Dec. 26 (HealthDay News) -- Developmental problems involving a walnut-shaped part of the brain called the amygdala -- linked to fear, anxiety and other emotions -- may explain why mental illness and addiction often appear together, researchers say.
Many kinds of addiction -- such as those for alcohol, drugs and nicotine -- occur in people with various kinds of mental illness, including depression, schizophrenia and anxiety disorders, according to background information in an American Psychological Association news release about the Indiana University study.
