What is the condition that affects a significant percentage of the adult population and is often undiagnosed?

Depression is a mental health condition that affects a substantial portion of the adult population, with estimates suggesting that it impacts millions of individuals worldwide. One of the defining features of depression is that it can often go undiagnosed. Many adults may experience symptoms such as persistent sadness, loss of interest in activities, or changes in appetite and sleep patterns, yet they may not seek help due to stigma, lack of awareness, or the normalization of their feelings as part of aging or stressful life circumstances.

Given that the symptoms can be insidious and vary widely from person to person, individuals might not recognize what they're experiencing as a mental health issue. This can lead to prolonged suffering and a decreased quality of life. Additionally, certain populations may be less likely to report their symptoms or have limited access to mental health resources, further contributing to the likelihood of undiagnosed depression.

While other conditions such as anxiety, ADHD, and narcolepsy also affect many people and can be underdiagnosed, the prevalence and complexity of depression, combined with its diverse presentation, make it particularly noteworthy in discussions about mental health diagnoses in adults.