Causes and Types of Angioedema Angioedema can result from allergic reactions, medication side effects, autoimmune responses, or genetic mutations. The causes and types of angioedema often determine whether the swelling is short-lived or chronic, and whether it responds to antihistamines. 1. Allergic (Histaminergic) Angioedema 2. Non-Allergic Drug-Induced Angioedema 3. Hereditary Angioedema (HAE) 4. Acquired Angioedema 5. Idiopathic Angioedema Understanding the underlying cause is essential for long-term management and preventing recurrence. 👉 [Next: Diagnosis of Angioedema] Understanding Idiopathic Pancreatitis Complications of Angioedema Complications of Angioedema Angioedema Overview