sinus on one side

Overview

Your sinuses are small, air-filled spaces behind your forehead, cheeks, and eyes. When the lining of these spaces becomes swollen or blocked, it can cause pressure, pain, and a stuffy nose. Sometimes this happens on just one side of your face. This is known as one-sided sinus trouble. It can be caused by a cold, allergies, or other issues affecting the drainage of one side.

Yes. Sinus problems are very common. Having symptoms on one side happens often, especially during a cold or allergy flare. Many people experience it at some point.

It can affect people of any age, but it is more likely in those with nasal allergies, nasal polyps (small growths in the nose), a curved nasal septum (the wall inside the nose), or a tooth infection in the upper jaw.

Symptoms

Common symptoms

• Pain, pressure, or fullness on one side of your face, especially around the cheek, eye, or forehead
• A blocked or stuffy nose on one side
• Thick yellow or green nasal discharge from one nostril
• Reduced sense of smell or taste on that side
• A dull headache that gets worse when you lean forward
• A feeling of mucus dripping down the back of your throat
• Mild fever or tiredness

Symptoms in children

• Fussiness or irritability
• Touching or rubbing one side of the face or nose
• A cold that seems worse than usual or lingers
• Coughing, especially at night
• Breathing through the mouth because one side of the nose is blocked

Symptoms in older adults

• Less typical symptoms, sometimes only mild pressure or a vague feeling of being unwell
• Confusion or unusual drowsiness in some cases
• A dry cough or persistent nasal discharge
• Worsening of balance or dizziness if pressure builds up
• Symptoms may be mistaken for normal signs of aging, so medical review is important

Causes

Main causes

• Viral infection, such as a common cold, that inflames the sinus lining
• Bacterial infection that develops after a viral cold or other blockage
• Allergies that make the inside of the nose swell on one side
• Nasal polyps (soft, non-cancerous growths) that block one sinus opening
• A deviated septum (the wall inside the nose curved to one side), making one sinus drain poorly
• A dental infection in an upper tooth spreading into a nearby sinus

Risk factors

• Recurrent colds or flu
• Allergic rhinitis (hay fever or indoor allergies)
• Smoking or exposure to secondhand smoke
• Asthma or other chronic respiratory conditions
• Weakened immune system
• Recent dental work or toothache
• Structural issues in the nose or sinuses

When to see a doctor

See a doctor urgently if:

• Symptoms lasting more than 10 days without improving
• Severe pain that keeps you from daily activities or sleep
• High fever with face pain or swelling
• Swelling or redness around your eye or changes in vision
• Symptoms that improve and then suddenly get worse

Book a routine appointment if:

• Frequent or repeated sinus infections that interfere with your life
• Ongoing stuffiness or pressure on one side for weeks
• A reduced sense of smell that does not return
• Symptoms linked to allergies that do not respond to over-the-counter allergy relief
• Concern about a possible dental cause

Diagnosis

A healthcare provider will ask about your symptoms and examine your face, nose, and mouth. They may press gently on your sinuses to check tenderness. Using a small light and a scope, they can look inside your nose. Based on the findings, they may suggest some tests or simply advise home care.

Tests that may be done

• Nasal endoscopy – a thin, flexible tube with a camera inserted into your nose to see the sinus openings
• Imaging tests, such as a CT scan, if symptoms are persistent or complicated
• A swab of nasal mucus to check for bacteria if an infection is suspected
• Allergy tests if allergies might be the cause
• A dental examination if a tooth infection is suspected

What to expect at your appointment

You will be asked about how long you have had symptoms, whether they affect one or both sides, and what makes them worse. The doctor may recommend a period of home care first, or start treatment if an infection or other cause is likely. You should not feel rushed. If the problem does not improve, further evaluation can help find the cause.

Treatment

Treatment depends on the underlying cause and how long your symptoms have lasted. For a viral infection or mild inflammation, the main approach is to help your sinuses drain and ease discomfort. If bacteria are the cause, a doctor may prescribe antibiotics. Structural problems like polyps or a deviated septum may need more specific care.

Self-care at home

• Rest and drink plenty of fluids to thin mucus
• Apply a warm, damp cloth to your face over the painful area for a few minutes at a time
• Use a saline (salt water) nasal spray or rinse to keep your nasal passages moist and clear
• Breathe steam from a warm shower or a bowl of hot water (carefully) to help open the nasal passages
• Stay upright and elevate your head while lying down to encourage drainage
• Avoid blowing your nose too hard, which can push pressure into the sinuses

Medical treatments

Your healthcare provider may recommend products to reduce swelling in the nose, relieve pain, or manage allergies. These can include decongestants, steroid nasal sprays, or allergy medicines. Always follow the instructions given by your doctor or pharmacist. If a bacterial infection is confirmed, your doctor may prescribe an antibiotic to be taken for the full course, even if you start feeling better.

When is surgery considered?

Surgery is not usually needed. It may be considered if the problem is due to a structural blockage, such as a large nasal polyp or a badly deviated septum, that does not improve with medicine. A dental source of infection may also require a dental procedure.

Living with this condition

Most people manage one-sided sinus problems comfortably at home. Keep a routine of gentle cleaning of your nose with saline, stay hydrated, and rest when you feel unwell. If you know your triggers, like pollen or dust, try to reduce your exposure.

Lifestyle tips

• Use a humidifier at home if the air is dry
• Avoid smoking and secondhand smoke
• Wash your hands regularly to lower your chance of picking up cold viruses
• Consider a nasal rinse or spray at times when you feel congested
• Avoid alcohol if it worsens your symptoms, as it can increase swelling of the nasal lining

Diet and exercise

Eating a balanced diet with plenty of fruits and vegetables helps support your immune system. Drinking enough water keeps mucus thinner and easier to drain. Light exercise, such as walking, can help you feel better, but avoid vigorous activity if you have a fever or feel very unwell.

Mental health and emotional wellbeing

Having persistent sinus pain can be tiring and frustrating. It can affect sleep, concentration, and mood. It is important to be kind to yourself and seek medical advice if symptoms are affecting your quality of life. There is no need to suffer silently.

Prevention

It is not always possible to prevent sinus problems, especially if they are due to structural issues or allergies. However, you can reduce the chance of viral infections and irritation by washing your hands, staying away from smoke, and managing allergies with the help of a doctor.

Vaccines

Staying up to date with recommended vaccines, such as the flu vaccine, can help prevent respiratory infections that sometimes lead to sinus problems. Ask your local health service about what vaccines are recommended for you.

Screening programmes

There is no routine screening for sinus problems. But if you have frequent or severe symptoms, your doctor can explore underlying causes and help you manage them before they become worse.

Complications

If left untreated

• Chronic sinusitis – infection or inflammation lasting more than 12 weeks
• Spread of infection to nearby areas, such as the eye or the bone around the sinuses
• Formation of a pus-filled pocket called an abscess
• In rare cases, infection can spread to the brain or spinal fluid, which is an emergency

Long-term outlook

With the right care, most people recover fully from one-sided sinus problems. Even if the cause is something like a polyp or a deviated septum, there are effective treatments. It is important to see a doctor when symptoms are severe or lasting, but the outlook is generally good.

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