AP Psychology 2026 Practice Test – Biological Bases of Behavior

When a person reduces or stops heavy substance use, they may experience substance withdrawal. This phenomenon occurs because their body has adapted to the presence of the substance, leading to physiological and psychological changes. When the substance is suddenly removed, the body reacts negatively, resulting in various symptoms that can include anxiety, irritability, nausea, sweating, and tremors. These symptoms are the body's way of signaling that it is struggling to adjust to the absence of the substance it has become reliant on for normal functioning.

Recognizing withdrawal is crucial in understanding substance use disorders, as it can underscore the challenges individuals face when attempting to cease use. The severity and type of withdrawal symptoms can vary greatly depending on the substance involved, the duration of use, and individual factors. With this understanding, effective treatment plans can be developed to support individuals through this critical phase of recovery.