Can You Get an MRI If You Have a Cold?

A common cold does not prevent you from getting an MRI. The scanner itself poses no special danger to someone with a stuffy nose, sore throat, or mild cough. The main concerns are practical rather than safety-related: cold symptoms can make it harder to lie still, hold your breath on command, or tolerate 30 to 60 minutes inside a narrow tube. Whether your appointment should go ahead or be rescheduled depends less on the cold itself and more on the type of scan, whether sedation is involved, and how miserable you actually feel.

When a Cold Might Get Your MRI Postponed

The single biggest reason a cold leads to a cancelled MRI is when the scan requires sedation or general anesthesia. This comes up most often in young children, who usually cannot stay still long enough for a standard scan without being sedated. Upper respiratory infections increase the risk of airway complications under anesthesia, including laryngospasm and oxygen desaturation, so anesthesiologists routinely screen for cold symptoms and may call off the procedure. A study of pediatric MRI cancellations found that about 4.5% of outpatient anesthesia-supported scans were cancelled on the day of the appointment, with roughly three-quarters of those cancellations tied to patient and family factors, including acute illness.¹

For adults who do not need sedation, cancellation is much less likely. Most imaging centers will let you proceed unless your symptoms are severe enough that you cannot lie flat comfortably, cannot stop coughing, or have a significant fever. If you are unsure, call ahead. The technologist and radiologist can advise whether your specific scan type is forgiving enough to tolerate some restlessness or whether pristine stillness is essential.

How Cold Symptoms Interfere With Image Quality

MRI works by collecting data over time while you stay motionless. Even small movements can blur the resulting images. Cold symptoms create several distinct problems.

Coughing is the most disruptive. A single forceful cough shifts your entire torso and head, and the scanner cannot easily correct for that kind of sudden, large-scale motion. Brain scans are particularly sensitive to any head movement. Motion-compensated pulse sequences exist that can salvage usable images despite some patient movement, and research on awake pediatric brain MRI has shown these techniques can produce high-quality images even when patients move substantially.² But those specialized sequences are not available everywhere and are not standard protocol for most adult scans. If you are coughing frequently, the technologist may need to repeat certain sequences, which extends your time in the scanner.

Breath-hold sequences present another challenge. Scans of the liver, pancreas, and upper abdomen often require you to hold your breath for 18 to 22 seconds at a time to freeze organ motion.³ When you are congested and breathing through your mouth, sustaining that kind of hold becomes significantly harder. Newer free-breathing techniques are emerging that can partially compensate, but conventional abdominal MRI protocols still rely heavily on breath-holds. If your scan involves abdominal imaging and you are struggling to breathe comfortably, rescheduling may actually produce a better diagnostic result than pushing through.

Nasal congestion itself, while not directly causing motion artifacts, adds to general discomfort. Lying flat for an extended period tends to worsen stuffiness because gravity no longer helps drain the sinuses. Combined with the enclosed space of the MRI bore, this can make the experience feel claustrophobic even for people who would not normally struggle with it.

What a Cold Actually Looks Like on MRI

If your MRI scan captures the sinuses, your cold may show up in the images. A well-known study experimentally infected healthy young adults with rhinovirus and then tracked their sinuses with serial MRI scans. About a third of the infected subjects who had usable follow-up scans developed visible abnormalities in the ethmoid or maxillary sinuses, including mucosal thickening and fluid accumulation, during the acute phase of the infection.⁴ The people who developed these changes also produced substantially more nasal secretions.

This matters because sinus abnormalities on MRI are not always meaningful. Even among the healthy, asymptomatic volunteers in that same study, about 18% already had some mucosal thickening or fluid visible on their baseline scans before they were ever infected. So if your radiologist sees something in your sinuses while you happen to have a cold, it does not automatically mean you have sinusitis that needs treatment. It may simply be a normal inflammatory response to the viral infection that will resolve on its own. A good radiologist will note the finding and factor in your clinical context, but it is worth knowing that a cold can produce “incidental findings” that look more alarming on paper than they are in reality.

Fever and RF Heating Inside the Scanner

MRI scanners deposit radiofrequency energy into your body during a scan, and that energy generates a small amount of heat. In a healthy person, this is a non-issue because your body’s thermoregulatory system handles the extra warmth easily. But fever changes the equation slightly. When you already have an elevated core temperature, your thermoregulatory system is working harder, and the additional heat load from the scanner is theoretically more of a concern.

A review of MRI safety considerations flagged fever as one of several conditions that could impair a patient’s ability to manage the thermal effects of RF energy during a scan.⁵ The risk here is more of a theoretical safety margin than a documented crisis: healthy adults with a mild cold-related fever are extremely unlikely to experience any harm from the RF heating of a standard scan. The concern becomes more real for patients who are critically ill, sedated, heavily insulated, or unable to communicate that they feel overheated. For a typical outpatient with a cold and a low-grade fever, the thermal risk is negligible, but it is the reason the intake questionnaire asks about fever and why a high temperature might prompt a technologist to pause.

Spreading Your Cold in the MRI Suite

One concern that patients often overlook is infection control. You will be spending time in a waiting room, changing area, and the scanner room itself, and you will be lying on a surface that other patients use throughout the day. MRI suites follow standard infection-prevention protocols, including regular disinfection of all surfaces patients come into contact with.⁶ But you also bear some responsibility: if you are actively sneezing and coughing, wearing a mask, practicing hand hygiene, and covering coughs protects the staff and the next patient.

During periods of heightened respiratory illness in the community, some imaging centers may ask patients with acute symptoms to reschedule non-urgent scans simply to reduce transmission risk in the facility. This is not because the MRI is unsafe for you; it is a public health consideration. If your scan is genuinely urgent, the center will almost certainly proceed with appropriate precautions rather than delay it.

