Stupor represents an important loss in cognitive functions. The word derives from the Latin "stupure," meaning insensible. Being characterised by impairments of reactions to external stimuli, it usually appears in infectious diseases, complicated toxic states, mental illnesses (for example schizophrenia), vascular illnesses (for example hypertensive encephalopathy), neoplasms (for example brain tumors), and so on. Symptoms If not stimulated externally, a patient with Stupor will be in a sleepy m… (More on Stupor)