Hives (Urticaria) in Children: Causes, Home Care, and When It's an Emergency
Hives — called urticaria by doctors — are one of the most startling things a parent can see appear on their child's skin. One moment your child looks normal, and the next there are raised, red, blotchy welts spreading across their skin. If your child has developed hives, our team at Hummingbird Pediatrics in Robbinsville, NJ is here to help you understand what happened and what to do next.
What Do Hives Look Like?
Hives appear as raised, red or skin-colored welts that can range in size from a few millimeters to several centimeters across. They are usually intensely itchy. Individual hives may fade and new ones may appear in different areas — sometimes over a period of hours. Hives that last less than 6 weeks are called acute urticaria. When they persist beyond 6 weeks, they are classified as chronic urticaria, which warrants a more thorough evaluation.
Common Triggers
Hives can be triggered by many things, including:
- **Foods**: Peanuts, tree nuts, shellfish, fish, milk, eggs, and soy are among the most common food triggers
When to Call Our Office vs. When to Go to the Emergency Room
Knowing when to call us versus when to seek emergency care is critical with hives.
**Call Hummingbird Pediatrics if your child develops hives AND:** - The hives appeared after starting a new medication - Hives are recurring or have appeared more than once without a clear cause - Your child has hives along with a fever, which may signal an underlying infection - Hives have not resolved within 24 hours - You are not sure what triggered the hives - You want guidance on next steps or allergy testing
**Go to the Emergency Room immediately if your child has ANY of the following:** - Difficulty breathing or swallowing - Swelling of the lips, tongue, throat, or face - Sudden drop in blood pressure or signs of shock (pale skin, rapid weak pulse, dizziness) - Loss of consciousness or unresponsiveness - Hives combined with vomiting, stomach pain, and dizziness together — which may signal anaphylaxis
Anaphylaxis: A Medical Emergency
Hives are sometimes the first sign of anaphylaxis, a severe, life-threatening allergic reaction. Anaphylaxis requires immediate epinephrine (EpiPen) and a 911 call — antihistamines are not sufficient and are not a substitute for epinephrine in anaphylaxis.
Signs of anaphylaxis include hives combined with: - Swelling of the lips, tongue, or throat - Difficulty breathing, wheezing, or hoarse voice - Rapid heartbeat or dropping blood pressure - Fainting or sudden weakness - Vomiting or severe stomach cramping
**If your child has a known epinephrine auto-injector (EpiPen), use it immediately if anaphylaxis is suspected. Then call 911.**
What to Do If Your Child Has Hives
If your child develops hives without any of the above emergency signs: - Administer a non-sedating antihistamine such as cetirizine (Zyrtec) or loratadine (Claritin) per the dosing instructions on the package - Apply a cool, damp cloth to itchy areas for comfort - Avoid tight clothing over affected areas - Try to identify and remove the potential trigger
Call our office to discuss whether your child needs to be seen, whether allergy testing is appropriate, and whether a prescription antihistamine or other treatment is recommended.
Our team at Hummingbird Pediatrics serves families across Robbinsville, Hamilton, East Windsor, West Windsor, Plainsboro, and Mercer County and is ready to help you navigate allergic reactions and allergy season with confidence.
Frequently Asked Questions
How long do hives last in children?
Individual hive welts typically last 30 minutes to a few hours, then fade. New hives can appear in other areas. Acute hives (triggered by infection, allergen, or medication) usually resolve within days to a few weeks. Chronic hives (lasting more than 6 weeks) are less common in children and warrant evaluation by your pediatrician or allergist.
My child has hives but seems fine otherwise — do I still need to call the doctor?
If your child has hives only (no swelling of the face or throat, no breathing difficulty, no vomiting), is comfortable, and the hives are responding to antihistamines, you can manage at home. Call our office to discuss what triggered the reaction and whether allergy testing is appropriate. If anything changes rapidly, go to the ER.
What antihistamine can I give my child for hives?
Cetirizine (Zyrtec) or loratadine (Claritin) are good non-drowsy options for daytime use. Diphenhydramine (Benadryl) works faster but causes drowsiness. Dosing is always by weight — check the packaging or call our office for the correct dose for your child's age and weight.
Can hives be caused by a viral infection?
Yes, viral infections are actually one of the most common causes of hives in young children. The immune response to a cold, stomach bug, or other illness can trigger hive outbreaks. These typically resolve when the illness does and are not a sign of a serious allergic condition.
My child gets hives every spring — could this be allergies?
Yes, seasonal pollen (trees in spring, grasses in summer, ragweed in fall) can trigger hives in children with pollen allergies, especially if the pollen also contacts the skin. If your child has recurrent hives during allergy season, talk to us about allergy testing and whether daily antihistamines during peak season could help.
What is anaphylaxis and how is it different from hives?
Anaphylaxis is a severe, life-threatening allergic reaction that can begin with hives but quickly progresses to involve the throat (swelling, difficulty swallowing), lungs (wheezing, trouble breathing), and circulation (dizziness, fainting). Hives alone are not anaphylaxis. Anaphylaxis requires immediate epinephrine and a 911 call — antihistamines alone are not enough.
Should my child carry an EpiPen if they've had hives?
Not every child who has had hives needs an epinephrine auto-injector. An EpiPen is typically prescribed when a child has had anaphylaxis, has a confirmed severe allergy (peanuts, tree nuts, insect venom), or has risk factors for severe reactions. Talk to us about whether an EpiPen is appropriate for your child after evaluating their history.
How can I figure out what caused my child's hives?
Keep a diary of what your child ate, any medications taken, activities, and environmental exposures in the 24 hours before hives appeared. Bring this to your pediatric appointment. Allergy testing (skin prick test or blood test) can help identify specific allergens. In many children, a definitive trigger is never found — this is common and does not indicate a dangerous condition.
Need Personal Guidance?
This article provides general information. For questions specific to your child's health, please call our office or book an appointment online.