Stupor is a state marked by near unconsciousness, lethargy, sluggish movements or immobility, and a weakened response to stimulation. A person in a stupor may appear to be unconscious unless they are constantly and repeatedly stimulated.

For example, someone who is in a 'drunken stupor' may appear to be passing out, is unresponsive to people talking to them, appears sleepy, and has slow clumsy movements. A catatonic stupor, a symptom of catatonic states, is marked by immobility, no loss of consciousness, a lack of response from stimuli, and frequently the inability to talk. A stupor can be the result a toxic state such as drunkenness, infectious disease, severe, hypothermia, epilepsy, emotional shock and many other medical conditions.

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