Is an MRI safe?
Last updated September 3, 2026.
For most people, yes - MRI uses no ionizing radiation, so the cancer-risk worry attached to x-rays and CT does not apply. The real hazards are magnetic: the always-on magnet can pull, heat, or disable metal in and on the body, which is why the implant and metal-fragment screening questions are strict. Contrast dye carries its own caution for people with poor kidney function.
What to do
- Answer the metal form completely. Pacemakers, clips, implants, old injuries with fragments - all of it matters.
- Bring implant cards. Device cards tell the team exactly what is inside you and its MRI conditions.
- Mention kidney problems. They change the contrast-dye decision.
- Say if you might be pregnant. Caution applies, especially early in pregnancy.
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