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What Is an MRI?

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Simple Answer

An MRI is an imaging test that is usually painless. It uses magnets, radio waves, and a computer to make detailed pictures of the inside of your body. It can show organs and soft tissues clearly and does not use x-rays or other radiation.

What It Means

Doctors may use an MRI to look at areas like the brain, spinal cord, nerves, muscles, ligaments, tendons, and joints. It can also help doctors find health problems or check how treatment is working.

When to Contact a Doctor

Talk to your health care provider before the scan if you are pregnant, breastfeeding, have kidney problems, feel anxious in enclosed spaces, or have metal in your body or an implanted device. Also tell them if you have tattoos or permanent makeup.

Get Urgent Help If…

The source material does not list emergency warning signs for MRI itself. If you have a pacemaker, metal fragments, or other metal or electronic devices in your body, tell your provider before the MRI because metal can interfere with the scan and may be unsafe.

You will usually need to remove jewelry, watches, hairpins, and hearing aids before the scan. Some MRI machines are open, and the test can take some time.

Sources

This information is based on these free U.S. government medical sources:

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This service provides general medical information and education. It does not diagnose medical conditions or replace care from a physician or other qualified healthcare professional. If you may be experiencing a medical emergency, call 911.