What causes depression and schizophrenia?
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The live hypotheses side by side, from chemical imbalance to inflammation, the gut and social defeat, and why none of them has won yet.
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Hypothesis
The Serotonin Hypothesis of Depression

Hypothesis
The Inflammatory Hypothesis of Depression

Hypothesis
The Gut-Brain Axis

Theory
The Gut-Brain Axis: Microbiome Influence on Mental Health

Hypothesis
Social Media Use and Adolescent Depression: Causal Relationship Under Investigation

Hypothesis
The Dopamine Hypothesis of Schizophrenia

Hypothesis
The Glutamate Hypothesis of Schizophrenia

Hypothesis
The Social Defeat Hypothesis of Psychosis

Contested
Nature versus Nurture

Proven
The Blood-Brain Barrier

Hypothesis
The Glymphatic System
Most of these cards are hypotheses. Each explains part of the picture; the likeliest answer is that several causes act together.
Question
Why do treatments that work for some people do nothing for others?