What symptom should be reported immediately in a client who is being treated with lithium?

Blurred vision and nausea are critical symptoms that indicate potential lithium toxicity, which can occur if lithium levels in the body become too high. This situation necessitates immediate reporting to a healthcare provider, as it may lead to severe complications or disruptions in the patient's treatment plan.

Lithium is a medication commonly used to treat bipolar disorder, and while patients may experience some side effects as they adjust to the medication, symptoms like blurred vision and nausea could signify that the drug is affecting the body adversely. Prompt intervention is crucial to prevent further deterioration of the patient's health status, potentially through adjusting the dosage or reassessing the treatment regimen.

Other symptoms related to lithium treatment, such as increased thirst and weight gain, while they may warrant discussion during follow-ups, typically do not require immediate reporting unless accompanied by more severe issues. Lowered mood, while concerning, is a common aspect of the condition being treated and often needs careful monitoring rather than immediate intervention.