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Fever seizures (sometimes called fever convulsions or febrile seizures) can occur in children who have a rapid increase in body temperature. You may not even know that your child has a fever. The rapid increase in body temperature in a short period of time may happen at the same time as the fever seizure. After a fever has reached a high temperature, the risk of a seizure is probably over. Most children who have a fever seizure have armpit (axillary) temperatures above 38.5°C (101°F).
A seizure is likely to be fever-related if:
- There is one seizure in a 24-hour period.
- The seizure lasted less than 15 minutes.
- The seizure affected the entire body, not just one side of the body.
- The child is between 6 months and 5 years old.
- The child does not have nervous system (neurological) problems.
- The child has had fever seizures before.
Fever seizures can be frightening but they are not usually harmful to the child and do not cause long-term problems, such as brain damage, intellectual disabilities, or learning problems.
Fever seizures affect 2% to 5% of children. Children can have another seizure. The chance of another fever seizure varies with age, but about 30% to 50% will have another within a year of the first one. These seizures are not a form of epilepsy.
A child who is having a seizure often loses consciousness and shakes, moving his or her arms and legs on both sides of the body. The child's eyes may roll back. The child may stop breathing for a few seconds and might also vomit, urinate, or pass stools. It is important to protect the child from injury during a seizure.
Fever seizures usually last 1 to 3 minutes. After the seizure, the child may be sleepy. You can let the child sleep, but check him or her frequently for changes in colour or breathing, or for twitching arms or legs. The child also may seem confused after the seizure, but normal behaviour and activity level should return within 60 minutes of the seizure.
Check your child's symptoms to decide if and when your child should see a doctor.
Check Your Symptoms
Seek Care Today
Based on your answers, you may need care soon. The problem probably will not get better without medical care.
- Call your doctor today to discuss the symptoms and arrange for care.
- If you cannot reach your doctor or you don't have one, seek care today.
- If it is evening, watch the symptoms and seek care in the morning.
- If the symptoms get worse, seek care sooner.
Pain Severity, Child (3 and Up)
Pain in children 3 years and older
- Severe pain (8 to 10): The pain is so bad that the child can't stand it for more than a few hours, can't sleep, and can't do anything else except focus on the pain. No one can tolerate severe pain for more than a few hours.
- Moderate pain (5 to 7): The pain is bad enough to disrupt the child's normal activities and sleep, but the child can tolerate it for hours or days.
- Mild pain (1 to 4): The child notices and may complain of the pain, but it is not bad enough to disrupt his or her sleep or activities.
Fever Ranges, 11 and Younger
Temperature varies a little depending on how you measure it. For children up to 11 years old, here are the ranges for high, moderate, and mild according to how you took the temperature.
Oral (by mouth), temperature
- High: 40°C (104°F) and higher
- Moderate: 38°C (100.4°F) to 39.9°C (103.9°F)
- Mild: 37.9°C (100.3°F) and lower
A forehead (temporal) scanner is usually 0.3 C (0.5 F) to 0.6 C (1 F) lower than an oral temperature.
Ear or rectal temperature
- High: 40.5°C (104.9°F) and higher
- Moderate: 38.5°C (101.3°F) to 40.4°C (104.7°F)
- Mild: 38.4°C (101.1°F) and lower
Armpit (axillary) temperature
- High: 39.8°C (103.6°F) and higher
- Moderate: 37.8°C (100°F) to 39.7°C (103.5°F)
- Mild: 37.7°C (99.9°F) and lower
Note: For children under 5 years old, rectal temperatures are the most accurate.
Serious Illness Symptoms, Baby
Symptoms of serious illness in a baby may include the following:
- The baby is limp and floppy like a rag doll.
- The baby doesn't respond at all to being held, touched, or talked to.
- The baby is hard to wake up.
Serious Illness Symptoms, Adult or Older Child
Symptoms of serious illness may include:
- A severe headache.
- A stiff neck.
- Mental changes, such as feeling confused or much less alert.
- Extreme fatigue (to the point where it's hard for you to function).
- Shaking chills.
Dehydration Severity, Older Child
Severe dehydration means:
- The child's mouth and eyes may be extremely dry.
- The child may pass little or no urine for 12 or more hours.
- The child may not seem alert or able to think clearly.
- The child may be too weak or dizzy to stand.
- The child may pass out.
Moderate dehydration means:
- The child may be a lot more thirsty than usual.
- The child's mouth and eyes may be drier than usual.
- The child may pass little or no urine for 8 or more hours.
- The child may feel dizzy when he or she stands or sits up.
Mild dehydration means:
- The child may be more thirsty than usual.
- The child may pass less urine than usual.
Difficulty Breathing Severity, Baby or Young Child
Severe trouble breathing means:
- The child cannot eat or talk because he or she is breathing so hard.
