Presbycusis

Presbycusis is a common condition that affects the hearing ability of older adults. It involves gradual hearing loss that occurs as people age, primarily affecting the inner ear and the nerves responsible for hearing. This condition makes it harder to hear high-pitched sounds and understand speech, especially in noisy environments. The auditory system is involved, and the loss typically happens slowly over many years. People with presbycusis may notice difficulty following conversations or hearing the doorbell. It is a natural part of aging but can significantly impact communication and quality of life.

Presbycusis is defined as age-related sensorineural hearing loss resulting from progressive degeneration of the cochlear hair cells, stria vascularis, and auditory nerve fibers. The primary mechanism involves cumulative damage from metabolic changes, oxidative stress, and noise exposure leading to loss of sensory cells and neural elements in the inner ear. It typically presents as bilateral, symmetrical, and high-frequency hearing loss that worsens over time. The condition is the most common cause of hearing impairment in the elderly and significantly affects speech discrimination and communication. Histopathology often shows atrophy of the cochlear structures and loss of spiral ganglion cells. It is distinguished from other causes of hearing loss by its gradual onset and association with aging.