Toxic shock syndrome (TSS) starts with symptoms that can feel like the flu, then escalates fast. A high fever of 102°F (38.9°C) or higher, a flat red rash resembling a sunburn, vomiting or diarrhea, and severe muscle aches are the hallmark early signs. What makes TSS dangerous is how quickly it progresses: within 24 to 48 hours, blood pressure can drop to dangerous levels and organs can start to fail.
Early Symptoms That Appear First
The first signs of TSS typically look a lot like a bad flu. You may develop a sudden high fever with chills, intense muscle aches, nausea, and vomiting. These symptoms can appear whether TSS is caused by a staph infection (often linked to tampon use, wound packing, or skin infections) or a strep infection (which tends to follow wounds, surgical sites, or even minor skin breaks).
What distinguishes TSS from a regular illness is the rash. It’s a flat, widespread redness that looks like a sunburn rather than raised bumps or hives. It shows up most prominently on the palms of the hands and the soles of the feet. Diarrhea, headache, and a sore throat can also appear early on. Redness of the eyes, mouth, or throat (the mucous membranes) is another common early finding.
How Symptoms Escalate Within Hours
TSS moves fast. After the initial flu-like symptoms begin, it typically takes only 24 to 48 hours for blood pressure to drop dangerously low. Once that happens, the situation becomes critical. A systolic blood pressure of 90 or lower in an adult is one of the defining features of TSS, and it can cause dizziness, lightheadedness, or fainting.
As blood pressure falls, your heart rate speeds up and breathing becomes rapid as the body tries to compensate. Confusion, disorientation, or altered consciousness can develop even before blood pressure drops noticeably. These neurological changes reflect how aggressively the toxins produced by the bacteria affect multiple systems at once.
Organ Systems Affected by TSS
TSS is a whole-body crisis. For a case to meet the CDC’s clinical definition, at least three organ systems must be involved alongside the fever, rash, and low blood pressure. In practice, most people with TSS experience problems across several of these areas simultaneously:
- Digestive system: vomiting and diarrhea, usually starting early in the illness
- Muscles: severe muscle pain that goes well beyond typical body aches
- Kidneys: reduced kidney function appears early and actually precedes the drop in blood pressure in many patients. About 70% of people recover kidney function fully, but roughly 10% develop permanent kidney damage.
- Liver: inflammation that shows up on blood tests
- Blood: a dangerous drop in platelet count, which impairs the blood’s ability to clot
- Brain: confusion and disorientation without other neurological causes
The kidney involvement is worth paying attention to because it often appears before other signs of severe illness. If you’re sick with a fever and flu-like symptoms and notice you’re producing very little urine or it’s unusually dark, that can be an early red flag.
Skin Peeling in Later Stages
One of the most distinctive features of TSS happens after the acute illness: the skin begins to peel. This typically occurs one to two weeks after the rash first appeared and is most noticeable on the palms and soles. The peeling is caused by the damage the bacterial toxins inflict on skin cells during the initial illness. In confirmed cases, this peeling is considered a key diagnostic marker. In fact, the CDC’s case definition requires it for a confirmed diagnosis, unless the patient dies before it has time to develop.
Staph TSS vs. Strep TSS
Both types share the core symptoms of fever, rash, low blood pressure, and multi-organ involvement, but there are important differences in how they present and how dangerous they are.
Staphylococcal TSS is the type most people associate with tampon use, though it also occurs after surgeries, wound infections, and skin injuries. The sunburn-like rash is especially characteristic of this form, and the illness often starts without an obvious source of pain at the infection site.
Streptococcal TSS (sometimes called STSS) tends to be more severe. It usually starts when strep bacteria spread from a wound or skin infection into deep tissue and the bloodstream. Pain at the infection site is often intense and disproportionate to what the wound looks like. Soft tissue destruction is common, and many patients with STSS need surgery to remove infected tissue. In some cases, amputation becomes necessary to stop the infection from spreading. The mortality rate reflects this severity: even with treatment, up to 3 out of 10 people with streptococcal TSS die from the infection.
Who Gets TSS
TSS is rare. Invasive strep infections occur at a rate of roughly 8 per 100,000 people in North America, and only about 8 to 22% of those cases develop into streptococcal TSS. Staphylococcal TSS has become less common since the 1980s, when highly absorbent tampons were pulled from the market.
That said, TSS is not limited to menstruating women using tampons. It can develop after any situation where bacteria have access to the body: surgical wounds, burns, skin infections, nasal packing after surgery, and even minor cuts or scrapes. People with weakened immune systems, recent viral infections like chickenpox or flu, and those with open wounds are at higher risk. Streptococcal TSS in particular can follow surprisingly minor injuries.
What the Full Picture Looks Like
Putting it all together, TSS typically unfolds in a recognizable pattern. It starts with a sudden high fever, chills, muscle pain, and stomach symptoms that feel like a severe flu. Within the first day, a flat, sunburn-like rash appears. Over the next 24 to 48 hours, blood pressure drops, the heart races, breathing quickens, and confusion may set in. Without treatment, organ failure follows rapidly. One to two weeks after the illness begins (in survivors), skin on the hands and feet peels.
The speed of this progression is what makes TSS so dangerous. A person can go from feeling like they have the flu to being critically ill in under two days. If you develop a sudden high fever with a rash, especially after a wound, surgery, or tampon use, and you feel rapidly worse rather than better, that combination warrants emergency medical attention.