Toxic shock syndrome (TSS) is caused by toxins released by certain strains of bacteria, most commonly Staphylococcus aureus (staph) and group A Streptococcus (strep). These toxins act as “superantigens,” triggering an extreme immune overreaction that can rapidly lead to organ failure and dangerously low blood pressure. While TSS is often associated with tampon use, it can develop from any situation where these bacteria grow unchecked in the body.
How Bacterial Toxins Trigger TSS
TSS isn’t a typical infection where bacteria slowly multiply and overwhelm the body. Instead, the damage comes from specific toxins the bacteria produce. In staph-related TSS, the main culprit is a toxin called TSST-1. In strep-related TSS, the bacteria release a family of toxins known as streptococcal pyrogenic exotoxins. Both types work through the same devastating mechanism.
Normally, your immune system activates a small, targeted fraction of its T cells to fight a specific threat. These toxins bypass that precision entirely. They bind directly to immune cells and activate up to 20% of all T cells at once, compared to the fraction of a percent that would respond during a normal immune reaction. The result is a massive, uncontrolled flood of inflammatory signaling molecules called cytokines. This “cytokine storm” is what produces the hallmark features of TSS: plummeting blood pressure, high fever, widespread rash, and damage to multiple organs simultaneously.
The Tampon Connection
TSS became widely known in the early 1980s after a surge of cases linked to a specific brand of super-absorbent tampons. The connection between tampons and TSS comes down to environment. Tampons create a warm, moist space where staph bacteria already present in the vagina can multiply rapidly. When bacteria are trapped in one area and allowed to grow unchecked, they can produce enough toxin to enter the bloodstream and trigger a systemic reaction.
Higher-absorbency tampons carry more risk because they tend to stay in longer and provide more surface area for bacterial growth. The FDA now requires standardized absorbency labeling on all tampon packaging, and their guidance is straightforward: use the lowest absorbency tampon that manages your flow, change it every 4 to 8 hours, and never leave a single tampon in for more than 8 hours. If you can wear one tampon for a full eight hours without needing to change it, the absorbency is likely too high for your flow.
Non-Menstrual Causes
Roughly half of staph-related TSS cases are not connected to menstruation at all. Any break in the skin or situation that lets staph or strep bacteria access deeper tissue can potentially lead to TSS. Common triggers include:
- Surgical wounds and post-operative infections, particularly if packing material is left in a wound
- Burns and skin injuries, including insect bites that become infected
- Nasal packing used after nose surgery or to stop severe nosebleeds
- Skin and soft tissue infections, such as cellulitis or infected cuts
- Recent childbirth or miscarriage
Streptococcal TSS typically develops alongside invasive strep infections that reach deep tissues or the bloodstream. It can follow something as minor as a small cut, a bout of chickenpox, or even a muscle strain. Strep TSS tends to be more severe than the staph form. Data from Japan showed that during the second half of 2023, nearly 31% of streptococcal TSS patients under age 50 died, a sharp increase from roughly 9 to 20% in prior years.
Who Is Most at Risk
Anyone can develop TSS, but certain groups face higher odds. People who menstruate and use tampons or other insertable menstrual products (like menstrual cups or contraceptive sponges) have elevated risk for staph TSS. Younger people may be more vulnerable because they haven’t yet developed antibodies to TSST-1. People recovering from surgery, those with recent skin wounds, and anyone with a weakened immune system also face increased risk.
Having had TSS once does not protect you from getting it again. In fact, a previous episode may indicate that your body doesn’t produce adequate antibodies against the toxin, making recurrence more likely.
How TSS Is Recognized
TSS progresses fast, often within hours. The clinical picture involves fever of at least 102°F (38.9°C), a sunburn-like rash that spreads across the body, and a dangerous drop in blood pressure. To meet the diagnostic criteria, at least three organ systems must be affected. That can look like vomiting and diarrhea, severe muscle pain, redness of the eyes or mouth, confusion, or signs of kidney or liver stress.
One distinctive feature is skin peeling (desquamation) that occurs one to two weeks after the initial rash, particularly on the palms and soles of the feet. This delayed peeling often confirms the diagnosis in retrospect. Early symptoms can mimic the flu, which is part of what makes TSS so dangerous. By the time the pattern becomes clear, the condition may have already progressed significantly.
Reducing Your Risk
For menstrual TSS, prevention centers on limiting bacterial growth. Alternate between tampons and pads when possible, especially overnight. Wash your hands before and after inserting a tampon. If you use a menstrual cup, follow the manufacturer’s cleaning instructions carefully and empty it at regular intervals.
For non-menstrual TSS, keep wounds clean and watch for signs of infection: increasing redness, warmth, swelling, or fever. If you’ve recently had surgery and develop a sudden high fever with a rash, that combination warrants immediate medical attention. TSS is treated in a hospital with intravenous antibiotics and aggressive supportive care to stabilize blood pressure and protect organs. Outcomes improve dramatically with early recognition, which is why understanding the causes and early warning signs matters so much.