Coma

A coma is a deep state of prolonged unconsciousness in which a person cannot be awakened, fails to respond normally to painful stimuli, light, or sound, lacks a normal... Wikipedia

• Specialty:  Neurology, psychiatry
• Symptoms:  Unconsciousness
• Duration:  Can vary from a few days to several years (longest recorded is 42 years)
• Data source:  DuckDuckGo