- The child's nostrils are flaring and the belly is moving in and out with every breath.
- The child seems to be tiring out.
- The child seems very sleepy or confused.
Moderate trouble breathing means:
- The child is breathing a lot faster than usual.
- The child has to take breaks from eating or talking to breathe.
- The nostrils flare or the belly moves in and out at times when the child breathes.
Mild trouble breathing means:
- The child is breathing a little faster than usual.
- The child seems a little out of breath but can still eat or talk.
Petechiae and Purpura
Sudden tiny red or purple spots or sudden bruising may be early symptoms of a serious illness or bleeding problem. There are two types.
Petechiae (say "puh-TEE-kee-eye"):
- Are tiny, flat red or purple spots in the skin or the lining of the mouth.
- Do not turn white when you press on them.
- Range from the size of a pinpoint to the size of a small pea and do not itch or cause pain.
- May spread over a large area of the body within a few hours.
- Are different than tiny, flat red spots or birthmarks that are present all the time.
Purpura (say "PURR-pyuh-ruh" or “PURR-puh-ruh”):
- Is sudden, severe bruising that occurs for no clear reason.
- May be in one area or all over.
- Is different than the bruising that happens after you bump into something.
Dehydration (General, Baby or Young Child)
Babies can quickly get dehydrated when they lose fluids because of problems like vomiting or fever.
Symptoms of dehydration can range from mild to severe. For example:
- The baby may be fussy or cranky (mild dehydration), or the baby may be very sleepy and hard to wake up (severe dehydration).
- The baby may have a little less urine than usual (mild dehydration), or the baby may not be urinating at all (severe dehydration).
Joint Infection Symptoms
Symptoms of a joint infection may include:
- Severe pain.
- Sudden redness over or around the joint.
- Warmth in or around a joint.
- Not being able to move the joint because of pain or swelling.
- Pus draining from the area.
Try Home Treatment
You have answered all the questions. Based on your answers, you may be able to take care of this problem at home.
- Try home treatment to relieve the symptoms.
- Call your doctor if symptoms get worse or you have any concerns (for example, if symptoms are not getting better as you would expect). You may need care sooner.
Many things can affect how your body responds to a symptom and what kind of care you may need. These include:
- Your age. Babies and older adults tend to get sicker quicker.
- Your overall health. If you have a condition such as diabetes, HIV, cancer, or heart disease, you may need to pay closer attention to certain symptoms and seek care sooner.
- Medicines you take. Certain medicines and natural health products can cause symptoms or make them worse.
- Recent health events, such as surgery or injury. These kinds of events can cause symptoms afterwards or make them more serious.
- Your health habits and lifestyle, such as eating and exercise habits, smoking, alcohol or drug use, sexual history, and travel.
Impaired Immune System, Child
Certain health conditions and medicines weaken the immune system's ability to fight off infection and illness. Some examples in children are:
- Diseases such as diabetes, cystic fibrosis, sickle cell disease, and congenital heart disease.
- Steroid medicines, which are used to treat a variety of conditions.
- Medicines taken after organ transplant.
- Chemotherapy and radiation therapy for cancer.
- Not having a spleen.
Symptoms of heatstroke may include:
- Feeling or acting very confused, restless, or anxious.
- Trouble breathing.
- Sweating heavily, or not sweating at all (sweating may have stopped).
- Skin that is red, hot, and dry, even in the armpits.
- Passing out.
Heatstroke occurs when the body can't control its own temperature and body temperature continues to rise.
Symptoms of difficulty breathing can range from mild to severe. For example:
- You may feel a little out of breath but still be able to talk (mild difficulty breathing), or you may be so out of breath that you cannot talk at all (severe difficulty breathing).
- It may be getting hard to breathe with activity (mild difficulty breathing), or you may have to work very hard to breathe even when you’re at rest (severe difficulty breathing).
Symptoms of difficulty breathing in a baby or young child can range from mild to severe. For example:
- The child may be breathing a little faster than usual (mild difficulty breathing), or the child may be having so much trouble that the nostrils are flaring and the belly is moving in and out with every breath (severe difficulty breathing).
- The child may seem a little out of breath but is still able to eat or talk (mild difficulty breathing), or the child may be breathing so hard that he or she cannot eat or talk (severe difficulty breathing).
You can get dehydrated when you lose a lot of fluids because of problems like vomiting or fever.
Symptoms of dehydration can range from mild to severe. For example:
- You may feel tired and edgy (mild dehydration), or you may feel weak, not alert, and not able to think clearly (severe dehydration).
- You may pass less urine than usual (mild dehydration), or you may not be passing urine at all (severe dehydration).
Dehydration Severity, Baby or Young Child
Severe dehydration means:
- The baby may be very sleepy and hard to wake up.
