Despite unprecedented access to advanced imaging, electrophysiology, and laboratory diagnostics, a large proportion of diagnostic delays, misinterpretations, and preventable complications in neurology and neurosurgery still arise from failure at the bedside—the failure to recognize, interpret, and act upon physical signs in time. Subtle neurological markers are frequently overlooked, misunderstood, or undervalued, leading to inappropriate investigations, delayed treatment, misplaced reassurance, and avoidable harm that technology cannot correct once initial judgment has failed. This book exists to address that persistent gap by reaffirming the central role of clinical examination as the foundation of neurological diagnosis, long before scans confirm pathology. Volume 1 (A–G) presents more than 385 clinically relevant physical signs and markers arranged for real-world use across outpatient clinics, emergency departments, wards, intensive care units, operating rooms, and teaching settings. It equips clinicians to identify disease early, localize lesions accurately, differentiate major pathological processes, correlate signs with neuroanatomy, determine urgency, and teach examination with practical clarity. Designed for neurologists, neurosurgeons, emergency physicians, intensivists, internists, trainees, educators, and institutional libraries, this volume moves beyond memorization to emphasize interpretation, integration, and defensible clinical reasoning. In an era where overreliance on investigations risks weakening bedside skills, this textbook restores confidence in neurological examination and reinforces disciplined, thoughtful judgment as the cornerstone of safe and effective neurological care.