Study Links Diagnosed Voice Disorders to Higher Risk of Cognitive Decline

People with diagnosed voice disorders but no hearing loss had a 58% higher risk of later cognitive impairment or dementia than patients without voice or hearing problems, according to a large observational study from researchers at Drexel University’s College of Medicine.

The findings, published in the Journal of Voice, examined whether changes in vocal quality might be associated with cognitive decline. The study is described as the first large-scale analysis of diagnosed voice disorders and subsequent cognitive outcomes.

Researchers tracked medical data from 833,417 patients during primary care visits. Follow-up began at least one year after patients received a diagnosis involving a voice disorder or hearing loss. The researchers compared patients with diagnosed voice disorders or hearing loss with a control group that had neither condition, then assessed who later developed cognitive impairment or dementia.

Voice disorders included problems involving pitch, clarity, volume, vocal range or other aspects of the voice. The analysis found a stronger association between cognitive decline and voice disorders than between cognitive decline and hearing loss among patients without voice disorders.

Hearing loss was still associated with elevated risk: patients with hearing loss had a 27% higher risk of cognitive decline than matched controls. The study therefore did not contradict earlier research connecting hearing loss with dementia. Instead, its results suggest that voice disorders may provide an additional signal—and possibly a stronger one than hearing loss alone—in some patients.

The strongest association with dementia occurred among people who had both a voice disorder and hearing loss. That group was also older and had higher rates of health conditions including high blood pressure, heart disease and type 2 diabetes, according to the report.

Senior author Robert Sataloff said voice problems may reduce participation in social and other mentally engaging activities, although that explanation remains a proposed interpretation rather than a finding established by the study. The researchers also noted that voice disorders can precede other physical signs in patients with Parkinson’s disease, but the current analysis focused on cognitive impairment and dementia.

The findings are relevant to a sizable population: the report cites National Institutes of Health estimates that 17.9 million U.S. adults experience a voice problem in a 12-month period, including 9.4 million whose symptoms last at least a week. It also states that four in 10 adults with a voice disorder do not seek medical care.

The study does not show that voice disorders cause dementia, nor does it establish that treating a voice disorder would prevent or slow cognitive decline. The authors called for future research examining whether particular types of voice disorders are more strongly linked to cognitive outcomes and whether treatment changes that risk.