Allergy Symptoms

Medically Reviewed by Nayana Ambardekar, MD on June 17, 2020

Allergy symptoms can be categorized as mild, moderate, or severe.

Mild Allergy Symptoms

Mild allergy symptoms can include:

Mild allergic reactions do not spread to other parts of the body.

Moderate Allergy Symptoms

Moderate allergic reactions can include symptoms that spread to other parts of the body, including:

  • Widespread itching
  • Difficulty breathing

Severe Allergy Symptoms (Anaphylaxis)

Anaphylaxis is a rare, life-threatening emergency in which the response to the allergen is sudden and affects the whole body. Allergy symptoms may within minutes progress to more serious symptoms, including:

Show Sources


Asthma and Allergy Foundation of America. 

National Institutes of Health. 

American Academy of Allergy Asthma and Immunology.

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