sinus infection MRI what to expect

Overview

Sinusitis, or a sinus infection, happens when the tissues lining your sinuses (the air-filled spaces in your face) become inflamed and swollen. This often causes symptoms like congestion, facial pain, and a runny nose. An MRI (magnetic resonance imaging) scan uses powerful magnets and radio waves to create detailed pictures of the soft tissues inside your body. When doctors need a closer look at your sinuses, they may order an MRI — especially if they want to see how far an infection has spread or check the soft tissue areas around the sinuses.

Sinus infections are very common, but having an MRI for one is not. Most sinus infections clear up on their own or with basic care. MRI is only used when doctors suspect complications or need to rule out other conditions.

Sinus infections can affect people of all ages. An MRI might be considered for someone whose sinus symptoms are severe, keep coming back, or who has signs of infection spreading to the eyes or brain — though this is rare. It is sometimes used for people with unusual anatomy or after other tests have not given a clear answer.

Symptoms

Common symptoms

• Runny nose or nasal congestion
• Facial pressure, pain, or fullness
• Headache or tooth pain
• Reduced sense of smell
• Cough, often worse at night
• Fatigue or feeling unwell
• Fever
• Bad breath or thick colored mucus

Symptoms in children

• Cold-like symptoms that last more than 10 days
• Irritability or fussiness
• Difficulty sleeping or snoring
• Swelling around the eyes
• Cough, congestion, or thick nasal discharge
• Fever that is present

Symptoms in older adults

• Less specific symptoms like confusion or decreased appetite
• Fatigue and weakness
• Long-lasting congestion or discharge
• Facial pain (may be less obvious)
• Falls or worsening of other chronic conditions

Causes

Main causes

• Viral infections (most common, often from a cold)
• Bacterial infections (when viruses or other factors allow bacteria to grow)
• Allergic reactions to substances like pollen or dust
• Nasal polyps or a deviated septum that block sinus drainage
• Swelling from dental infection or recent dental work

Risk factors

• Recent upper respiratory infection or cold
• Allergies, asthma, or a weakened immune system
• Smoking or exposure to secondhand smoke
• Nasal structural issues, like a deviated septum or nasal polyps
• Air travel, flying, or changes in air pressure

When to see a doctor

See a doctor urgently if:

• If you have symptoms that suggest infection may be spreading, such as eye swelling, severe headache, or confusion, seek care immediately.
• See a doctor right away if you have a high fever with severe facial pain and are unable to get pain relief.

Book a routine appointment if:

• Make an appointment if your sinus symptoms last more than 10 days, if you have multiple sinus infections in a short period, or if over-the-counter measures are not helping.
• Also talk to your doctor if you have a chronic condition like asthma or diabetes and you develop sinus symptoms.

Diagnosis

A doctor usually starts by asking about your symptoms and looking inside your nose with a small, lighted scope called an endoscope. They may tap over your sinuses to see if they feel tender. If the diagnosis is unclear or symptoms point to possible complications, they may recommend imaging tests. A CT scan is the most common imaging test for the sinuses. An MRI is used less often, but it can provide even better detail of soft tissues, so it may be chosen to check for infection spreading into the eye socket, brain, or other nearby areas.

Tests that may be done

• Physical exam and medical history
• Nasal endoscopy — a thin, flexible tube with a camera to view the sinuses
• CT scan — a fast, painless scan that shows bone and air spaces
• MRI — gives detailed images of soft tissues, often with contrast dye
• A sample of mucus to check for bacteria or other infections (less common)

What to expect at your appointment

If your doctor orders an MRI for your sinuses, you will be asked to lie on a narrow table that slides into a large, ring-shaped machine. A special coil (a device that helps capture the images) will be placed around your head. The machine will make loud knocking and buzzing noises, so you will be given earplugs or headphones. The scan typically takes about 30–60 minutes. You need to stay very still. In some cases, a contrast dye is given through a small IV line in your arm to help highlight certain structures. You will be able to talk to the technician via a speaker, and you can let them know if you feel uncomfortable. After the scan, you can usually go home and resume normal activities.

Treatment

Treatment for a sinus infection depends on the cause. Most sinus infections are viral, so antibiotics are not needed. The goal is to relieve symptoms and help your sinuses drain. If your doctor suspects a bacterial infection or a complication, they may recommend additional steps, which could include imaging like an MRI to get a clearer picture.

Self-care at home

• Rest and drink plenty of fluids, like water or warm tea.
• Use a saline nasal spray or rinse to keep your nasal passages moist.
• Place a warm washcloth over your forehead and cheeks to ease facial pain.
• Inhale steam from a bowl of hot water (carefully) or take a warm shower.
• Use a humidifier in your bedroom to add moisture to the air.
• Avoid triggers like smoke, strong fumes, and known allergens.

Medical treatments

Doctors may recommend over-the-counter pain relievers or decongestants to help with discomfort and congestion. They might also suggest prescription nasal sprays (such as a corticosteroid spray) to reduce swelling. If a bacterial infection is confirmed or strongly suspected, they will prescribe an antibiotic. Keep in mind that antibiotics do not work for viral infections, which are far more common.

When is surgery considered?

Surgery is rarely the first treatment. It might be considered if you have nasal polyps, a deviated septum, or another structural problem that keeps sinuses from draining, or if you continue to get severe infections despite proper medical treatment. Your doctor would explain the specific surgery options if they think it could help.

Living with this condition

Most sinus infections are short-lived. While you recover, take it easy, rest, and use the self-care steps listed above. If you have long-term (chronic) sinusitis, work with your doctor to create a daily routine that keeps symptoms in check and helps you feel your best.

Lifestyle tips

• Avoid smoking and secondhand smoke, which can irritate your sinuses.
• Wash your hands frequently to reduce your risk of catching colds and viruses.
• Use a humidifier in dry indoor air, especially during winter.
• Manage allergies with the help of your doctor.

Diet and exercise

Drinking plenty of water and eating balanced meals supports your immune system. Gentle exercise, like walking, can help you feel better as long as you are not running a high fever or feeling too unwell. If you feel dizzy or short of breath, stop and rest.

Mental health and emotional wellbeing

Dealing with ongoing sinus pain and congestion can be frustrating and tiring. It can interfere with sleep, work, and daily activities, which may affect your mood. It is normal to feel a little down at times. Talk to your doctor if you feel anxious, depressed, or hopeless. If you ever have thoughts of harming yourself, please contact a crisis support line right away.

Prevention

You can lower your risk of sinus infections by taking care of your immune system and limiting exposure to infections. Good hand hygiene, avoiding close contact with people who have colds, and keeping your allergies managed all help.

Vaccines

Staying up to date on recommended respiratory vaccines, such as the flu vaccine, can help reduce the chance of developing a viral infection that may lead to sinusitis. There is no specific vaccine for sinus infections.

Screening programmes

There is no routine screening test for sinus infections. They are diagnosed based on symptoms and physical examination.

Complications

If left untreated

• Rarely, a sinus infection can spread to nearby areas. This may lead to an infection around the eye (orbital cellulitis), which can cause vision problems.
• It can also spread to the bones of the face (osteomyelitis) or, in very rare cases, to the lining of the brain (meningitis), which is a medical emergency.
• Chronic sinusitis can lead to nasal polyps or permanent changes to the sinus lining, making it harder to drain.

Long-term outlook

The outlook for sinus infections is very good. Most people recover completely within a few weeks, even without antibiotics. If your doctor orders an MRI, it is usually a precaution to make sure nothing more serious is going on. Finding the right diagnosis is the first step to feeling better.

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