by Anne Marie Helmenstine, Ph.D. Updated June 13, 2014. Definition: A molecular orbital is an orbital or wavefunction of a molecule's electron. Electrons around a molecule can be associated with more than one atom and are often expressed as a combination of atomic orbitals.
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.
Itâs a rare genetic condition that causes swelling under the skin. It can happen in different parts of your body. You are born with hereditary angioedema (HAE). Although youâll always have it, treatment helps you manage it. There have been big improvements in therapies, and researchers continue to look for new solutions. Symptoms usually show up in childhood and get worse during the teen years.