A magnetic resonance imaging (MRI) scan is a safe and commonly used test, but some people worry when they feel warm, flushed, or even notice a fever after MRI. While most cases are harmless, understanding the causes, symptoms, and when to seek help is important — especially if discomfort continues. In this guide, ER of Mesquite explains everything in easy words to help you stay informed.

What Is an MRI and How Does It Affect Your Body?

An MRI is a scan that uses magnetic fields and radio waves to create detailed images inside the body. It does not use radiation and usually does not cause major side effects.
However, the experience can cause temporary physical responses like:

• Mild warmth from the machine

• Stress or anxiety

• Body fatigue

• Slight temperature sensitivity

Most people feel normal shortly after the test.

Can an MRI Cause Fever?

In general, the MRI machine itself does not cause a true fever. But some situations around the scan may lead to a raised temperature or fever-like feeling.

Common reasons people feel feverish after MRI:

✔ 1. Anxiety or Stress Response

Feeling nervous during the scan can raise heart rate and body temperature temporarily.
This can feel like fever, even when your temperature is normal.

✔ 2. Warmth From the MRI Coils

Some MRI coils slightly warm up. This warmth is safe but may make the body feel heated for a short time.

✔ 3. Reaction to Contrast Dye (Gadolinium)

Most contrast reactions are very mild, like:

• Headache

• Nausea

• Mild warmth

• Slight fever in rare cases

A true allergic reaction is rare but requires medical attention.

✔ 4. Underlying Illness

Sometimes the fever is not from the MRI at all — it may be from the condition you’re being tested for, such as:

• Infection

• Inflammation

• Chronic disease flare-up

✔ 5. Dehydration or Fatigue

Longer scans may cause tiredness or overheating. Drinking too little water can also affect the body’s temperature.

Symptoms You May Notice After an MRI

If someone experiences fever after the scan, they may also notice symptoms like:

• Headache

• Body aches

• Tiredness

• Mild chills

• Warm flush

• Nausea

• Slight dizziness

These symptoms usually pass within a few hours.

When Is Fever After MRI a Concern?

Most cases are harmless, but sometimes fever can indicate a reaction or developing illness.

Seek medical help if the fever:

• 🌡 Stays above 100.4°F (38°C) for more than 24 hours

• 🌡 Starts suddenly with chills

• 🌡 Comes with rash, swelling, or trouble breathing

• 🌡 Occurs after contrast dye injection

• 🌡 Comes with severe pain or vomiting

• 🌡 Happens in children, seniors, or people with weak immunity

How to Feel Better After an MRI

If your fever or warmth is mild, try these simple care tips:

• Drink plenty of water

• Rest for a few hours

• Take a light meal

• Use a cool compress

• Take acetaminophen (Tylenol) if needed (if safe for you)

• Avoid strenuous activity for the day

Most people feel completely normal by the next day.

Contrast Dye & Fever: What You Should Know

MRI contrast dye (gadolinium) helps doctors see clearer images.
Reactions are uncommon, but when they happen, symptoms may include:

• Mild fever

• Headache

• Fatigue

• Itchy skin

• Nausea

Serious reactions are very rare but require immediate medical attention.

When to Visit ER of Mesquite

Visit ER of Mesquite immediately if you experience:

• Difficulty breathing

• Severe allergic reaction

• High fever

• Chest pain

• Persistent vomiting

• Rapid swelling

• Sudden weakness or fainting

Our emergency team provides fast care 24/7 with no long wait times. Your safety after any medical scan matters.

FAQs About Fever After MRI

1. Is it normal to have a fever after an MRI?

A mild fever-like feeling can happen, but a true fever is uncommon.

2. Can MRI contrast dye give you a fever?

Yes, but only in rare cases. Most reactions are mild and go away quickly.

3. How long does the fever last?

Usually a few hours. If it continues longer than 24 hours, seek medical care.

4. Should I worry about infection after MRI?

MRI machines don’t cause infections. If you have an infection, the scan may just reveal symptoms you already had.

5. When should I go to the ER?

Go to the ER if fever is high, lasts too long, or comes with breathing problems, rash, or severe pain.

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