Rio Grande Regional Hospital - June 02, 2026

A child scratches an itchy arm outdoors, a symptom that can occur with a mild allergic reaction or insect bite.

If your child breaks out in hives or starts sniffling after eating something new, it’s normal to wonder: Is this something I can watch at home, or do I need urgent care or emergency care?

Most allergic reactions are mild and improve with simple treatments at home. But some can become serious quickly, so it helps to know the warning signs.

What causes allergic reactions?

Allergic reactions occur when the immune system overreacts to a substance such as food, medication, insect stings, latex or environmental allergens. Allergies affect millions of people each year and can vary widely in severity, according to the Centers for Disease Control and Prevention. These reactions happen when your body responds to something it sees as a threat — even if it’s harmless to most people. Common triggers include:

  • Foods (like peanuts, tree nuts, eggs, milk, wheat, soy, fish or shellfish)
  • Medicines (like certain antibiotics)
  • Insect stings
  • Latex
  • Things in the air (like pollen, pet dander, mold or dust)

Mild symptoms you can monitor at home

A mild reaction can be uncomfortable, but it often improves with basic care. You might see:

  • Itchy skin
  • A few hives
  • Sneezing
  • Runny nose
  • Watery eyes
  • Mild swelling (like puffy eyelids)

If symptoms stay mild and your child is breathing normally and acting mostly like themselves, you can often keep a close eye on them and follow your healthcare provider’s guidance.

Red flags: Signs of a severe allergic reaction (anaphylaxis)

According to the American Academy of Allergy, Asthma and Immunology anaphylaxis requires immediate emergency treatment, including a prompt dose of epinephrine and a visit to the ER.

Here’s the key thing to remember: If breathing, swallowing or alertness is affected, treat it like an emergency.

Call 911 right away if you notice any of these:

  • Trouble breathing, shortness of breath or wheezing
  • Swelling of the lips, tongue, face or throat
  • Trouble swallowing, drooling or a tight feeling in the throat
  • Dizziness, fainting, confusion or your child seems very weak
  • Skin that looks pale or bluish
  • A fast heartbeat
  • Severe vomiting or diarrhea
    • Especially if it happens along with hives or breathing symptoms, it could be anaphylaxis

If a reaction seems severe, don’t wait it out. Emergency teams are ready 24/7 to treat allergic reactions and monitor for complications. If you use an epinephrine auto-injector (like an EpiPen), you should still call 911 or go to the ER. Even when epinephrine helps right away, symptoms can come back, and your child may need monitoring and more treatment.

What to do while you wait for help: A quick checklist

If you think your child (or anyone) is having a severe allergic reaction, call 911 right away. Then:

  • Use epinephrine immediately if you have it and symptoms suggest anaphylaxis (trouble breathing, throat tightness, fainting, widespread hives with other symptoms).
    • If you’re unsure and epinephrine is prescribed for them, use it.
  • Lay them flat on their back if they feel faint or weak.
    • Raise their legs if you can.
    • If vomiting or pregnant, turn them on their side.
  • Loosen tight clothing and keep them calm and still (moving around can make symptoms worse).
  • If they stop breathing or collapse, start CPR if you know how.
  • If symptoms don’t improve or come back and you have a second auto-injector, a second dose may be needed according to the device instructions and 911 guidance.
  • Do not drive yourself if symptoms are severe — wait for EMS when possible.
  • Do not give food or drink.
  • If they have asthma and are wheezing, use their rescue inhaler but don’t use it instead of epinephrine if this seems like anaphylaxis.
  • Bring the auto-injector (and the packaging, if available) to the ER so the care team knows what was used and when.

How to help prevent future reactions

If you know or suspect your child has an allergy:

  • Avoid triggers when you can
  • Read food and medication labels carefully
  • Keep prescribed medications available (including epinephrine, if prescribed)
  • Ask your child’s healthcare provider about an allergy action plan so you can be prepared