Hereditary and acquired angioedema are like angioedema caused by an allergic reaction, but they don't itch and you don't get hives (red, itchy, raised patches on the skin).
Hereditary angioedema is genetic (a trait inherited from a parent). The condition is present at birth, but symptoms usually start when you’re a child or teenager.
Acquired angioedema can develop after you get certain cancers or autoimmune diseases (a disease that causes your body's immune system to attack its own tissues). Symptoms usually start later in life.
Doctors treat you with:
Doctors may also give you medicines to prevent swelling, particularly before known triggers.
If your airway swells and you have problems breathing, doctors will need to open your airway. To do this, they may: