Inclusion Criteria - Patients with Active Recurrent Pericarditis:

• Physician-confirmed (or confirmation in medical records) diagnosis of Recurrent Pericarditis (RP) defined as an initial acute, episode and at least one pericarditis recurrence after the initial acute episode.
• Experienced at least one pericarditis episode in the 3 years prior to inclusion.
• Under the care of a physician for the treatment and management of RP.
• Currently prescribed medication for RP.
• Able to read and understand English or Spanish.
• Have access to technology to complete ePROs.
• Provided informed consent or assent, as required by local regulations.

Inclusion Criteria - Patients with Inactive Recurrent Pericarditis:

• Physician-confirmed (or confirmation in medical records) diagnosis of RP defined as an initial, acute, episode and at least one pericarditis recurrence after the initial, acute episode.
• Patient had a last episode occurring at least 3 years and up to 5 years before registry inclusion.
• Resolution of RP symptoms confirmed with no further RP treatment for 3 years prior to registry enrollment.

Exclusion Criteria - Patients with Active Recurrent Pericarditis:

• Diagnosis of pericarditis secondary to tuberculosis (TB), cancer if not in full remission, post-thoracic blunt trauma (e.g., motor-vehicle accidents), myocarditis, systemic autoimmune diseases, except SJIA and adult Still’s disease, HIV.
• Appears to have an impairment (e.g., cognitive, hearing, visual) or insufficient English or Spanish proficiency that could interfere with ability to complete patient-completed assessments.
• Currently enrolled in a therapeutic investigational drug or device study.

Exclusion Criteria - Patients with Inactive Recurrent Pericarditis:

• Experienced a pericarditis episode within 3 years from enrolling in the registry.
• Currently receiving RP treatment prescribed by a treating physician (e.g., CS, colchicine).
• Diagnosis of pericarditis secondary to tuberculosis (TB), cancer if not in full remission, post-thoracic blunt trauma (e.g., motor-vehicle accidents), myocarditis, systemic autoimmune diseases except SJIA and adult Still’s disease, HIV.
• Enrolled in a therapeutic investigational clinical trial during the observation period.