A Study in Teenagers and Adults With Hereditary Angioedema (HAE) Type I or Type II Who Use Lanadelumab as Long-Term Prophylaxis

The main aims of this study are to learn how many people with HAE Type I or Type II are attack-free when treated with lanadelumab in real life. This includes the number of people that are attack-free when lanadelumab is given every 2 and every 4 weeks. This study is about collecting existing data only; participants will not receive lanadelumab as part of this study. No new information will be collected during this study. Only data already available at the participant's doctor's office will be reviewed and collected for this study. Participants do not need to visit their doctor in addition to their normal visits.