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 to painful stimuli or have defensive reactions such as limb withdrawal. 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. Urinary and fecal incontinence or urinary retention may be present. The main treatment is to treat the primary disease while preventing the progression to deep coma. Clinically, coma is generally divided into three degrees: superficial coma, moderate coma, and deep coma. Shallow coma means that strong stimuli can be responded to, there can be less unconscious activity, abdominal wall radiation disappears, but corneal radiation, light reflex, cough reflex and gag reflex, tendon reflex exist. Inhibition is at the cortical level. The causes of shallow coma are twofold: 1, shallow coma caused by brain lesions which include cerebrovascular diseases (such as cerebral hemorrhage, cerebral infarction, etc.), traumatic brain injury, brain tumor, encephalitis, toxic encephalopathy, etc. 2, shallow coma caused by systemic disorders. 2, shallow coma caused by systemic disorders: including alcoholism, diabetic acidosis, pesticide poisoning, uremia, hepatic coma, carbon monoxide poisoning, etc.