MRI Side Effects: What Can Happen After Your Scan
Most people walk out of an MRI exactly as they walked in. But "most" is not "all" — here is the complete honest list of what can follow a scan, from the mundane to the genuinely worth-watching-for.
Serious side effects from MRI are rare. The most common after-effects are mild: headache, fatigue, or dizziness from lying still; ringing ears for an hour or two from the noise; and after contrast, brief nausea or a warm memory of the flush. Warning signs that need attention are allergic-type symptoms (hives, swelling, breathing trouble), pain or swelling at the IV site, and — in people with kidney disease — changes suggesting a rare reaction to gadolinium.
What are the most common after-effects of an MRI?
The everyday ones: headache or grogginess from an hour of stillness and noise, temporary ringing in the ears (the machine is loud even with earplugs), stiffness from holding one position, and fatigue — some people find deep stillness oddly draining. All fade within hours and need no treatment beyond water, a snack, and normal movement.
What can follow an MRI with contrast?
Brief nausea or a metallic-taste memory are the common ones. Extravasation — contrast leaking into tissue around the IV — shows up as pain, swelling, or tightness at the site during or after injection; it is treated immediately and watched. Allergic reactions, from hives to rare anaphylaxis, typically appear within minutes to an hour. And the rarest category: in people with severe kidney impairment, certain gadolinium exposures have been linked to nephrogenic systemic fibrosis — the reason kidney screening exists. See contrast and kidney function.
Can an MRI make you feel dizzy or tired the next day?
Some people report a "wiped out" day after — attributed to the noise, the stillness, or simply anxiety spent. It is self-limited. Persistent dizziness, worsening headache, or anything that feels wrong beyond a day deserves a call to your doctor or the facility, not because MRI commonly causes it, but because symptoms deserve answers regardless of origin.
Is there any long-term risk from MRI scans?
For people with normal kidney function, there is no known long-term harm from the scan itself — no radiation is involved. The FDA has confirmed trace gadolinium retention in tissues without evidence of clinical harm. The genuine long-term considerations are practical: noise protection at every scan, honest screening, and keeping a record of contrast administrations.
When should I call my doctor after an MRI?
Immediately or urgently for: hives, facial or throat swelling, wheezing (call 911); pain, blistering, or worsening swelling at the IV site (call the facility); fever, severe headache, or fainting (call your doctor). Routine grogginess, mild headache, or ear ringing can simply be noted — and mentioned at your follow-up if they persist.
Call your doctor or 911 if you notice
- Breathing difficulty, throat tightness, widespread hives, or facial swelling — call 911 (allergic reaction)
- Pain, heat, blistering, or swelling at the contrast injection site — call the imaging facility (extravasation)
- Persistent vomiting, severe headache, confusion, or fainting — call your doctor the same day
- If you have kidney disease: new skin thickening, darkening, or joint stiffness in the weeks after — call your doctor promptly
Hydration Helper after contrast
If your MRI included contrast, extra water helps your kidneys clear the dye. Enter your weight:
Educational tool only. Not medical advice. If you have heart failure, kidney disease, or a fluid restriction, follow your care team's instructions and your facility's discharge sheet.
Something worrying you after a scan?
When in doubt, call — no question is too small for your care team or for us.
Contact SATMED HealthFrequently asked questions about MRI side effects
Is it normal to feel tired after an MRI?
Yes — many people feel drained for hours afterward. It passes with rest, food, and water.
Can MRI cause hearing damage?
The noise is loud but exposures are short with ear protection provided. Temporary ear ringing is common; lasting hearing effects from clinical MRI are very rare — tell the team if your ears ring for more than a day.
What does contrast extravasation feel like?
Pain, burning, tightness, or swelling around the IV site during or after injection. Report it immediately — it is treated on the spot.
How long do MRI side effects last?
Common ones — headache, fatigue, ear ringing — resolve within hours to a day. Anything beyond that, or anything severe at any point, deserves a call.
Can I drive after an MRI?
Yes, unless you took sedation. The scan and contrast alone do not impair driving.
Are there any side effects without contrast?
Only the mundane ones: noise-related ear ringing, stillness-related stiffness, and general tiredness.
How SATMED Health makes contrast imaging safer
If your exam includes contrast, the delivery equipment matters as much as the scanner. SATMED Health engineers the systems behind every injection.
Contrast injector systems built for controlled, consistent delivery — the right dose at the right moment, every time.
Learn more →Engineered syringes for smooth, low-pressure injections that reduce discomfort and protect the vessel at the IV site.
Learn more →Patient lines and accessories designed for safe, reliable contrast administration from injector to vein.
Learn more →Contrast management solutions that help departments prepare, verify, and track every dose before it reaches a patient.
Learn more →Keep reading
More free, clinician-reviewed guides from SATMED Health.
Sources
- RadiologyInfo.org (ACR · RSNA · ASRT). MRI Safety.
- U.S. Food and Drug Administration. FDA Drug Safety Communication: Gadolinium-Based Contrast Agents (GBCAs) are retained in the body.
- American College of Radiology. ACR Manual on Contrast Media — current edition.
- RadiologyInfo.org (ACR · RSNA · ASRT). How to Prepare for Your MRI Exam. Reviewed June 15, 2026.
Rare risks, honestly told, calmly managed
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Contact SATMED HealthMedical disclaimer: This article is for education only and is not medical advice, diagnosis, or treatment. Always follow the instructions of your imaging facility and your own physician. If you think you are having an emergency, call 911 (or your local emergency number) immediately.
Please note: SATMED Health is not a medical facility. Please contact your physician with specific medical questions or for a referral to a radiologist. To locate an accredited medical imaging provider in your community, search the ACR accredited facilities database. This website does not provide cost information; imaging costs vary by region.
