Every year on 16 May, it marks International (HAE Day) – Hereditary Angioedema Day – which aims to raise awareness about this debilitating disease. Professor Mike Levin, CEO of the Allergy Foundation of South Africa (AFSA) and head of the division of Paediatric Allergology at UCT chats to Leigh-Anne Williams about what this illness is, the causes and symptoms as well as how people can get diagnosed and treated for this rare disease.