Using a Decongestant Before Your Scan

If your scan cannot be rescheduled and you are dealing with significant congestion, taking a decongestant beforehand can make the experience more tolerable. Research using MRI to measure nasal airway dimensions found that oral decongestants and external nasal strips each enlarged the airway, and the two together had an additive effect, with the decongestant working primarily on the deeper posterior nasal passages and the nasal strip opening the front of the nose.⁷ In practical terms, taking a standard dose of pseudoephedrine or using an oxymetazoline nasal spray about 30 minutes before your appointment can meaningfully reduce the feeling of being unable to breathe while lying flat.

A few caveats apply. Check with your doctor if you have high blood pressure, since oral decongestants can raise it. Do not use a nasal spray decongestant if your scan is specifically looking at the nasal passages or sinuses, because the drug will change the anatomy the radiologist is trying to evaluate. And if you are scheduled for contrast dye injection, mention any medications you have taken to the technologist, not because decongestants interact with gadolinium-based contrast agents, but because full disclosure is always good practice.

Practical Tips for Getting Through the Scan

If you and your care team decide to go ahead with the MRI despite your cold, a few strategies can help the scan go smoothly.

• Time your medications: Take any cough suppressant or decongestant early enough that it reaches peak effectiveness by the time you are on the table, typically 30 to 60 minutes before the appointment.
• Bring tissues: You will need to leave them outside the scanner room (paper products are fine near the magnet, but you cannot reach them once you are in the bore), so blow your nose thoroughly right before you lie down.
• Ask about positioning: A slight head elevation can reduce the sensation of postnasal drip. Some scanners allow a small foam wedge under the head, which helps without introducing enough tilt to compromise image geometry.
• Use the squeeze bulb: Every MRI suite gives you an alarm you can squeeze if you need to stop the scan. If a coughing fit starts, squeeze it. Pausing for 30 seconds and restarting a sequence is far better than coughing through it and producing unusable images that have to be repeated anyway.
• Breathe through your mouth: If nasal breathing is not happening, mouth breathing is fine. For breath-hold sequences, the technologist will coach you through the timing. Let them know before the scan that you may need a few extra seconds between holds.

Abdominal and Chest Scans Versus Head and Extremity Scans

Not all MRI exams are equally affected by cold symptoms. A scan of your knee, shoulder, or wrist is largely immune to the problems a cold creates. These exams do not involve breath-holds, the body part being imaged is far from the sinuses and chest, and mild coughing during a knee scan is unlikely to degrade the images unless it moves the joint itself. You can usually proceed with these exams even if you feel quite unwell, as long as you can tolerate lying still for the duration.

Brain and spine scans fall in the middle. They do not require breath-holds, but they are sensitive to head motion, so frequent coughing or sneezing can be problematic. Abdominal and cardiac scans are the most affected, because they rely on breath-holds and are sensitive to the motion of your diaphragm and chest wall. If you need a liver MRI and you are in the acute phase of a cold with a productive cough, the diagnostic yield of the scan may be genuinely compromised, and waiting a week could save everyone time.

Chest MRI is relatively uncommon compared to chest CT, but when it is ordered, the same breath-hold challenges apply. Lung MRI is already technically demanding because the lungs are full of air, which produces very little MRI signal. Adding mucus, congestion, and impaired breath-holding to that mix makes an already difficult exam even harder.

Children, Sedation, and the Two-Week Rule

Pediatric MRI deserves special attention because young children almost always require sedation, and the interaction between a cold and anesthesia is the one scenario where postponement is genuinely the safer choice. Most anesthesia guidelines recommend waiting at least two weeks after the resolution of upper respiratory symptoms before proceeding with elective sedation. The concern is not the MRI itself but the airway management under anesthesia: inflamed airways are more reactive, and the risk of bronchospasm and laryngospasm rises.

This creates a frustrating cycle for parents, especially during winter months when children seem to catch one cold after another. A scan scheduled in January may get pushed to February, then to March, with each new sniffle resetting the clock. If the MRI is urgent, the anesthesia team will weigh the risks and benefits and may proceed with extra precautions like having a pediatric anesthesiologist rather than a nurse anesthetist manage the airway. For non-urgent scans, the delay is almost always the right call, even though it is inconvenient.

Some pediatric centers have invested in motion-compensated MRI techniques and child-friendly scanner environments that allow older children to complete scans awake, avoiding the sedation question entirely.² If your child’s scan keeps getting cancelled due to colds, it may be worth asking whether an awake protocol is available at a nearby center.

When MRI Is the Reason You Discover the Cold Is Something More

Occasionally, what a patient thinks is a lingering cold turns out to be something else, and the MRI is what reveals it. Persistent sinus congestion can indicate chronic sinusitis, nasal polyps, or structural abnormalities that look dramatically different on MRI from the transient mucosal swelling of an acute viral cold. If you go in for a brain MRI and the images happen to catch your sinuses, the radiologist may flag findings that lead to a referral to an ENT specialist. This is not the purpose of the scan, but it is a real and sometimes helpful byproduct.

More rarely, viral respiratory infections can trigger post-infectious neurological complications. A case report described a patient with COVID-19 who developed a serious brain condition called acute disseminated encephalomyelitis, which was diagnosed on brain MRI showing widespread lesions.⁸ This kind of scenario is extreme and not typical of a common cold, but it illustrates why doctors sometimes order brain MRIs in the setting of a respiratory infection when neurological symptoms emerge. In that context, the cold is not a reason to delay the MRI. It is the reason the MRI was ordered in the first place.