Yes, untreated hearing loss can have a significant impact on mental health. Studies have shown that people with hearing loss are more likely to suffer from depression, anxiety, and social isolation. Additionally, untreated hearing loss can lead to cognitive decline as the brain is not receiving the full range of sound it needs to process information. This can lead to difficulty concentrating, memory problems and difficulty understanding conversations. Finally, untreated hearing loss can lead to feelings of frustration and anger.