+**Addiction** is a chronic, relapsing brain disease characterized by compulsive drug seeking and use, despite harmful consequences. It represents a profound shift in [Brain Function](/wiki/brain_function) where the pursuit of a substance or behavior dominates, overriding natural [Reward](/wiki/reward) systems.
+## See also
+- [Substance Abuse](/wiki/substance_abuse)
+- [Dependence](/wiki/dependence)
+- [Withdrawal](/wiki/withdrawal)