Peanut allergy symptoms and signs

The most important step in the diagnosis of peanut allergy is a detailed history. A good history may essentially make the diagnosis of a peanut allergy. Important factors for a suggestive history of peanut allergy include the following:

Timing of symptoms: The majority of reactions occur within 20 minutes, with nearly all reactions occurring within two hours of exposure to peanuts.
Types of peanut allergy symptoms: About 80% to 90% of reactions involve skin manifestations such as

• a rash, including hives,
• redness,
• itching.

Nevertheless, reactions can occur in the absence of a rash, and these reactions may be the most severe. Other common signs and symptoms involve the

• respiratory system (difficulty breathing, coughing, wheezing),
• gastrointestinal system (nausea, vomiting, diarrhea),
• cardiovascular system (increased heart rate, decreased blood pressure),
• neurological system (lightheadedness, passing out),
• even changes in behavior, especially in children.