| Name | Description | 
  | Neural Metaphasic Shock [1] | A failure of the neurological system in Humanoids. Potentially fatal. [1] | 
  | Neurochemical Imbalance [2] | A serious condition which arises in Vulcans during Pon Farr. [2] | 
  | Neuroleptic Shock [3] | A neurological disturbance in which cortical functions of the brain's synaptic pathways are disrupted. This can result in a state similar to coma without the usual biochemical markers. [3] | 
  | Nitrogen Burn [4] | Damage to the skin caused by exposure to nitrogen at extremely low temperatures. In 2151 mild cases of nitrogen burn could be treated with dermoline gel. [4] |