An MRI scan does not cause pain in the traditional sense. There is no cutting, no radiation burn, and no needle unless contrast dye is needed. What an MRI does produce is a surprisingly intense set of sensations that nobody warns you about: pounding noise, occasional warmth, strange twitching feelings, and the psychological weight of lying motionless inside a narrow tube. Whether any of this crosses the line into “hurt” depends on the person, the body part being scanned, and the strength of the machine.
The Noise Is the Biggest Surprise
If you have never had an MRI, the sound is the thing most likely to catch you off guard. The machine produces loud knocking, buzzing, and hammering that can reach sound pressure levels as high as 130 decibels, which approaches the maximum of 140 dB that the U.S. Food and Drug Administration allows. That upper range is comparable to standing near a jackhammer. The noise comes from the gradient coils inside the scanner vibrating under powerful electromagnetic forces as they rapidly switch on and off during imaging sequences.1PubMed Central. Overview of Methods for Noise and Heat Reduction in MRI Gradient Coils
The character of the noise changes throughout the scan. Some sequences produce a rapid-fire tapping, others a low drone, and still others a high-pitched whine in the 1 to 1.4 kHz range where MRI noise tends to be most intense. The pattern shifts every few minutes as the technologist runs different imaging protocols. People often describe it as being inside a construction site, though the rhythmic quality can be oddly hypnotic once the initial shock passes.
Every MRI facility provides hearing protection, typically foam earplugs, over-ear headphones, or both. The combination matters. Earmuffs alone reduce perceived sound by roughly 30 to 37 dB in the loudest frequency range, while earplugs alone provide about 25 to 28 dB of reduction. Using both together gets you to around 39 to 41 dB of attenuation, and adding a specialized acoustic helmet can push that to 55 to 63 dB.2PubMed Central. Isolating the auditory system from acoustic noise during functional magnetic resonance imaging: examination of noise conduction through the ear canal, head, and body Most clinical scans rely on earplugs plus headphones, which is adequate for standard 1.5T and 3T machines as long as the protection is properly fitted.3PubMed. A Review of MRI Acoustic Noise Outputs and Hearing Protection Device Performance
Can the noise actually damage your hearing? Cases of temporary and even permanent hearing changes after MRI have been reported, including sensorineural hearing loss and tinnitus.4PubMed Central. Sensorineural hearing loss after magnetic resonance imaging One documented case involved a patient who developed unilateral hearing loss and persistent tinnitus after a 3T scan for chronic back pain; the hearing loss recovered within three days, but the tinnitus lingered.5PubMed. Hearing loss after noise exposure These cases are rare and typically involve situations where hearing protection was inadequate or improperly worn. A study testing dual hearing protection during ultra-high-field 7T scans found no significant changes in outer hair cell function after multiple scanning sessions, with effect sizes that were small across all measured frequencies.6Radiography. Dual hearing protection effectively preserves outer hair cell function during 7 T MRI The takeaway: wear whatever hearing protection the facility gives you, and wear it properly. Do not pull an earplug out because it feels uncomfortable.
Warmth from Radiofrequency Energy
MRI scanners use radiofrequency pulses to generate images, and those pulses deposit energy into your body as heat. Most people feel nothing, or at most a mild warming sensation, particularly in areas where tissue is thicker or where skin surfaces are close together (like between the thighs or under the arms). The effect increases with stronger magnets and longer scan times.7Concepts in Magnetic Resonance Part B. Thermal Effects Associated with RF Exposures in Diagnostic MRI: Overview of Existing and Emerging Concepts of Protection
Actual RF burns, while uncommon, are the most frequently reported physical injury during MRI. They tend to happen when something creates a pathway for electrical current to concentrate: a patient’s skin touching the bore wall, arms crossed against the body, or external cables like ECG leads forming conductive loops.8PubMed Central. Progress in Understanding Radiofrequency Heating and Burn Injuries for Safer MR Imaging This is why technologists are meticulous about positioning. They place padding between your skin and the bore, straighten cables, and make sure your arms and legs are not crossed or touching each other. If you feel an unexpected hot spot during a scan, squeezing the call button to alert the technologist is the right move.
Tingling, Twitching, and Peripheral Nerve Stimulation
One of the more unnerving MRI sensations is a sudden involuntary twitch or a tingling feeling, sometimes described as a mild electric buzz under the skin. This is peripheral nerve stimulation, and it happens because the rapidly switching magnetic field gradients induce tiny electrical currents in your body that are strong enough to tickle your nerves.9Physics in Medicine & Biology. Interaction of MRI field gradients with the human body The sensation ranges from barely perceptible to mildly uncomfortable, and at higher intensities it can feel genuinely painful, though scanners are calibrated to stay well below the pain threshold.
