Toxic shock syndrome is a sudden, potentially fatal condition. It’s caused by the release of poisonous substances from an overgrowth of bacteria called Staphylococcus aureus, or staph, which is found in many women’s bodies. Toxic shock syndrome affects menstruating women, especially those who use super-absorbent tampons. The body responds with a sharp drop in blood pressure that deprives organs of oxygen and can lead to death. People who die from toxic shock are killed by the body’s response to the poisons released by staph bacteria. Most people suffer hypotensive shock, in which the heart and lungs stop working.

If you are menstruating and have a high fever with vomiting, especially if you have been using tampons, you must get medical help right away. If you are using a tampon, menstrual sponge, diaphragm, or cervical cap when you become ill, remove it immediately, even before calling your doctor.