Shallow coma (subcoma) means that the patient loses most of his consciousness, has no voluntary movements, does not respond to sound and light stimuli, and may still show painful expressions or defensive responses such as limb withdrawal to painful stimuli. Corneal reflex, pupil-to-light reflex, eye movements, and swallowing reflex may be present. There is no significant change in respiration, blood pressure and pulse, and there may be urinary and fecal incontinence or urinary retention. The main treatment is to treat the primary disease while preventing the progression to deep coma. Superficial coma is seen in various febrile diseases and poisoning, etc., which develop to a certain extent with delirium tremens and coma. Among the febrile diseases related to the brain are encephalitis, encephalomyelitis, rabies, etc.; pneumonia and intestinal typhoid, which cause unconsciousness due to high fever; tetanus, which causes unconsciousness after convulsions, etc. Poisoning, severe diabetes mellitus, severe liver disease, uremia with renal insufficiency, severe emphysema and pulmonary fibrosis, etc. caused by the accumulation of metabolites in the body of toxic unconsciousness. Poisoning by alcohol, carbon monoxide, hypnotics, and recent photochemical fumes are also causes of confusion; loss of consciousness immediately after trauma, but after days to weeks due to subdural hematoma, is easily misdiagnosed and requires special attention. In children with diarrhea and vomiting, acetonemia and toxic bacillary dysentery can cause confusion.