Getting an MRI can feel intimidating, but it is not dangerous or painful. The experience is more boring and loud than anything else. Most people who are nervous beforehand say the scan was easier than they expected. That said, the tight space, loud noises, and need to stay still for up to an hour are real challenges, and roughly 10% of patients experience some degree of claustrophobic feelings during the process. Knowing exactly what happens inside the machine makes a significant difference in how comfortable you’ll feel.
What Actually Happens During the Scan
You lie down on a padded table that slides into a large tube. The tube is open at both ends, so air flows through freely. For most scans, you go in head first, though some lower-body scans position you feet first, which leaves your head and upper body outside the tunnel entirely. Once you’re in position, the technologist leaves the room but talks to you through a speaker the entire time. You’ll also have a call button you can squeeze at any moment to pause the scan.
The machine works by using powerful magnets and radio waves to create detailed images of your body. You won’t feel any of that happening. What you will notice is noise, a lot of it. MRI machines produce loud knocking, buzzing, and humming sounds that change rhythm depending on which images are being captured. The volume is high enough that every patient receives earplugs, and many facilities also provide noise-canceling headphones on top of those, aiming for at least 30 decibels of sound reduction. Some centers play music or let you listen to a podcast through the headphones.
Brain and spine scans typically last around 45 minutes. Body scans (abdomen, pelvis, chest) can take 45 to 60 minutes. If your scan requires contrast dye, add about 15 minutes. The contrast is injected through a small IV line partway through the scan. Some people feel a brief sensation of warmth or coldness at the injection site. A metallic taste is also common and fades quickly.
Why the Tight Space Bothers People
The most common source of anxiety is the size of the tunnel. A traditional MRI bore is about 23 to 24 inches wide, which puts the walls close to your face and shoulders. You can’t sit up, and depending on the scan, you may be inside the tube for the better part of an hour. Even people who have never considered themselves claustrophobic sometimes feel uneasy in that position.
Studies consistently find that around 10% of MRI patients experience some level of claustrophobic reaction during the scan. About 15% report severe discomfort, and roughly 13% describe what feels like a panic attack. The number of scans that actually get cut short because a patient can’t continue is much smaller. A large international study found that 2.3% of patients worldwide needed sedation or couldn’t finish, which translates to nearly 2 million affected MRI procedures each year. Hospital-level data puts the premature termination rate closer to 1%. So while anxiety is common, most people do get through it.
How to Make It Easier
The single most helpful thing you can do is close your eyes before the table starts moving and keep them closed for the entire scan. Many people who panic do so because they open their eyes and see the ceiling of the tube inches from their face. With your eyes shut, the experience feels more like lying in a noisy room than being inside a narrow space.
Other strategies that help:
- Breathing techniques. Slow, steady breaths (in for four counts, out for six) activate your body’s relaxation response and give your mind something to focus on.
- Mental distraction. Count backward from 1,000, replay a favorite movie scene by scene, or mentally walk through your house room by room. The goal is to keep your brain occupied.
- Ask to go in feet first. If you’re having a lower-body scan, this is standard. For some upper-body scans it’s also possible, and it keeps your head near the open end of the tube.
- Request a washcloth over your eyes. This removes the temptation to look and adds a small sense of routine comfort.
- Talk to the technologist. They can tell you how much time is left between sequences. Knowing “this next part is four minutes” is far easier than lying there with no sense of the timeline.
Sedation for Severe Anxiety
If you know you’re claustrophobic or have had a panic attack in an enclosed space before, you can ask your doctor for a mild sedative to take before the appointment. These are typically anti-anxiety pills taken by mouth 30 to 60 minutes before the scan. They won’t knock you out. You’ll be awake and able to follow instructions, but the edge of panic will be significantly dulled.
The trade-off is that you’ll need someone to drive you home afterward. You also won’t be able to drive or operate machinery for the rest of the day. If you think you might want sedation, mention it when you schedule the scan so the medication can be prescribed in advance. Showing up already anxious and then trying to arrange sedation on the spot adds stress and delays.
Wide-Bore and Open MRI Options
Not all MRI machines are the same size. If the standard tunnel is your main concern, two alternatives exist. A wide-bore MRI has a tunnel opening of about 27.5 inches instead of the traditional 23 to 24 inches. Those extra 3 to 4 inches create a noticeably more spacious feeling, and the image quality remains high. Wide-bore machines also accommodate patients up to 500 pounds, compared to a 350-pound limit on older machines.
An open MRI eliminates the tunnel completely. Magnets sit above and below you while your sides stay fully open. This is the most comfortable option for people with severe claustrophobia. The downside is that open MRI scanners often produce less detailed images and scan times can be longer. Not every facility has one, and your doctor may prefer the image quality of a closed or wide-bore machine depending on what they’re looking for. It’s worth calling the imaging center to ask what type of machine they use before your appointment. If they only have a standard bore, you can often find a wide-bore machine at another location covered by your insurance.
What the Scan Feels Like Physically
There is no pain involved. The magnets don’t produce any sensation you can feel, and the radio waves are harmless. You might notice slight warmth in the area being scanned, which is normal and mild. The table is firm but padded, and the technologist will usually offer you a blanket and a pillow or foam wedge for your knees.
The hardest physical part for most people is staying still. Even small movements can blur the images and force the technologist to repeat a sequence, which extends the total time. If you have back pain or joint stiffness that makes lying flat uncomfortable, let the team know beforehand. They can sometimes adjust your positioning or add extra padding to help you stay comfortable longer. Some scans also require you to hold your breath for 10 to 20 seconds at a time, and the technologist will coach you through each one over the speaker.
What You’re Actually Hearing
The loud banging and buzzing is the most jarring part of the experience for first-timers. It comes from the machine’s gradient coils vibrating rapidly as they create the magnetic fields needed for imaging. The sounds change pattern every few minutes as the machine runs different imaging sequences. Some sequences sound like jackhammering, others like a rhythmic beeping, and some produce a low hum. Each sequence runs for a set length, usually two to six minutes, followed by a brief quiet pause. Those pauses are a good time to mentally reset. The noise is loud but predictable, and most people adjust to it within the first few minutes once they realize the pattern.