Allergic reactions can range in severity and duration, and may last anywhere from a few minutes to several weeks. The most common type of allergic reaction is an immediate reaction, which usually occurs within minutes of exposure to an allergen. Immediate reactions typically involve hives, itchy skin, or swelling and can be treated with antihistamines, corticosteroids, or epinephrine.
Mild Allergic Reactions
Mild allergic reactions can last from a few hours to a few days and may include runny nose, sneezing, itchy eyes, and skin rash. These reactions can be treated with over-the-counter antihistamines.
Moderate Allergic Reactions
Moderate allergic reactions can last for several days and may include symptoms such as difficulty breathing, wheezing, and swelling of the face, lips, or tongue. These reactions can be treated with prescription antihistamines or corticosteroids.
Severe Allergic Reactions
Severe allergic reactions, also known as anaphylaxis, can be life-threatening and may last for several days or weeks. Symptoms include difficulty breathing, swelling of the throat, and a drop in blood pressure. Anaphylaxis requires immediate medical attention and may be treated with epinephrine and a round of corticosteroids.