone may not solve the problem if the dental cause is not treated.

Treatment of chronic symptoms also differs from treatment of an acute infection. Saline irrigation, intranasal corticosteroids in appropriate patients, allergy control, and management of polyps may all be considered according to endoscopic and imaging findings.

Conclusion

Sinusitis symptoms overlap easily with colds, allergies, and migraine. The duration and pattern of symptoms are especially important. Most acute cases improve without antibiotics, while prolonged, recurrent, or complicated symptoms such as swelling around the eye warrant ENT assessment.

Frequently asked questions

Is sinusitis contagious?

Sinusitis itself is not always contagious. The viral respiratory infection causing acute symptoms may be contagious.

Can sinusitis get better without antibiotics?

Yes. Most acute cases are viral and improve without antibiotics.

Can sinusitis cause tooth pain?

Inflammation of the maxillary sinuses can cause pressure or pain in the upper teeth. Dental infections can also spread toward the sinus.

Can sinusitis reduce the sense of smell?

Yes. Nasal blockage and mucosal swelling can reduce smell. Persistent smell loss should be assessed.

Is sinus surgery a permanent cure?

Surgery can improve drainage and symptoms in suitable patients, but underlying tendencies such as allergy or chronic inflammation may continue.

Does steam help sinusitis?

Warm humid air may feel soothing for some people, but boiling-water steam can cause serious burns and should be avoided, particularly around children.