Addiction Changes Brain Biology in 3 Stages, Experts Say

Experts who research addiction have long argued that it is a disease of the brain. Now, in a new paper, they present a model of addiction, broken down into three key stages, to illustrate how the condition changes human neurobiology. Understanding what's going on in the brain of someone with an addiction is essential for medical professionals to better treat people with this disease, said Dr. Nora Volkow, director of the National Institute on Drug Abuse and the lead author of the new review.