Magnetic Resonance Imaging (MRI) uses strong magnetic fields and radio waves to create detailed images of the body’s internal structures. This non-invasive technique helps diagnose and monitor a wide range of conditions. While generally considered safe and free from ionizing radiation, some individuals may experience uncomfortable sensations or temporary side effects. Severe reactions during an MRI are rare.
Understanding Discomfort During an MRI
Discomfort during an MRI can stem from physiological responses and psychological factors. One common reason for feeling unwell is claustrophobia, an intense fear of confined spaces. The enclosed environment of a traditional MRI machine can trigger panic, anxiety, nausea, or dizziness. These reactions are often due to the body’s natural fight-or-flight response.
The loud, repetitive knocking and banging sounds can also contribute to discomfort. These noises, caused by the rapid switching of magnetic fields, can be startling or annoying and may lead to headaches or unease, especially during prolonged scans. Some patients might also notice a slight warming sensation, which is a normal result of radiofrequency energy absorption by tissues. While usually harmless, this sensation can sometimes feel unsettling.
For certain MRI scans, a contrast agent may be injected to enhance image clarity. While contrast agents are generally considered safe, a small percentage of patients might experience mild, temporary side effects such as nausea, headache, or a cold sensation at the injection site. More severe allergic reactions are extremely rare. Additionally, remaining motionless on the hard table for the duration of the scan may cause muscle stiffness, numbness, or general discomfort, especially for those with pre-existing pain conditions. Slight table movements or being in an awkward position can also contribute to mild dizziness.
Addressing Unpleasant Sensations
Communicating any discomfort or symptoms to the MRI technologist is important during or immediately after the scan. Technologists can be reached through an intercom system or by using a call button, and they can pause the scan if necessary. It is helpful to report specific symptoms such as nausea, dizziness, headache, increased anxiety, lightheadedness, or feeling flushed.
Mild symptoms usually subside quickly once the scan is complete. Patients are advised to take their time getting up from the table after the procedure. If symptoms are severe, persistent, or worsen after leaving the facility, such as a severe headache, persistent vomiting, a rash, or difficulty breathing, seeking medical attention is recommended. While such occurrences are uncommon, prompt evaluation can ensure appropriate care.
Preparing for a More Comfortable Scan
Taking proactive steps before an MRI can help minimize the chances of feeling unwell. Discussing any anxieties, claustrophobia, or a history of motion sickness with your referring doctor or the MRI facility staff is beneficial. For individuals with significant anxiety or claustrophobia, mild sedation might be an option, which should be discussed with the doctor before the appointment.
Open MRI machines are available for some types of scans and can provide a less confining experience for those with claustrophobia, as they do not fully encase the body. While open MRIs prioritize comfort, they may not offer the same image quality as traditional closed machines for all diagnostic needs. Following any specific pre-scan instructions, such as restrictions on food or drink, is also important, especially if a contrast agent will be used. Requesting earplugs or headphones to mitigate the loud noises, or asking for a blanket can enhance comfort during the scan. Practicing relaxation techniques, such as deep breathing or visualization, can also help manage anxiety throughout the procedure.