The DSM-5-TR contains the most up-to-date criteria for diagnosing mental disorders.
In general, DSM-5 focuses on mental health conditions. The reason behind this is mental health and brain function are inseparable, also the DSM-5 includes all conditions and concerns related to how the brain works.
Hence, DSM-5 used to promote the idea that for most psychological disorders, the reason is genetic component, but there is also no known variant of gene in almost 97% of diagnoses. DSM-5 also maintain the chemical imbalance theory, that also refers that mental disorders are influenced by imbalance of chemicals in the brain.
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