If you use tampons during your periods, make sure you change them at least every 4 to 8 hours to help prevent a rare but potentially fatal disease called toxic shock syndrome (TSS).
In addition, you should always use the lowest absorbency tampon necessary for the amount of menstrual flow you are experiencing on each day of your period. Using super-absorbency tampons on the lightest day of your period potentially puts you at risk for TSS. Those most at risk for TSS include women under thirty, particularly teenage girls.
Don't believe it if someone tells you that only certain types of tampons put you at risk for TSS. That just isn't true. It doesn't matter if the tampon is made of the purest cotton or of rayon -- all tampons could potentially put you at risk for toxic shock syndrome if not used properly.
Learn more about preventing TSS here: How To Reduce Your Risk Of Toxic Shock Syndrome
Menstruation and The Menstrual Cycle. NWHIC. http://www.womenshealth.gov/faq/menstruation.cfm. Accessed 12/16/09.