system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] - Why do you die if you can't complete the Pon Farr?
gpt
Severe neuro-chemical imbalance.  The Vulcan's strict psychological control applies all the way down to the chemical level, where particularly gifted priests and philosophers can actively change their neurochemistry to improve their focus and emotional control.  Unfortunately, the Vulcan body is still humanoid and this comes at a price - every now and then these chemical levels must be reset (by mating, or through an act of extreme physical violence) and the cycle begins anew.  Left unchecked symptoms quickly escalate from a loss of emotional control to completely unfettered primal rage and then eventually to death.  Medical therapies have not been extensively explored as this is something deeply private, personal and embarrassing to Vulcans, to the point that they rarely even discuss it amongst themselves/families.