At standard clinical field strengths (1.5T and 3T), peripheral nerve stimulation is occasional and usually faint. In research-grade ultra-high-field scanners, it becomes much more common. A study of 7T MRI examinations found that participants experienced twitching during about two-thirds of scans, most commonly in the torso, hands, and arms when entering the scanner head-first.10PubMed Central. Short‐term effects experienced during examinations in an actively shielded 7 T MR As gradient hardware becomes more powerful to enable faster imaging, peripheral nerve stimulation is increasingly becoming a practical limit on how quickly the machine can run.11PubMed Central. Prediction of peripheral nerve stimulation thresholds of MRI gradient coils using coupled electromagnetic and neurodynamic simulations
If you feel twitching during a scan, it is not a sign that something has gone wrong. It is a known physical effect, and it stops the moment the sequence ends. But if the sensation crosses into pain or becomes distressing, use the call button.
Claustrophobia and the Psychological Side
For many people, the hardest part of an MRI has nothing to do with physical sensation. Standard closed-bore scanners are essentially a tube about 60 centimeters (roughly two feet) in diameter, and you may spend anywhere from 15 minutes to over an hour inside it, depending on what is being imaged. A meta-analysis of MRI claustrophobia found that about 1.2% of all scans are terminated early because the patient cannot tolerate the enclosed space.12Radiography. Claustrophobia in magnetic resonance imaging: A systematic review and meta-analysis That number sounds small, but given the millions of MRI scans performed each year, it represents a substantial number of incomplete exams.
Among people who already know they are claustrophobic, the problem is much more pronounced. One study of highly claustrophobic patients found that nearly 60% could not finish their scan in a conventional closed-bore machine, with average anxiety scores of 87 out of 100.13PubMed. MR imaging of claustrophobic patients in an open 1.0T scanner: motion artifacts and patient acceptability compared with closed bore magnets The same study showed that switching those patients to an open-bore scanner dropped the termination rate to about 8% and cut anxiety scores to around 30 out of 100, with minimal impact on image quality.
Open and upright MRI systems have continued to improve. A more recent comparison found that patients in open upright scanners reported claustrophobia roughly a third as often as those in closed systems, with far fewer premature terminations and dramatically less need for sedation.14Radiography. Patient-centric comparative analysis of experiences in open upright and conventional closed MRI scanners The trade-off is that open scanners generally operate at lower field strengths and may not be suitable for every type of exam. If claustrophobia is a serious concern, asking your referring physician whether an open scanner is an option for your specific study is worth doing before the appointment.
Even with a closed-bore machine, several strategies help. Some facilities offer MRI-compatible goggles that display video content, and a pediatric trial found that audiovisual distraction significantly lowered anxiety scores compared to standard care.15PubMed Central. Using audiovisual intervention to reduce anxiety and improve image quality in pediatric magnetic resonance imaging Others allow you to listen to music through MRI-safe headphones. Entering the scanner feet-first (when the anatomy being scanned allows it) keeps your head near the open end and can make a meaningful difference in comfort. And mild sedation is an option your doctor can prescribe for severe anxiety, though it requires someone to drive you home.
The Discomfort of Lying Still
This one is easy to underestimate. MRI requires you to stay very still for extended periods, and the table you lie on is not exactly plush. Surveys of patients undergoing ultra-high-field MRI consistently rank examination duration as the single most complained-about source of discomfort, ahead of the noise and ahead of any field-related sensations.16Investigative Radiology. Multicenter Study of Subjective Acceptance During Magnetic Resonance Imaging at 7 and 9.4 T17PubMed. A large-scale study on subjective perception of discomfort during 7 and 1.5 T MRI examinations
If you have back pain, shoulder issues, or any musculoskeletal condition, holding a fixed position for 30 to 60 minutes can genuinely hurt. The technologist can usually offer extra padding, knee bolsters, or blankets. Asking before the scan starts is better than suffering through it, because any movement during the scan means blurry images and potentially having to repeat the sequence. If you know a particular position is painful for you, mention it at check-in so the team can plan around it.
Tattoo Reactions
People with tattoos sometimes report a burning or stinging sensation at the tattoo site during MRI. This has historically been attributed to RF energy heating the metallic particles in certain inks, particularly older formulations containing iron oxide. The actual science, though, tells a more complicated story. Multiple studies measuring skin surface temperature at tattoo sites during and after MRI have found no significant temperature increase, and laboratory experiments exposing tattoo inks to MRI conditions have reproduced the same null result.18PubMed Central. On the mechanism of painful burn sensation in tattoos on magnetic resonance imaging (MRI)19American Journal of Case Reports. Unveiling the Temporal Aspect of MRI Tattoo Reactions: A Prospective Evaluation of a Newly-Acquired Tattoo with Multiple MRI Scans
The sensation people feel appears to be real but is not a thermal burn. The mechanism remains unclear, and current research suggests the literature may have mischaracterized these events as thermal injuries when the underlying cause is something else entirely. For practical purposes, having a tattoo is not a reason to avoid MRI. If you feel discomfort at a tattoo site during a scan, alert the technologist, but know that genuine tissue damage from modern tattoo ink during MRI has not been substantiated.
