Hereditary angioedema (HAE) is a rare genetic condition that causes swelling under the skin and lining of your gut and lungs. “Angio” means it affects your blood vessels. “Edema” means swelling. So ...

Hereditary hemorrhagic telangiectasia (HHT) can be fatal. However, it does not affect the average life expectancy of most people. Complications can occur when blood vessels rupture in vital organs.