Allergy Symptoms

Medically Reviewed by Nayana Ambardekar, MD on August 07, 2022
Written by WebMD Editorial Contributors
1 min read

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

Mild allergy symptoms can include:

  • Rash
  • Localized itching
  • Congestion

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

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

  • Widespread itching
  • Difficulty breathing

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:

  • Itching of eyes or face
  • Varying degrees of swelling of the mouth, throat, and tongue that can make breathing and swallowing difficult
  • Hives
  • Abdominal pain
  • Cramps
  • Vomiting
  • Diarrhea
  • Mental confusion or dizziness