Coma A coma ( or comatose state ) is a state of unconsciousness in which a person is unresponsive to physical stimulation due to a reduction of neurological activity in the neocortex . A coma can be the result of many things including head trauma and Iresine Syndrome . ( ) In 1986 , following a fall onto a barge from the aircraft carrier Pavel Chekov ' s middle meningeal artery was torn . This internal injury placed Chekov into a coma . ( ) In 2152 , Jonathan Archer warned that he could lapse into a coma if he fell a sleep while suffering from heatstroke . Tucker thought going into a coma " " sounds nice " " . ( ) In 2153 , Phlox placed the crew of in a comatose state while the starship traversed a region of transdimensional space . This was done in order to dampen the crews ' brain activity , as the affected region would disrupt the neocortex of the Human brain . ( ) In 2154 Doctor Phlox held Corporal Askwith in a coma because of his cranial injuries he suffered from an explosion of a bomb in the United Earth Embassy on . ( ) " Comas could be induced to prevent an individual from waking up and causing destruction . In 2259 of the alternate reality , Doctor instructed his staff to keep an Augment in an induced coma and put a newly dead in the Augment ' s cryotube to preserve Kirk ' s brain functions . ( ) " In 2267 , the invalid Christopher Pike kept blinking " no " via his wheelchair . According to Leonard McCoy , upon being questioned to which question he answered no , Pike almost agitated himself into a coma . ( ) In 2268 , McCoy characterized John Gill ' s state as almost comatose . ( ) In 2285 , Torias Dax was in a fatal shuttle accident . He was said to have fallen in a six - month coma before dying , but in fact , he had died quickly , and had the Dax symbiont transferred to Joran Dax . ( ) In 2366 , Doctor Beverly Crusher induced coma in Deanna Troi to shield her from all outside stimuli as she was affected by the music planted into her mind by Kevin Uxbridge . ( ) In 2367 , a simulation of Crusher told Will Riker that a strain of Altarian encephalitis had resulted in his entering a ten - day bout of coma and delirium . ( ) In 2368 , several crewmembers of the , including Counselor Troi and Commander Riker fell into comas as a result of an invasive telepathic memory attack performed by Jev , a member of the visiting Ullian historian delegation . ( ) In 2369 , Zek , the Ferengi Grand Nagus , used Dolbargy sleeping trance , a voluntarily induced deep coma , to fake his own death when he wanted to test the readiness of his son , Krax , to serve as Nagus . Zek ' s servant , Maihar ' du , had taught him the technique . ( ) In 2371 , Julian Bashir was attacked by a Lethean named Altovar , who wanted to steal controlled medical equipment . Bashir was left in a coma , where he experienced a disturbing hallucination involving aging rapidly . ( ) In that same year , Neelix on the fell into a coma after he had his lung s removed by a Vidiian . ( ) In 2372 , Benjamin Sisko sustained severe trauma to the head as a result of a Jem ' Hadar attack . Kira Nerys attempted to prevent a coma by keeping him occupied with conversation . ( ) In 2373 , an accident left Jadzia Dax , Elim Garak , Odo and Benjamin Sisko in a coma . Residual morphogenic enzymes in Odo ' s brain created a telepathic link between the four , where they relived a disturbing memory of Odo ' s during the Occupation of Bajor . ( ) . In the same year , Kes fell into a coma and Captain Kathryn Janeway attempted to save her life by going through a Nechani ritual . ( ) In 2376 , Lieutenant B ' Elanna Torres was left in a coma , also caused by a shuttle accident . She experienced hallucinations relating to her Klingon heritage . She later re - created the conditions of the accident in order to return to the hallucination in an attempt to free her mother form Gre ' thor . ( )