What does the term 'Substance Withdrawal' refer to?

The term 'Substance Withdrawal' specifically refers to the physical symptoms that occur when an individual who has been using a substance reduces or stops its intake. These symptoms can manifest in various ways, depending on the substance involved and the duration of use, and may include anxiety, nausea, tremors, and seizures, among others. Withdrawal is a physiological response to the absence of a substance that the body has become dependent on. This condition underscores the nature of physical dependency, where the body adapts to the presence of the substance, requiring its continued use to function normally.

The other options touch on important aspects of substance use and dependency; however, they do not define withdrawal. Tolerance pertains to the body's need for progressively larger amounts of a substance to achieve the same effect. Psychological cravings involve an individual’s intense desire to use the substance, and behavioral changes can include alterations in mood, social interactions, or daily functioning due to substance use. These concepts are related to substance dependence but do not capture the specific phenomena associated with withdrawal.