Akathisia: Distinction from Anxiety

Anxiety can involve worry, fear, bodily arousal and restlessness. Akathisia is more specifically associated with an urge to move and difficulty remaining still, often in relation to medication exposure. The conditions can coexist, and the distress caused by akathisia may itself produce anxiety.

Akathisia is a movement-related adverse effect characterised by distressing inner restlessness and often a need to move. Antipsychotics and some other medicines can cause it. It is not simply ordinary anxiety or voluntary fidgeting, and the subjective discomfort can be severe even when visible movement appears relatively mild to an observer.

Assessment asks what comes first, whether movement provides temporary relief and whether the experience followed a treatment change. Other possibilities include restless legs syndrome, pain, withdrawal and agitation during illness. No single description settles every case. Misidentification matters because a medication increase intended to treat agitation can worsen akathisia. Listening to the person’s account and reviewing the chronology can prevent this cycle. The goal is an accurate explanation that leads to appropriate care, rather than assigning all uncomfortable arousal to either psychological distress or a drug effect without investigation.

Restless legs syndrome typically has a particular relationship to rest, evening timing and leg sensations, while akathisia may involve a broader need to move. Anxiety may centre on feared events or worry. These patterns guide questions but are not self-diagnostic rules. A careful history and examination are needed, especially when more than one cause of restlessness may be present.

Further reading: DailyMed prescribing information (1); DailyMed prescribing information (2); Research record 2877708.