This study is a survey in Japan of Lanadelumab used to treat people with hereditary angioedema (HAE). The study sponsor will not be involved in how the participants are treated but will provide instructions on how the clinics will record what happens during the study. The main aim of the study is to check for side effects related from Lanadelumab and to check if Lanadelumab improves symptoms of HAE. During the study, participants with HAE will take Lanadelumab subcutaneous injection according to their clinic's standard practice. The study doctors will check for side effects from Lanadelumab for 12 months.