Mood and Cognitive Disorders Following Hearing Loss: Impact of Hearing Aid Timing

<b>Background:</b> Hearing loss is one of the most common yet often overlooked sensory deficits worldwide, with consequences extending well beyond auditory function. Mounting evidence highlights the complex interrelationships among hearing loss, cognitive decline, and psychosocial well-being. Neural mechanisms underlying this association include increased cognitive load, cortical reorganisation, and social isolation, which mediate the impact of auditory deprivation on the brain and mental health. Furthermore, hearing impairment is consistently associated with a higher risk of depression and anxiety, particularly when the duration of untreated deafness is prolonged. <b>Methods:</b> This narrative review summarises recent longitudinal and neuroimaging studies investigating the effects of hearing loss and the timing of intervention with hearing aids. The review focuses on evidence addressing cognitive, psychological, and neural outcomes in relation to early versus delayed amplification. <b>Results:</b> Across multiple studies, early adoption of hearing aids within a limited timeframe after diagnosis is linked to better cognitive performance, lower depressive symptom scores, and more preserved neural network integrity. Experimental evidence supports the existence of sensitive periods for auditory intervention, during which brain plasticity allows for optimal reorganisation and recovery of function. Conversely, delayed amplification may lead to irreversible cortical changes and persistent psychosocial distress. Despite this, several barriers-healthcare accessibility, patient attitudes, and economic constraints-continue to delay timely intervention. <b>Conclusions:</b> Early identification and management of hearing loss are critical to preserve cognitive and emotional health. An integrated approach addressing both hearing and cognitive well-being, supported by patient education and personalised care strategies, may maximise the benefits of amplification and improve overall quality of life.