John Lewis develops elevated blood pressure, diaphoresis, and tremors after being admitted to the psychiatric unit. What is the most likely cause of these symptoms?

The presence of elevated blood pressure, diaphoresis (excessive sweating), and tremors in this context suggests a physiological response to a state of withdrawal. In particular, withdrawal from benzodiazepines is characterized by similar symptoms due to the body's dependence on the medication. When benzodiazepines are suddenly reduced or stopped after chronic use, the central nervous system can become hyperactive because the calming effects that the medication provided are no longer present. This hyperactivity can result in autonomic symptoms such as increased blood pressure and sweating, as well as physical symptoms like tremors.

While alcohol dependence might also lead to similar withdrawal symptoms, the description and context of the symptoms suggest a likelihood of benzodiazepine withdrawal over alcohol withdrawal in a psychiatric setting, especially if the patient had been on long-term benzodiazepine therapy. Generalized Anxiety Disorder and delirium do not typically cause such a combination of physiological withdrawal symptoms immediately after admission, making them less likely causes. Understanding withdrawal syndromes is crucial in psychiatric practice to provide the appropriate interventions and management strategies.