sinus infection on one side

Overview

A sinus infection on one side means the lining of the sinus cavities on just one side of your face is swollen and inflamed, usually due to a virus, bacteria, or other cause. It can cause pain, pressure, and stuffiness on that side.

Yes, sinus infections are common, but having symptoms only on one side is less typical and may need a check-up to find the cause.

It can affect children and adults. People with allergies, asthma, a weakened immune system, or structural differences in the nose are more likely.

Symptoms

Common symptoms

• Pain, pressure, or fullness on one side of the face or in one cheek, eye, or forehead
• Blocked or stuffy nose on the same side
• Thick nasal discharge that may be yellow or green
• Reduced sense of smell or taste
• Headache centered on one side
• Fever or tiredness

Symptoms in children

• Irritability, fussiness, and crying more than usual
• Nasal congestion with snoring or mouth breathing
• Ear pain or popping on the affected side
• Fever or cough that lasts more than 10 days
• Puffiness around the eye on that side

Symptoms in older adults

• Less specific symptoms like confusion, tiredness, or poor appetite
• Fever and cough may be absent
• New or worsening pain on one side of the face
• Bad breath or reduced sense of smell

Causes

Main causes

• Viral infection (like after a cold)
• Bacterial infection that develops after a viral infection
• Allergies or nasal polyps (soft growths inside the nose)
• Dental infection in the upper jaw tooth
• Structural issues in the nose (like a deviated septum)

Risk factors

• Having a recent cold or respiratory infection
• Having allergies or asthma
• Smoking or breathing in secondhand smoke
• Having a weakened immune system
• Swimming or diving frequently
• Using nasal decongestant sprays for more than a few days

When to see a doctor

See a doctor urgently if:

• You have signs of complications (see emergency section)
• Pain or swelling around the eye
• Symptoms get worse after initial improvement
• Symptoms last more than 10-14 days without improving

Book a routine appointment if:

• You suspect a dental cause
• You have recurrent sinus infections
• You have a weakened immune system
• You want help with symptom management

Diagnosis

Your doctor will ask about your symptoms and examine your face, nose, and throat. Often the diagnosis is clinical, meaning no tests are needed.

Tests that may be done

• Nasal endoscopy (looking inside the nose with a thin, flexible scope)
• Imaging such as a CT scan (rarely needed at first, but helpful for recurring or complicated cases)
• Sinus culture or dental exam if a dental cause is suspected

What to expect at your appointment

Your doctor may press gently on the affected sinus area and shine a light to see blockages. They may also check your teeth and refer you to an ENT specialist (ear, nose, and throat doctor) or dentist if needed.

Treatment

Treatment focuses on relieving symptoms, encouraging drainage, and addressing any underlying cause. Most one-sided sinus infections are caused by viruses, so antibiotics are not the first step. Your doctor or pharmacist can advise about safe options for symptom relief — always ask before taking anything.

Self-care at home

• Drink plenty of water to keep mucus thin
• Use a warm compress on the painful side of your face
• Breathe in steam from a warm shower or a bowl of hot water (with care)
• Get plenty of rest
• Avoid smoke and strong fumes
• Try a saline (saltwater) nasal rinse to clear blocked passages

Medical treatments

Doctors may recommend pain relievers, fever reducers, or decongestants taken by mouth or as a nasal spray. These are general classes of medicines — ask your pharmacist or doctor which option is appropriate for you. If a bacterial infection is confirmed or strongly suspected, a short course of antibiotics may be prescribed. Taking antibiotics exactly as directed is important.

When is surgery considered?

Surgery is rarely needed, but may be considered if there is a blocked drainage pathway, a stubborn nasal polyp, or a dental infection spreading to the sinus. Your specialist will discuss the options and timing.

Living with this condition

Managing a one-sided sinus infection can take time. Keep up your daily routine as much as possible, but allow yourself extra rest. Apply warmth and stay hydrated; over several days your symptoms should gradually ease.

Lifestyle tips

• Quit smoking and avoid secondhand smoke
• Use a humidifier or vaporizer at home
• Wash your hands often to avoid spreading germs
• Elevate your head slightly while sleeping to help sinuses drain

Diet and exercise

Eat a balanced diet with fruits and vegetables to support your immune system. Light activity such as walking may be beneficial once you feel up to it, but avoid heavy exercise if you have a fever or feel very unwell.

Mental health and emotional wellbeing

Feeling pain and pressure for days can be exhausting and stressful. It is normal to feel low or anxious while you recover. Remember that most sinus infections improve in 1 to 2 weeks and many people are back to normal before then.

Prevention

You cannot always prevent a sinus infection, but you can lower your risk by managing allergies, avoiding colds with good hand hygiene, staying away from cigarette smoke, and treating dental problems early.

Vaccines

Staying up to date with recommended vaccines, such as the seasonal flu vaccine, can reduce the chance of respiratory infections that can lead to sinusitis.

Complications

If left untreated

• Infection may spread to tissue around the eye or into the bone, causing swelling or pain
• A dental abscess could develop or worsen
• In rare cases, infection can spread to the brain or surrounding tissues (an emergency)
• Chronic or recurrent sinusitis may develop

Long-term outlook

With proper home care and, if needed, medical treatment, most one-sided sinus infections clear up completely without lasting problems. A full recovery is the typical outcome, and your pain and pressure should settle as the inflammation goes down. If you have repeated episodes, working with a doctor to find the cause offers the best chance of long-term relief.

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