Brain chemistry involves the complex chemical environment and processes within the brain, particularly how neurotransmitters, hormones, and other signaling molecules facilitate communication between nerve cells to influence thoughts, emotions, and behavior. Key chemicals like dopamine, serotonin, oxytocin, and endorphins regulate everything from pleasure and mood to social bonding and pain response. While imbalances in brain chemistry are linked to neurological conditions, the “chemical imbalance theory” for mental health conditions is complex and requires further nuance, as many factors influence brain function.Â