A single depression diagnosis can hide very different brain states. Researchers have identified five distinct brain activity profiles among people who all meet the criteria for depression, according to a report from Medical Xpress. The finding helps explain why two patients with the same diagnosis can have considerably different symptoms, treatment responses, and outcomes.
The study's context is significant. The World Health Organization estimates that depression affects roughly 332 million adults—about 5.2% of the global population. In Finland, where the research appears to be based, depression is the most common single cause of both prolonged illness-related absences and disability pensions.
Because the source is a single news report, the details of how the five profiles were defined and how they might guide treatment are not yet fully described. Still, the core implication is clear: treating depression as one uniform condition may be less useful than recognizing its biological diversity.