Inclusion Criteria:

- Provide written informed consent and be willing to comply with protocol requirements

- Participant is aged ≥ 18

- Have a documented (medical record) diagnosis of either pheochromocytoma or
paraganglioma with active symptoms or within 60 days of curative therapy

Exclusion Criteria:

Patient is currently asymptomatic from pheochromocytoma/paraganglioma diagnosis or
duration > 60 days from curative therapy

- Participant has a clinically significant disorder, including alcohol or drug abuse,
which may interfere with study participation or which may affect the outcome of the
study as judged by the investigator.

- Participant has a mental disability or significant mental illness, legal incapacity
or limited legal capacity or any other lack of fitness, in the investigator's
opinion, to preclude the subject's participation in or ability to complete the study.

- Participant is currently too unwell to take part in the study.