What is a common behavioral symptom of substance use disorders?

Increased tolerance to substances is a well-documented behavioral symptom of substance use disorders. Tolerance refers to the body's adaptation to the presence of a drug, which often leads to individuals needing larger amounts of the substance to achieve the desired effects. This symptom illustrates how the brain and body adjust to prolonged substance use, which can escalate the frequency and amount consumed, potentially leading to dependency.

The concept of tolerance is critical in understanding substance use disorders, as it highlights a significant change in an individual's relationship with the substance. Over time, as tolerance develops, the initial effects of the substance may diminish, prompting users to increase their consumption to experience the same level of impact. This behavior is indicative of the complex interactions between substance use, brain chemistry, and physical dependence.

On the contrary, decreased tolerance is often indicative of withdrawal or a reduction in substance use, which is not a common behavioral symptom of substance use disorders. Improved social interactions typically reflect positive growth or treatment success, rather than a symptom of a disorder. Optimum physical health is unlikely in the context of substance use disorders, as these conditions generally lead to various health complications.