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Most appear to be caused by chemical imbalances in the brain of various neurotransmitters.
The most used method is chemical imbalances.
Depression is a mental illness caused by chemical imbalances in the brain, not a habit that develops over time.
Depression is caused by a variety of chemical imbalances in the brain. It makes people feel really, really sad.
Probably because of the chemical imbalances from being pregnant fluctuating to try and become normal again.