Cognitive decline refers to a type of condition wherein a person experiences memory loss, slower or diminished thinking skills, or other impairments in mental capabilities. It is a reaction to the slower rate at which the brain functions due to the ageing of neurons. Environmental factors that are not conducive to a person's brain health can contribute to cognitive decline. This condition might range from dementia to mild cognitive impairment. Hearing loss is a partial or whole loss of hearing in one or both ears which can range from minor to profound. Its common causes include ageing, heredity, exposure to loud noise and illness. Hearing loss is independently linked to both incident cognitive impairment and accelerated cognitive decline in community-dwelling older adults. This book aims to understand the clinical perspectives of cognitive decline and hearing loss. It aims to shed light on some of the unexplored aspects of these medical conditions. This book will serve as a reference to a broad spectrum of readers.