- The baby may have a very dry mouth and very dry eyes (no tears).
- The baby may have no wet diapers in 12 or more hours.
Moderate dehydration means:
- The baby may have no wet diapers in 6 hours.
- The baby may have a dry mouth and dry eyes (fewer tears than usual).
Mild dehydration means:
- The baby may pass a little less urine than usual.
Call 911 Now
Based on your answers, you need emergency care.
Call 911 or other emergency services now.
Seek Care Now
Based on your answers, you may need care right away. The problem is likely to get worse without medical care.
- Call your doctor now to discuss the symptoms and arrange for care.
- If you cannot reach your doctor or you don't have one, seek care in the next hour.
- You do not need to call an
- You cannot travel safely either by driving yourself or by having someone else drive you.
- You are in an area where heavy traffic or other problems may slow you down.
Shock Symptoms, Baby or Young Child
Shock is a life-threatening condition that may occur quickly after a sudden illness or injury.
Symptoms of shock in a child may include:
- Passing out.
- Being very sleepy or hard to wake up.
- Not responding when being touched or talked to.
- Breathing much faster than usual.
- Acting confused. The child may not know where he or she is.
Fever Estimates, 11 and Younger
If you're not sure if a child's fever is high, moderate, or mild, think about these issues:
With a high fever:
- The child feels very hot.
- It is likely one of the highest fevers the child has ever had.
With a moderate fever:
- The child feels warm or hot.
- You are sure the child has a fever.
With a mild fever:
- The child may feel a little warm.
- You think the child might have a fever, but you're not sure.
Protect your child from injury during a seizure:
- Ease the child to the floor, or lay a very small child face down on your lap. Do not restrain the child.
- Turn the child onto his or her side, which will help clear the mouth of any vomit or saliva. This will help keep the tongue from blocking the air passage so the child can breathe. Keeping the head and chin forward (in the same position as when you sniff a flower) also will help keep the air passage open.
- Loosen clothing.
- Do not put anything in the child's mouth to prevent tongue-biting. This could cause injury.
- Try to stay calm, which will help calm the child. Comfort the child with quiet, soothing talk.
- Time the length of the seizure and pay close attention to the child's behaviour during the seizure so you can describe it to your child's doctor.
Check your child for injuries after the seizure:
- If the child is having trouble breathing, turn his or her head to the side and, using your finger, gently clear the mouth of any vomit or saliva to aid breathing.
- If the child does not need to see a doctor right away, put him or her in a cool room to sleep. Sleepiness is common following a seizure. Check on the child often. Normal behaviour and activity level should return within 60 minutes of the seizure.
If your child has had a fever seizure in the past and you have talked with your child's doctor about how to care for your child after a seizure, be sure to follow the doctor's instructions.
For home treatment of a fever, see the topic Fever or Chills, Age 11 and Younger.
Symptoms to watch for during home treatment
Call your doctor if any of the following occur during home treatment:
- Another seizure occurs with the same fever illness.
- Other symptoms of illness develop, such as an infection.
- Symptoms become more severe or frequent.
The best way to prevent fevers is to reduce your child's exposure to infectious diseases. Hand-washing is the single most important prevention measure for people of all ages.
Preparing For Your Appointment
To prepare for your appointment, see the topic Making the Most of Your Appointment.
You may feel upset after seeing a fever seizure. Stay calm. You can help your child's doctor diagnose and treat your child's condition by being prepared to answer the following questions:
- What is the history of the fever?
- When did the fever start?
- Did it come on suddenly or increase over several hours?
- How high is the fever?
- Does the child have any other symptoms?
- Does your child have frequent fevers? How long do they usually last?
- How was the child's health and behaviour before the seizure?
- Had the child had an accident or an injury before the seizure?
- What happened during the seizure?
- What kind of body movements were there?
- How long did the seizure last?
- How did the child act immediately after the seizure?
- Have you noted any injuries from the seizure?
- Has the child ever had a seizure before?
- What other health problems, if any, has the child had over the past 3 months?
- Has your child been eating, drinking, and playing normally?
- What home treatment measures, including non-prescription medicines, have you used? Did they help?
- Does your child have any health risks?
Ask your child's doctor what you can do to prevent another seizure and what to do if another seizure occurs.
Other Works Consulted
- American Academy of Pediatrics (2008). Clinical Practice Guideline for the Long-term Management of the Child With Simple Febrile Seizures. Elk Grove Village, IL: American Academy of Pediatrics.
Primary Medical Reviewer William H. Blahd, Jr., MD, FACEP - Emergency Medicine
Specialist Medical Reviewer H. Michael O'Connor, MD - Emergency Medicine
Current as ofMay 22, 2015
Current as of: May 22, 2015
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