What is it about?
Bipolar disorder is often reduced to mood swings, but the illness is far more complex. In this review, we explain how bipolar disorder may arise from the interaction of many biological systems rather than one single cause. We bring together findings from genetics, brain imaging, inflammation, stress biology, circadian rhythm research, and energy metabolism to show how these pieces may fit together. We also summarize current treatment approaches for mania, bipolar depression, mixed states, and long-term maintenance, while highlighting the major clinical challenge that many patients continue to have symptoms and functional impairment even between episodes.
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Why is it important?
This review is timely because it brings together fast-moving but fragmented research on the biology of bipolar disorder into a clinically useful framework. By linking genetics, circadian rhythms, mitochondrial function, calcium signaling, stress biology, inflammation, and brain networks, it offers a more integrated way to think about the illness and its treatment. We also introduce two conceptual models, the “desynchrony cascade” and the “Nexus” model, to show how these systems may interact. This could help guide better research, more personalized care, and a shift away from trial-and-error treatment.
Perspectives
This publication represents an effort to connect the science of bipolar disorder with the lived reality of patients. We wanted something that was broad enough to reflect the biology, but also practical enough to help clinicians and researchers think differently about diagnosis, treatment, and recovery. One of the central messages is that reducing symptoms is not enough; we also need to improve functioning, quality of life, and long-term outcomes.
MOHAMED SOLIMAN
Harvard University
Read the Original
This page is a summary of: Bipolar Disorder: An Update on Neurobiology and Treatment, American Journal of Psychiatry, March 2026, American Psychiatric Association,
DOI: 10.1176/appi.ajp.20260051.
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