Which is NOT a symptom of opiate withdrawal?

Opiate withdrawal symptoms are primarily characterized by physical and psychological distress that occurs when a person who has been using opiates suddenly reduces or stops their intake. Common symptoms include vomiting, piloerection (which is the body's response to anxiety or cold, often referred to as "goosebumps"), and insomnia, all of which are typical indicators of withdrawal.

Euphoria, on the other hand, is not a symptom of opiate withdrawal. Instead, it is a positive effect associated with the use of opiates when the drug is active in the system. During withdrawal, individuals typically experience negative feelings and discomfort rather than feelings of euphoria. Thus, recognizing euphoria as a symptom in the context of withdrawal highlights the significant differences between the effects of opiate use and the experience of withdrawal, where the absence of the drug leads to distressing symptoms rather than pleasurable sensations.