Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) hereditary angioedema ?
    ### Response:
    Hereditary angioedema is a disorder characterized by recurrent episodes of severe swelling (angioedema). The most common areas of the body to develop swelling are the limbs, face, intestinal tract, and airway. Minor trauma or stress may trigger an attack, but swelling often occurs without a known trigger.
    