Which of the following is NOT a potential withdrawal symptom of opioids?

In the context of opioid withdrawal, each of the listed symptoms has a connection to the physiological responses experienced when an individual abruptly stops using opioids after prolonged use.

Sweating is commonly observed during withdrawal due to the body's heightened autonomic response as it adjusts to the absence of the drug. Anorexia, or loss of appetite, can also occur as part of the withdrawal syndrome as the individual’s body reacts to the absence of opioids, which often suppress appetite when used. A runny nose is another typical withdrawal symptom, often resembling symptoms of the flu, as the body begins to reacclimate without the presence of opioids.

Insomnia, while it can certainly occur in various contexts and is sometimes reported during withdrawal, is less commonly identified as a primary or defining symptom of opioid withdrawal compared to the other listed choices. Instead, individuals may experience sleep disturbances or altered sleep patterns, but this is not as prominently featured as the other symptoms in typical discussions of opioid withdrawal. This distinction helps clarify why insomnia is the answer that does not fit with the classic withdrawal symptoms associated with opioids.