Q: My toddler's fever spiked to 39°C after taking acetaminophen, and her hands and feet are cold. Should we go to the ER for an injection?

Myeongchan Kim
5 hours ago
3 min read

Medically reviewed by Sang Hyun Ahn, MD

Content edited by Myeongchan Kim, MD

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.

Question:

My child's fever won't go down. She had a high fever (39°C / 102.2°F) last night. I gave her fever reducers all night, and we visited the clinic today. Last night, her fever would drop after the medication but rise again later.

At the clinic this morning, she tested negative for the flu. The doctor said she has a very swollen throat and a runny nose, so we were prescribed acetaminophen, antibiotics, and cold medicine. Her fever stayed around 38.3°C (100.9°F), so I gave her 6mL of acetaminophen an hour ago. (She is a 27-month-old girl weighing 14kg / 30.8 lbs).

An hour has passed, but instead of dropping, her fever has spiked to 39°C (102.2°F). Should I take her back to the hospital right now for an antipyretic (fever-reducing) injection? I don't know what to do because the fever went up after the medicine. Her hands and feet are currently very cold.

Answer:

I understand you must be very worried since the high fever has persisted since last night.

Current Situation Summary:

27-month-old girl, 14kg.
High fever of 39°C since yesterday → tested negative for flu today, diagnosed with pharyngitis (sore throat) and a runny nose.
1 hour after taking 6mL of acetaminophen → fever increased from 38.3°C to 39°C.
Cold hands and feet.

Key Medical Point:

If her hands and feet are cold while her temperature is rising, she is currently in the fever-rising phase (chill phase). Fever-reducing medications work by lowering the brain's internal temperature set-point, but it takes about 1 to 2 hours for the body to actually cool down to that new target temperature. As long as her hands and feet are cold, her body is actively generating heat. You need to wait a little longer for the fever reducer to fully take effect.

What to Do Right Now:

Warm her extremities: Put thin socks on her or cover just her hands and feet with a light blanket. Keep her torso lightly clothed so heat can escape.
Manage room temperature: Maintain the room between 22–24°C (71–75°F) and dress her in a single, light layer of breathable clothing.
Monitor: Check her temperature again in 30 minutes to 1 hour. It is highly likely her fever will start to drop as her hands and feet become warm again.
Hydrate: Offer small amounts of water or electrolyte drinks frequently, every 5 to 10 minutes.

An antipyretic injection is not necessary at this moment:

A fever-reducing injection has the same ultimate effect as oral medication. The priority right now is simply giving the oral medicine the time it needs to work in her system.

Seek emergency care (ER) tonight if any of the following occur:

Her hands and feet do not warm up after 1–2 hours, or her fever stays at or above 40°C (104°F).
She shows signs of difficulty breathing (sucking in under the ribcage, nasal flaring, wheezing, or grunting).
She has no urine output for more than 8 hours.
She is excessively lethargic, constantly falling asleep, and very difficult to wake up.
She develops a stiff neck, severe headache, or repeated vomiting.

Revisit your pediatrician tomorrow during the day if:

The fever pattern does not improve at all even after 48 hours of taking the prescribed antibiotics.
She is lethargic and refuses to eat or drink even when her fever comes down.
New symptoms appear, such as a skin rash, ear pain, or changes in breathing.

For today, start by keeping her hands and feet warm, providing plenty of fluids, and closely observing her condition over the next 1 to 2 hours.

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

https://fevercoach.us