Acute Sinusitis: Symptoms, Causes and Treatments

Written by Medicover Team and Medically Reviewed by Dr Neha A Padia , ENT

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Acute sinusitis, also known as acute rhinosinusitis, is the inflammation of the sinuses and nasal passages lasting less than four weeks. It usually develops due to viral infections, but may also occur due to bacterial infections, allergies, or exposure to environmental irritants. The condition causes swelling of the sinus lining, which blocks normal drainage and leads to mucus build-up.

What Are the Types of Acute Sinusitis?

Sinusitis can be classified based on duration and pattern of occurrence. Understanding these types helps in determining the appropriate treatment approach.

Acute sinusitis: Symptoms last less than four weeks and usually develop after a cold or viral infection.
Subacute sinusitis: Symptoms may persist for 4 to 12 weeks.
Recurrent acute sinusitis: Several episodes of acute sinusitis occur within a year, with complete recovery between episodes.
Chronic sinusitis: Symptoms persist for more than twelve weeks despite treatment.

What Are the Symptoms of Acute Sinusitis?

The symptoms of acute sinusitis can affect daily comfort and breathing. They usually develop quickly and may vary depending on the severity of inflammation or infection.

Nasal congestion: Blocked nasal passages caused by inflammation and mucus accumulation.
Facial pain and pressure: Pain or heaviness around the cheeks, forehead, or eyes.
Runny nose: Nasal discharge that may appear yellow or green.
Reduced sense of smell: Difficulty detecting or identifying scents.
Cough: Often worsens at night due to postnasal drip.
Headache: Caused by pressure within the sinus cavities.
Fever: Elevated body temperature, more common with bacterial infection.
Fatigue: General tiredness or feeling unwell.

What Causes Acute Sinusitis?

Acute sinusitis develops when the sinus passages become inflamed or blocked, preventing normal mucus drainage. Several factors may trigger this inflammation.

Viral infections: The common cold is the most frequent cause, leading to swelling of the sinus membranes.
Bacterial infections: Secondary bacterial infection may occur when sinus drainage remains blocked.
Allergies: Allergic reactions can inflame the nasal tissues and sinuses.
Environmental irritants: Exposure to pollutants, smoke, and other irritants may cause sinus inflammation.

When Should You See a Doctor for Acute Sinusitis?

Many cases improve with self-care and medications. However, medical evaluation is important if symptoms become severe or persist.

Symptoms lasting more than 10 days without improvement.
High fever or severe facial pain.
Swelling around the eyes or changes in vision.
Repeated episodes of sinus infection.
Symptoms that worsen after initially improving.

An ear, nose, and throat specialist usually evaluates persistent or complicated sinus conditions.

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How is Acute Sinusitis Diagnosed?

Diagnosis usually begins with a clinical evaluation based on medical history and physical examination. ENT Doctors may also recommend additional tests to confirm sinus inflammation or infection.

Nasal endoscopy: A thin tube with a light and a camera is inserted into the nasal passages to examine the sinuses.
Imaging tests: CT scans or MRI may be used to detect sinus blockage, swelling, or structural abnormalities.
Nasal or sinus cultures: Samples of nasal discharge may be tested to identify bacterial infection and guide treatment.

What are the Treatment Options for Acute Sinusitis?

Treatment focuses on relieving symptoms, reducing inflammation, and treating the underlying infection when present.

Decongestants: Help reduce nasal congestion and improve sinus drainage.
Nasal corticosteroid sprays: Reduce swelling and inflammation inside the nasal passages.
Antibiotics: Prescribed when bacterial infection is suspected, usually after symptoms persist for more than ten days.
Pain relievers: Medicines such as ibuprofen or acetaminophen help relieve facial pain, headache, and fever.

Some supportive home measures may also help improve comfort and recovery.

Steam inhalation: Helps open nasal passages and loosen mucus.
Warm compresses: Applying warmth to the face may relieve sinus pressure.
Hydration: Drinking fluids helps thin mucus and improve drainage.
Saline nasal sprays or rinses: Help keep nasal passages moist and reduce congestion.
Rest: Adequate rest supports the body's recovery from infection.

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What is the Recovery Process for Acute Sinusitis?

Most cases of acute sinusitis improve within one to two weeks with proper treatment and supportive care. Recovery depends on the underlying cause and the individual's overall health.