What is the primary symptom of Akathisia?

Akathisia is characterized primarily by an overwhelming sense of inner restlessness that compels individuals to be in constant motion. This symptom often manifests as an inability to stay still, leading to excessive movements such as pacing, shifting one's weight from one leg to another, or fidgeting. The inner agitation is distinct and can be distressing for those experiencing it, making it a hallmark feature of the disorder.

In contrast, other symptoms listed do not align with the definition of akathisia. Repetitive movements of the face are more commonly associated with disorders like tardive dyskinesia. Extreme rigidity is typically a symptom found in conditions such as Parkinson’s disease or severe forms of catatonia. Loss of premorbid functioning refers to the decline in baseline levels of functioning prior to the onset of a disorder, which is more relevant to various severe mental health conditions, rather than specifically indicative of akathisia. Understanding these differences helps clarify why excessive movements due to inner restlessness serves as the primary symptom of akathisia.