Types of Angioedema
Angioedema can be characterized as :
This is an immune reaction to an allergen. Symptoms may appear within the first 2 hours after exposure to the allergen and usually settle within 3 days. Urticaria is usually present but not always.
This type of angioedema is associated with certain types of autoimmune diseases, infections, malignant tumors and diseases causing increased lymphocyte populations. It tends to occur later in life, usually after the fourth decade, and may persist as long as the underlying disease is present (chronic in nature). Urticaria may be present.
This is inherited type of angioedema and the symptoms usually present before the age of 20 years. It typically occurs in episodes, which can be quite severe and affect multiple systems simultaneously.
Drug Induced Angioedema
This is a non-allergenic type of angioedema and occurs within days or weeks (sometimes longer) after starting a certain type of medication. Urticaria is not present.
Symptoms are similar to acute allergic angioedema.