Mental illnesses, in general, are thought to be caused by a variety of genetic and environmental factors: Inherited traits. Mental illness is more common in people whose blood relatives also have a mental illness. Environmental exposures before birth. Exposure to environmental stressors, inflammatory conditions, toxins, alcohol or drugs while in the womb can sometimes be linked to mental illness. Brain chemistry. Neurotransmitters are naturally occurring brain chemicals that carry signals to other parts of your brain and body.
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