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  1. Allergies - Symptoms and causes - Mayo Clinic

    Aug 24, 2024 · Allergy symptoms can range from mild to severe, even life-threatening. Find out what treatments and prevention tips can help.

  2. Anaphylaxis - Symptoms & causes - Mayo Clinic

    Apr 16, 2025 · Anaphylaxis, a severe allergic reaction, is an emergency. Learn who's at risk, what to watch for and what to do when it occurs.

  3. Allergies - Diagnosis and treatment - Mayo Clinic

    Aug 24, 2024 · Allergy symptoms can range from mild to severe, even life-threatening. Find out what treatments and prevention tips can help.

  4. Food allergy - Symptoms and causes - Mayo Clinic

    Aug 30, 2024 · For people with food allergies, symptoms can range from annoying to life-threatening. Learn about diagnosis and treatment of this common immune reaction.

  5. Penicillin allergy - Symptoms & causes - Mayo Clinic

    Sep 20, 2025 · It's important to understand and discuss what is an allergic reaction, what is a typical side effect and what you can tolerate in taking a medicine. Call 911 or emergency …

  6. Symptoms and causes - Mayo Clinic

    Symptoms of a serious drug allergy often happen within an hour after taking a medicine. Other reactions, particularly rashes, can happen hours, days or weeks later.

  7. Drug allergy - Diagnosis and treatment - Mayo Clinic

    Nov 9, 2024 · Learn which medicines are more likely to cause an allergic reaction, what symptoms look like and what treatments can calm such a reaction.

  8. Pet allergy - Symptoms & causes - Mayo Clinic

    Sep 5, 2025 · Family pet making you sneeze? Find out about diagnosis, treatment and handy household tips for relieving bothersome pet allergy symptoms.

  9. Monosodium glutamate, also called MSG: Is it harmful? - Mayo Clinic

    This flavor enhancer often added to foods can cause headache and other symptoms in some people.

  10. Allergy medications: Know your options - Mayo Clinic

    Mar 28, 2025 · Side effects might include irritation at the injection site and allergy symptoms such as, sneezing, congestion, hives, and itchy or watery eyes. Rarely, allergy shots can cause …