Complex breathlessness (breathlessness with an unclear cause or that appears disproportionate to underlying causes) is an important and often neglected condition that presents a challenge to both patients and clinicians. This Monograph aims to provide clinicians at all levels with a comprehensive guide to complex breathlessness. Covering all aspects of this challenging clinical scenario, it will prove a useful resource when faced with a symptomatic breathless patient with no obvious underlying cause or with disproportionate symptoms. Several less commonly considered clinical entities and...