Sinusitis: Acute and Chronic Symptoms Explained

Sinusitis is inflammation of the sinus lining that can cause nasal congestion, facial pressure, thick nasal discharge, and changes in smell. Understanding the differences between acute and chronic sinusitis helps patients seek appropriate care and avoid unnecessary treatments.

Overview

Sinusitis, also called rhinosinusitis, is inflammation of the air-filled spaces around the nose and eyes. These spaces, known as the sinuses, normally produce mucus that drains through small openings into the nose. When the sinus lining becomes swollen, mucus may become trapped, leading to congestion, pressure, and discomfort.

Sinusitis is often described as acute or chronic. Acute sinusitis usually develops after a common cold and lasts for a short period, often improving within days to a few weeks. Chronic sinusitis lasts 12 weeks or longer and involves ongoing inflammation, even when infection is not the main cause.

The condition is common and usually manageable. The important point is to recognize the pattern of symptoms, avoid overusing antibiotics, and seek medical advice when symptoms are severe, prolonged, or recurrent.

Acute Sinusitis Symptoms

Acute sinusitis often begins like a viral upper respiratory infection. A person may first notice a runny or blocked nose, sneezing, sore throat, mild fever, and general tiredness. As inflammation increases, pressure may develop around the cheeks, forehead, bridge of the nose, or behind the eyes.

Typical symptoms include thick nasal discharge, nasal blockage, facial pain or pressure, reduced sense of smell, headache, cough, and postnasal drip. The cough may be worse at night because mucus drains down the back of the throat. Some people also describe ear fullness, tooth discomfort in the upper jaw, or bad breath.

Most acute sinusitis is viral and improves without antibiotics. Symptoms that worsen after initial improvement, last more than about 10 days without getting better, or are accompanied by high fever and significant facial pain may suggest possible bacterial sinusitis and should be assessed by a doctor.

Chronic Sinusitis Symptoms

Chronic sinusitis is not simply a long-lasting cold. It is a persistent inflammatory condition of the nose and sinuses that continues for 12 weeks or more. Symptoms may be milder than in acute sinusitis, but they are ongoing and can affect sleep, energy levels, breathing, and quality of life.

The main symptoms are nasal blockage, thick nasal drainage or postnasal drip, facial pressure, and reduced or lost sense of smell. Pain may be less prominent than in acute sinusitis. Some patients mainly experience constant congestion, throat clearing, cough, fatigue, or a feeling of heaviness in the face.

Chronic sinusitis can occur with or without nasal polyps. Nasal polyps are soft, noncancerous swellings in the nasal passages or sinuses that can worsen blockage and smell loss. People with asthma, allergies, aspirin sensitivity, or recurrent infections may be more likely to have chronic or recurrent sinus symptoms.

Causes and Risk Factors

Acute sinusitis most often follows a viral cold. The virus irritates the nasal and sinus lining, causing swelling and increased mucus production. In some cases, blocked drainage allows bacteria to grow, but bacterial sinusitis is much less common than viral sinusitis.

Chronic sinusitis usually has more than one contributing factor. Ongoing inflammation may be related to allergies, asthma, nasal polyps, irritant exposure, immune system problems, or structural issues such as a deviated nasal septum. Dental infections can occasionally contribute to sinus problems, especially in the maxillary sinuses located near the upper teeth.

Common factors that can increase sinusitis risk include:

• Recent viral respiratory infection
• Allergic rhinitis or uncontrolled nasal allergies
• Asthma or other airway inflammatory conditions
• Nasal polyps or narrowed sinus drainage pathways
• Smoking or exposure to secondhand smoke and pollutants
• Frequent air travel, dry air, or occupational irritants
• Dental infection or recent dental procedures involving the upper jaw

Diagnosis

Diagnosis usually begins with a detailed discussion of symptoms, their duration, and whether they are improving or worsening. A doctor may ask about allergies, asthma, previous sinus infections, dental symptoms, smoking exposure, and use of nasal sprays or other medications.

During examination, the clinician may look inside the nose for swelling, discharge, polyps, or signs of allergy. In many straightforward acute cases, no imaging or laboratory testing is needed. The decision to prescribe antibiotics depends on symptom pattern, duration, severity, and clinical judgment.

For chronic, recurrent, or unclear symptoms, an ENT specialist may perform nasal endoscopy. This involves using a thin camera to examine the nasal passages and sinus drainage areas. A CT scan of the sinuses may be recommended when symptoms persist despite treatment, when surgery is being considered, or when complications or alternative diagnoses need to be ruled out.

