TSS happens when a certain kind of bacteria overgrows and produces toxins that poison your body. Young women may be at higher risk than older women - more than a third of all TSS cases have been in girls under age 19. When TSS strikes, it usually causes sudden, severe symptoms. TSS can easily kill you if left untreated. Change your tampon frequently.
Alternate tampon use with pads.
Overnight, try to use pads instead of tampons. Use the lowest absorbency tampon that is sufficient for your flow - the higher the absorbency, the higher the risk. Never use tampons when you aren't having your period. If you are just starting to use tampons, start slow - choose a very low absorbency and use them only for short periods of time. Always remember to remove the last tampon you use at the end of your period.