Pulmonary hypertension (PH) is a diverse group of diseases that elevates pulmonary artery pressure. Globally, PH prevalence is approximately 1%. Pulmonary arterial hypertension incidence is 6 per million patients with a prevalence of 49–55 per million. This book dives into historical facts related to PH, clinical features, treatment, and specialized issues associated with PH. This book is a resource for health professionals such as nurses, medical students, allied health professionals, primary care physicians, pulmonary clinicians, and clinicians caring for patients with pulmonary hypertension.