Treatment Options

Treatment depends on whether sinusitis is acute or chronic and whether infection, allergy, structural blockage, or inflammation is the main driver. Many cases of acute viral sinusitis improve with supportive care such as rest, fluids, saline rinses, humidified air, and appropriate pain relief. Patients should follow the advice of a qualified clinician before using medications, especially if they have chronic illnesses, are pregnant, or take other medicines.

For selected cases of suspected bacterial acute sinusitis, a doctor may prescribe antibiotics. Antibiotics are not useful for viral infections and should not be started or stopped without medical guidance. Nasal corticosteroid sprays may help reduce inflammation, particularly when allergies or chronic sinusitis are present. Antihistamines may be useful for allergic rhinitis but are not needed for every sinus infection.

Chronic sinusitis often requires a longer-term plan. This may include regular saline irrigation, nasal corticosteroid sprays, allergy treatment, management of asthma, and treatment of contributing dental or immune problems. If symptoms continue despite appropriate medical therapy, endoscopic sinus surgery may be considered to improve drainage, remove polyps, or correct obstruction. Surgery is not a cure for inflammation, so follow-up care remains important.

Prevention and Self-care

Not every sinusitis episode can be prevented, but good nasal and respiratory care can reduce irritation and support sinus drainage. Washing hands, avoiding close contact with people who have respiratory infections, and keeping vaccinations up to date according to medical advice may help lower the risk of viral illnesses that trigger acute sinusitis.

Saline nasal sprays or rinses can help clear mucus and allergens. If using a rinse bottle or neti pot, patients should use sterile, distilled, or previously boiled and cooled water, and clean the device as instructed. Maintaining hydration, using a humidifier when air is dry, and avoiding cigarette smoke can also support nasal comfort.

For people with allergies, identifying and managing triggers is important. This may involve reducing dust exposure, controlling mold, keeping pets out of sleeping areas when relevant, and using prescribed allergy medications consistently. Overuse of decongestant nasal sprays can worsen congestion, so these products should only be used for short periods and according to professional advice.

When to See a Doctor

Medical advice is recommended when sinus symptoms are severe, last longer than expected, keep returning, or interfere with daily life. A doctor should also assess symptoms that worsen after initially improving, as this pattern may suggest bacterial infection or another condition requiring treatment.

Urgent medical care is needed for swelling or redness around the eye, vision changes, severe headache, confusion, stiff neck, persistent high fever, or severe facial swelling. These signs are uncommon but require prompt assessment because they may indicate spread of infection or another serious problem.

Patients with chronic congestion, loss of smell, asthma, nasal polyps, or repeated sinus infections may benefit from evaluation by an ENT specialist. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat sinusitis for international patients, including complex or persistent cases, with care plans tailored to each person’s needs.

Frequently asked questions

What is the difference between acute and chronic sinusitis?

Acute sinusitis usually lasts less than 4 weeks and often follows a viral cold. Chronic sinusitis lasts 12 weeks or longer and involves persistent inflammation of the nose and sinuses. Chronic symptoms may be less intense but tend to be ongoing or frequently recurring.

Does green or yellow mucus always mean a bacterial sinus infection?

No. Mucus color can change during viral infections and does not automatically mean antibiotics are needed. Doctors consider the duration, severity, symptom pattern, fever, facial pain, and whether symptoms worsen after initial improvement.

Can sinusitis cause tooth pain?

Yes, sinus inflammation can cause pressure or aching in the upper teeth because the maxillary sinuses are close to the upper jaw. However, dental infection can also mimic or contribute to sinus symptoms. Persistent tooth pain should be assessed by a dentist or doctor.

Are antibiotics always needed for sinusitis?

Antibiotics are not needed for most viral sinus infections. They may be prescribed when bacterial sinusitis is suspected based on clinical features. Patients should not take leftover antibiotics or request them routinely, as unnecessary use can cause side effects and antibiotic resistance.

Can allergies cause chronic sinusitis?

Allergies can contribute to nasal swelling, mucus production, and blocked sinus drainage. In some people, poorly controlled allergic rhinitis makes sinus symptoms more frequent or persistent. Allergy management may be an important part of treatment.

When is sinus surgery considered?

Endoscopic sinus surgery may be considered when chronic sinusitis, nasal polyps, or structural blockage does not improve with appropriate medical treatment. The goal is to improve sinus drainage and access for ongoing nasal therapies. A specialist evaluation and imaging are usually needed before surgery is recommended.

References

• World Health Organization
• Centers for Disease Control and Prevention
• American Academy of Otolaryngology–Head and Neck Surgery
• European Position Paper on Rhinosinusitis and Nasal Polyps
• Mayo Clinic

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.