Time sickness
Time sickness referred to any negative medical condition resulting from temporal displacement, temporal disruption, or time travel.

Types of time sickness included:

 * temporal psychosis, which affected people who used temporal transporters too frequently () 
 * temporal narcosis, caused by exposure to different time continuums such as those caused by temporal fragments ()
 * Af-Kelt, a condition unique to El-Aurians due to their temporal sensitivity ()
 * painful, and ultimately fatal physiological symptoms experienced by those rare individuals who travel across both time and dimensions, such as Yor of the alternate reality and Philippa Georgiou of the mirror universe.  

Medical conditions
Time travel