Number of on-treatment participant-reported HAE attacks based on anatomical (peripheral, abdominal, laryngeal) location will be assessed.

Proportion of HAE attacks for which participants use on-demand therapy will be assessed.

Time to first HAE attack for which on-demand therapy is used will be assessed.

Proportion of HAE Attacks requiring visit to HCP, access to an ER, or hospitalization will be assessed.

The AE-QoL is developed to measure participant-reported health-related quality of life (HRQoL) impairment in participants with recurrent angioedema. It is a self-administered participant related outcome (PRO) with a recall period of 4 weeks. There are 17 items across 4 domains: functioning (4 items), fatigue/mood (5 items), fears/shame (6 items), and food (2 items). Responses use a 5-point Likert scale ranging from 'never' to 'very often.' Global scores range from 0 to 100 and scores by domains range from 0 to 100, where 0 indicates highest quality of life and 100 lowest quality of life.

Participant reported fatigue will be measured by the FSS. The FSS is a 9-item questionnaire measuring participants fatigue severity and its impact on motivation, exercise, physical functioning, and work and social life. It uses a 7-point Likert scale response (1 = strongly disagree, 7 = strongly agree) and the final score is obtained as mean of the response scores to the individual questions.

The HADS is a self-rating scale developed to detect the levels of depression and anxiety experienced by participants. It is a self-administered PRO composed of 14 items, of which seven relate to anxiety and seven relate to depression. Each item on the questionnaire is scored from 0 to 3, which means that a person can score between 0 and 21 for either anxiety or depression. Recommended cut-off scores are 8 to 10 for doubtful cases and greater than or equal to (> or =) 11 for definite cases.

The TSQM is a generic questionnaire to measure participants satisfaction with medication using yes/no and 5- or 7-point Likert scale response options. It is a self-administered PRO instrument designed for adults aged 18 years or older with a recall period of two to three weeks, or since the last medication use. Version TSQM-9 includes three domains: effectiveness (three items), convenience (three items), and global satisfaction scale (three items).

The WPAI:GH is a generic questionnaire to measure the effect of general health and symptom severity on work productivity and regular activities during the past seven days. It can be self or interviewer-administered to adults aged 18 years or older. This six-item PRO instrument covers work (five items) and daily activities (one item) using yes/no or numerical answers (number of hours).

The AC-QoL is a 40-item tool that measures the overall QoL for adult carers, and subscale scores for eight domains of QoL: support for caring, caring choice, caring stress, money matters; personal growth; sense of value, ability to care, and carer satisfaction. It is self-administered to adult carers and should take no longer than 10 minutes to complete. Scores range from 0 to 120, with higher scores indicating greater QoL.

Dose of lanadelumab used during the study will be assessed.

Frequency of lanadelumab injections during the study will be assessed.

Adherence is defined as the proportion of time on treatment over the study observation time period, times the proportion of actual lanadelumab doses taken per label as reported by participants through an administration diary over the total expected lanadelumab doses per label during the treatment period.

Frequency of use of approved lanadelumab dosing regimens will be assessed.

Frequency of administration modalities of lanadelumab (self-administration versus (vs). administration by a caregiver, HCP, or other) will be assessed.

Number of administrations of lanadelumab before participant discontinuation from the study will be assessed.

Frequency of reasons for discontinuation of treatment with lanadelumab reported by participants will be assessed.

An AE can be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (study) product whether or not related to the medicinal product. AE incidence, type, seriousness and relatedness to lanadelumab treatment will be assessed.

Severity of AEs is determined by using the following definitions: Mild: A type of AE that is usually transient and may require only minimal treatment or therapeutic intervention, the event does not generally interfere with activities of daily living. Moderate: A type of AE that is usually alleviated with specific therapeutic intervention, the event interferes with usual activities of daily living, causing discomfort, but poses no significant or permanent risk of harm to the research participant. Severe: A type of AE that interrupts usual activities of daily living (ADL), or significantly affects clinical status, or may require intensive therapeutic intervention. Severity of non-serious AEs will be assessed.