Contrast Injection
Not every MRI requires contrast dye, but when it does, a gadolinium-based agent is injected through an IV line, usually in your arm. The injection itself feels like any standard IV: a brief pinch when the needle goes in, and possibly a cool or warm sensation as the contrast flows through your veins. Some people experience a metallic taste in their mouth for a minute or two.
The main physical risk from contrast injection is extravasation, where the contrast leaks out of the vein into surrounding tissue. Most extravasations cause only minor swelling and redness that resolves on its own. In rare cases, larger volumes of leaked contrast can cause more significant tissue damage or compartment syndrome.20PubMed. Contrast medium extravasation injury: guidelines for prevention and management The technologist monitors the injection site during administration, and if you feel sudden pain or swelling at the IV site, telling them immediately allows them to stop the injection before it becomes a problem.
Dizziness and Vertigo Near Strong Magnets
Some people feel dizzy, lightheaded, or even nauseated when moving near a strong MRI magnet. This is most noticeable when entering or leaving the bore, and it happens because the magnetic field interacts with the vestibular system in your inner ear, creating a false sense of motion. The effect increases with field strength. It has been well documented at 3T and becomes more common at research-grade 7T and above.21PubMed Central. Acute vertigo in an anesthesia provider during exposure to a 3T MRI scanner
The dizziness is temporary and typically fades within seconds to minutes once you are stationary inside the scanner or after you are moved out. Moving slowly into and out of the bore reduces it. If you are prone to motion sickness, it is worth mentioning to the technologist; they can move the table more slowly and give you a moment to adjust once you are in position.
How Expectation Shapes the Experience
Something worth knowing about MRI discomfort is that your expectations going in meaningfully affect how you experience it. Research on pain perception has shown that when people expect a stimulus to be less intense than it actually is, they rate their discomfort lower than people whose expectations match reality. This effect is not just psychological hand-waving; it corresponds to measurable differences in brain activity in regions that process and modulate pain.22PubMed Central. Effect of Expectation on Pain Processing: A Psychophysics and Functional MRI Analysis
This has a practical implication. If you go into an MRI expecting it to be unbearable, you are likely to experience more distress than if you go in knowing what to expect and feeling prepared. The most effective thing you can do is learn what the scan will involve beforehand: how long it will take, what the noise will sound like (many MRI facilities have sample audio online), and what options you have for comfort aids. Familiarity deflates the anxiety.
Children and MRI
MRI presents a particular challenge for young children, who may not understand what is happening and cannot easily stay still for long periods. The traditional approach has been sedation or general anesthesia, but there is growing evidence that preparation programs can eliminate the need for sedation in most kids. A randomized trial testing three preparation approaches for young children found that about 91% successfully completed an awake MRI regardless of which method was used: a mock scanner visit at the hospital, a session with a child life specialist, or at-home preparation with educational materials.23PubMed. Effectiveness of training before unsedated MRI scans in young children: a randomized control trial
Mock scanner sessions, where children practice lying still inside a replica machine that makes similar sounds, appear to be particularly effective at reducing fear and worry. A separate simulation-based study found that 90% of children who completed a simulation session went on to finish their real MRI without general anesthesia, and all of those scans were diagnostically adequate.24PubMed Central. Pediatric brain MRI without sedation: Optimization by simulation If your child needs an MRI, asking the facility whether they offer a mock scanner visit or child life preparation is one of the most useful things you can do. Avoiding anesthesia eliminates its own set of risks and discomforts.
What You Might Feel After the Scan
Most patients walk out of an MRI feeling completely normal. But some people report mild aftereffects, particularly after long sessions or higher-field scans. A study of MRI technologists who spend their working days near scanners found high rates of transient symptoms including tiredness, difficulty concentrating, and headache, with most of these symptoms appearing during exposure and fading within about 30 minutes afterward.25PubMed. Subjective symptoms and their evolution in a small group of magnetic resonance imaging (MRI) operators recently engaged These were occupational exposures, meaning the workers spent hours near the magnetic field day after day, which is a very different situation from a single diagnostic scan. Still, if you feel a bit foggy or tired after your MRI, you are not imagining it, and it should resolve quickly.
Contrast-enhanced scans can occasionally produce mild nausea or a headache in the hours after the injection, and you may notice the injection site is slightly sore. Drinking extra water after a contrast MRI helps your kidneys clear the gadolinium more efficiently. Any swelling, warmth, or worsening pain at the IV site beyond what you would expect from a routine blood draw warrants a call to your doctor.