If your child is having an allergic reaction, the first thing to do is assess how severe it is. A mild reaction, like a small patch of hives or some sneezing, can usually be managed at home. But if your child has trouble breathing, swelling of the face or throat, or seems dizzy or faint, that’s anaphylaxis, and you need to use epinephrine and call 911 immediately.
How to Tell if It’s Mild or Severe
Most allergic reactions in children start with skin symptoms: a few hives, redness, or itching at the site of contact. A runny nose, watery eyes, or mild stomach discomfort also fall on the milder end. These reactions are uncomfortable but not dangerous on their own.
The reaction becomes an emergency when it involves more than one body system at the same time. If your child breaks out in hives AND starts wheezing, or has vomiting AND looks pale or dizzy, that combination signals anaphylaxis. Specifically, anaphylaxis is likely when any of these occur after exposure to an allergen:
- Hives or swelling combined with breathing difficulty or a drop in blood pressure
- Two or more systems reacting at once: skin symptoms, breathing problems, vomiting or diarrhea, dizziness or fainting
- A sudden drop in blood pressure after contact with a known allergen (your child may look pale, feel limp, or say they feel “weird”)
Children with a history of asthma are at higher risk for severe breathing problems during anaphylaxis, so treat any wheezing in an allergic child as a serious warning sign.
For a Mild Reaction
If your child only has localized hives, mild itching, or a runny nose with no breathing trouble, you can give them an age-appropriate dose of an antihistamine. Remove or stop whatever caused the reaction if you can identify it. A cool compress can help with itchy skin. Watch them closely for at least the next hour, because mild reactions can sometimes escalate.
If symptoms spread, get worse, or you notice any sign of breathing difficulty or swelling beyond the original spot, treat it as a severe reaction.
For a Severe Reaction: Epinephrine First
If your child has a prescribed epinephrine auto-injector, use it at the first sign of anaphylaxis. Don’t wait to see if things improve on their own. Here’s how:
- Position your child. Small children should sit on your lap. Older children should sit or lie down.
- Prepare the injector. Take it out of its case and remove the safety cap (some brands have two caps). Hold it in a firm fist grip. Never put your thumb on either end.
- Find the spot. You’re aiming for the outer thigh, right in the big muscle on the side of the leg. You can inject through clothing if needed.
- Press firmly until you hear a click, then hold for 10 seconds. Don’t pull it away early and don’t bounce it against the skin.
- Call 911. Even if the epinephrine seems to work, your child still needs emergency medical evaluation. Epinephrine can wear off.
Keep a second auto-injector nearby. If symptoms return or don’t improve within 5 to 15 minutes, a second dose may be needed.
How to Position Your Child While Waiting for Help
Positioning matters more than most people realize during anaphylaxis. Lay your child flat on their back. If their blood pressure seems low (they look pale, feel clammy, or seem faint), raise their legs. If breathing is the main problem, let them sit up in a semi-reclined position, but keep monitoring them carefully.
Infants should be held horizontally across your body. Do not hold a baby upright or over your shoulder during a reaction.
Do not let your child stand or walk during or immediately after anaphylaxis, even if they seem to feel better. Standing can cause a sudden, dangerous drop in blood pressure.
When to Call 911
Call 911 or get to an emergency room if your child has any of the following:
- Swelling of the face, lips, tongue, or throat
- Difficulty breathing or swallowing
- Chest tightness or pain
- Hives spreading across the whole body
- Tingling in hands, feet, or lips
- Dizziness, weakness, or fainting
- A sense of dread (older children may say something feels very wrong)
If your child has never been diagnosed with allergies and you don’t have an auto-injector, call 911 immediately when you see these symptoms. Don’t try to drive to the hospital yourself if your child is struggling to breathe.
Why the Hospital Keeps You for Hours After
After epinephrine is given, current guidelines recommend observing children for 4 to 6 hours. This is because of something called a biphasic reaction, where anaphylaxis symptoms return a second time after the initial episode has resolved. The second wave can happen without any new exposure to the allergen. It’s not common, but it’s unpredictable, which is why the observation period exists. Some hospitals may monitor for longer depending on how severe the initial reaction was.
Common Triggers in Children
The nine major food allergens account for the vast majority of serious allergic reactions in kids: milk, eggs, peanuts, tree nuts (like almonds, walnuts, and pecans), wheat, soy, fish, shellfish (like shrimp, crab, and lobster), and sesame. Sesame was added to the official list in 2023. Beyond food, insect stings, latex, and certain medications can also trigger anaphylaxis.
If you don’t know what caused the reaction, try to note everything your child ate, touched, or was exposed to in the two hours before symptoms appeared. This information will be valuable for the allergist later.
Follow-Up After a Reaction
Any child who has had a significant allergic reaction should see an allergist. The most common diagnostic tools are skin prick testing, where small amounts of potential allergens are applied to the skin to check for a response, and blood tests that measure the immune system’s reaction to specific triggers. In some cases, a supervised oral food challenge may be done, where the child eats small amounts of a suspected food under medical observation to confirm or rule out the allergy.
After testing, the allergist will help you build a plan. This typically includes a prescription for epinephrine auto-injectors (and training on how to use them), a written emergency action plan for school and caregivers, and guidance on which foods or substances to avoid. If your child already has an auto-injector, check the expiration date regularly. Expired epinephrine loses potency and may not work when you need it most.