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Jun 4, 2026

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Photo by National Institute of Allergy and Infectious Diseases on Unsplash

Sepsis kills around 11 million people every year. That’s more than prostate cancer, breast cancer, and colon cancer combined. It is one of the leading causes of death in hospitals worldwide, including in countries with advanced healthcare systems. And yet most people have never heard of it — or have heard the word but don’t know what it actually means.

This is a problem, because sepsis is a condition where early recognition saves lives, and early recognition requires people to know what to look for.

Sepsis is not an infection. This is probably the most important thing to understand about it, and it’s where most explanations go wrong.

Sepsis is what happens when your body’s response to an infection gets out of control. Your immune system, which normally sends targeted signals to fight off bacteria or viruses, starts sending those signals everywhere — flooding your bloodstream with inflammatory chemicals that begin to damage your own organs.

Think of it like a fire alarm system that, instead of alerting the fire department to a specific room, activates every sprinkler in the building simultaneously. The fire might be in one small room, but now the whole building is flooded.

Any infection can trigger sepsis — a urinary tract infection, a chest infection, an infected wound, even a dental abscess. The infection itself doesn’t have to be severe. What matters is how your immune system responds to it.

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Sepsis can happen to anyone, but certain groups are significantly more vulnerable. The very young and the very old are at higher risk because their immune systems are either not yet fully developed or have become less efficient with age. People who are immunocompromised — living with HIV, undergoing chemotherapy, on long-term steroids — are at elevated risk. So are people with chronic conditions like diabetes or kidney disease, and anyone who has recently had surgery or been hospitalised.

In clinical practice, I’ve seen sepsis develop from causes that initially seemed minor. A small cut that wasn’t cleaned properly. A urinary infection that was undertreated. The common thread in most cases that go badly is delay — either in recognising that something serious was happening, or in getting appropriate treatment started.

The challenge with sepsis is that the early signs can look like a lot of other things. Fever, chills, rapid breathing, confusion, and feeling generally unwell are not specific to sepsis — they can accompany many infections. What should raise alarm is when these symptoms are severe, are getting worse quickly, or are accompanied by unusually low blood pressure, cold or mottled skin, or a sudden change in mental state.

If you or someone you’re with has a known or suspected infection and rapidly looks or feels significantly worse, seek emergency care. In hospitals, clinicians use structured tools to identify sepsis early and initiate what’s called “the sepsis bundle” — a set of time-sensitive interventions including IV fluids, antibiotics, and blood cultures — that dramatically improves survival rates when started within the first hour.

Time is the single most critical factor in sepsis survival. Studies consistently show that for every hour of delay in starting appropriate antibiotics, mortality increases. This is why sepsis protocols in most hospitals treat it as a medical emergency equivalent to a heart attack or stroke — not something to wait and see about.

If you take one thing from this article, let it be this: sepsis moves fast, and the people who do best are the ones who got help early. When in doubt, go.