|A patient in catatonic stupor|
Stupor is the lack of critical mental function and a level of consciousness, in which an affected person is almost entirely unresponsive and responds only to intense stimuli such as pain. The word derives from the Latin stupor ("numbness, insensibility").
Signs and symptoms
Stupor is characterised by impaired reaction to external stimuli. Those in a stuporous state are rigid, mute and only appear to be conscious, as the eyes are open and follow surrounding objects. If not stimulated externally, a patient with stupor will appear to be in a sleepy state most of the time. In some extreme cases of severe depressive disorders the patient can become motionless, lose their appetite and become mute. Short periods of restricted responsivity can be achieved by intense stimulation (e.g. pain, bright light, loud noise, shock).
Stupor is associated with infectious diseases, complicated toxic states (e.g. heavy metals), severe hypothermia, mental illnesses (e.g. schizophrenia, major depressive disorder), epilepsy, vascular illnesses (e.g. hypertensive encephalopathy), acute stress reaction, neoplasms (e.g. brain tumors), B12 deficiency affects mental abilities, major trauma, vitamin D excess and other maladies.
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