Which of the following is a sign of alcohol withdrawal?

Shaking, or tremors, is a well-documented sign of alcohol withdrawal. This symptom occurs because the central nervous system, having become dependent on the presence of alcohol, reacts negatively when it suddenly finds itself without it. The abrupt cessation of alcohol intake can lead to overactivity of the nervous system, resulting in physical manifestations such as tremors or shaking.

Other symptoms of alcohol withdrawal include anxiety, agitation, sweating, and an increased heart rate, which further illustrate the body's struggle to readjust to the absence of alcohol. Recognizing these signs is crucial in a clinical setting, as they can guide healthcare professionals in providing appropriate care and intervention for individuals experiencing withdrawal.

While nausea and vomiting, and loss of appetite can also occur during withdrawal, they are not as distinctive or characteristic as shaking. Stability in mood is particularly contradictory to the typical emotional instability often seen in those going through alcohol withdrawal, making it an unlikely indication of withdrawal. Hence, shaking is the hallmark sign that best represents alcohol withdrawal.