Frequent question: When should you go to the emergency room for an allergic reaction?

An allergic reaction becomes more serious and is considered a medical emergency when any of the signs or symptoms are particularly severe, such as loss of consciousness or difficulty breathing, or if different parts or systems of the body are involved, such as having the combination of hives and vomiting, Dr.

Do allergic reactions require emergency help immediately?

Severe allergic reactions (anaphylaxis) and asthma attacks need emergency first aid. If your doctor says you are at risk of a severe allergic reaction, be sure to carry a device to inject adrenaline (such as an EpiPen® or Anapen®) and a mobile phone to call for help.

How do you know if an allergic reaction is serious?

Severe allergic reactions can cause:

  1. trouble breathing.
  2. throat tightness or feeling like the throat or airways are closing.
  3. hoarseness or trouble speaking.
  4. wheezing or cough.
  5. nasal stuffiness.
  6. nausea, belly pain, vomiting, and/or diarrhea.
  7. trouble swallowing or drooling.
  8. low blood pressure.
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What does ER do for allergic reaction?

Once you’re at the ER, A medical professional at Complete Care can see patients within minutes to treat a reaction. Depending on the severity of the reaction, some patients may require additional adrenaline doses or other types of treatment to help restore oxygen or open breathing airways.

What are three signs of a severe allergic reaction?


  • Skin reactions, including hives and itching and flushed or pale skin.
  • Low blood pressure (hypotension)
  • Constriction of the airways and a swollen tongue or throat, which can cause wheezing and trouble breathing.
  • A weak and rapid pulse.
  • Nausea, vomiting or diarrhea.
  • Dizziness or fainting.

Can anaphylaxis happen slowly?

The symptoms of anaphylaxis can vary. In some people, the reaction begins very slowly, but in most the symptoms appear rapidly and abruptly. The most severe and life-threatening symptoms are difficulty breathing and loss of consciousness.

What is mild anaphylaxis?

Anaphylaxis symptoms occur suddenly and can progress quickly. The early symptoms may be mild, such as a runny nose, a skin rash or a “strange feeling.” These symptoms can quickly lead to more serious problems, including: Trouble breathing. Hives or swelling. Tightness of the throat.

When should you go to the hospital for hives?

Other reasons to go to the emergency department include the following: Your hives or swelling do not improve after two to three days. You continue getting new hives after two days. Your symptoms do not get better with the treatment recommended by a health care professional.

Does Benadryl help with allergic reactions?

An antihistamine pill, such as diphenhydramine (Benadryl), isn’t sufficient to treat anaphylaxis. These medications can help relieve allergy symptoms, but work too slowly in a severe reaction.

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What 6 things should you look for to identify an allergic reaction?

Common symptoms of an allergic reaction include:

  • sneezing and an itchy, runny or blocked nose (allergic rhinitis)
  • itchy, red, watering eyes (conjunctivitis)
  • wheezing, chest tightness, shortness of breath and a cough.
  • a raised, itchy, red rash (hives)
  • swollen lips, tongue, eyes or face.

Is an allergic reaction considered an emergency?

Severe allergic reactions can potentially be life-threatening, and therefore should be treated at an emergency room. Anaphylaxis is the most common severe allergic reaction. It comes on quickly and can be life-threatening.

How long do severe allergic reactions last?

You usually don’t get a reaction right away. It can take anywhere from a few hours to 10 days. Typically, it takes from 12 hours to 3 days. Even with treatment, symptoms can last 2 to 4 weeks.

What are the cardiac signs or symptoms in anaphylaxis?

Signs of anaphylaxis

tachycardia, weak/absent carotid pulse. hypotension that is sustained and with no improvement without specific treatment (Note: in infants and young children limpness and pallor are signs of hypotension) loss of consciousness with no improvement once supine or in head-down position.

How can you tell the difference between an allergic reaction and anaphylaxis?

Key points to remember

Allergic reactions are common in children. Most reactions are mild. A severe allergic reaction (i.e. anaphylaxis) involves a person’s breathing and/or circulation. Anaphylaxis is the most severe form of an allergic reaction and is life threatening.