11 Silent Signs of Sepsis You Need to Know

Sepsis, or "blood poisoning," is deadly—but it's also tough to diagnose. Learning to recognize the signs is your best protection against this silent killer.

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Sepsis symptom: fever

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Sepsis strikes more than a million Americans every year, and according to the National Institute of General Medical Sciences, and some estimates show almost half die from it. And yet a survey shows that some 45 percent of Americans have never even heard of sepsis, a deadly condition that happens when a bacterial infection elsewhere in the body enters the bloodstream. People with weakened immune systems are most vulnerable, but anyone can develop sepsis from an initial infection such as pneumonia, a urinary tract infection, or even just a cut on the arm or leg. Although sepsis can easily be treated with antibiotics if caught early, sepsis symptoms can be confused with other conditions, so it often goes undiagnosed until it's too late. That's why it's crucial to learn the signs of sepsis, and the first and most important is a high fever. Sepsis occurs when "toxins from the infecting organism get into the bloodstream and produce inflammation," says noted sepsis expert R. Philip Dellinger, MD, chair and chief of the department of medicine at Cooper University Health Care in Camden, New Jersey. "Fever is the most specific finding of infection-induced systemic inflammation."

Sepsis symptom: a very low temperature

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Alternately, toxins from sepsis can cause the opposite effect. "Very rarely, the body responds to an infection by dropping body temperature, although this is less common," says Craig Coopersmith, MD, a surgeon at Emory University School of Medicine in Atlanta and a leading researcher on sepsis. Studies have shown that a low temp can mean a more serious case of sepsis, and a worse prognosis. The Global Sepsis Alliance says to be concerned if the thermometer readout drops below 96.8. Check out these quirks and facts about your body temperature.

Sepsis symptom: chills

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Ironically, chills often accompany a high temperature—and if this is one of your symptoms, make sure you mention it to the doctor. "Chills are subjective—a patient feels chills but it cannot be observed by health care provider," Dr. Dellinger says. However, a fever and chills can easily be mistaken for a different type of infection, such as the flu, so it's usually only in combination with other symptoms that sepsis can be identified. "The greater the number and magnitude of each finding, the more and more concern there is for sepsis," Dr. Dellinger says.

Sepsis symptom: pain or discomfort

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The pain from fighting off a sepsis infection can be felt all over, or localized to specific spots. For 12-year-old Rory Staunton, one of the most obvious sepsis symptoms was pain in his stomach as well as his leg, which was overlooked by doctors. "We made our way to the ER at a major New York medical institution, where the doctors said Rory's discomfort was caused by a sick stomach and dehydration," says Orlaith Staunton, Rory's mother. Sadly, Rory's sepsis, which he contracted after he cut his arm in gym class, was not caught in time. "The following morning, he continued to complain of pain," she says. "We brought Rory back to hospital on Friday evening and this time they admitted him to the ICU. He was gravely ill." Rory died two days later. His parents established the Rory Staunton Foundation in his memory to promote sepsis education and awareness, for which Staunton was honored by the L'Oréal Paris Women of Worth philanthropic program.

Sepsis symptom: low blood pressure

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Low blood pressure is "likely the most serious manifestation" of the infection, Dr. Dellinger says, and can indicate septic shock, the most critical stage. Low blood pressure happens during sepsis as blood vessels start to lose fluid and veins and arteries relax, so blood is not moving through the body as it should. "In its most severe form the low blood pressure does not respond to fluid replacement, and the patient requires medicine delivered into the vein to raise blood pressure," Dr. Dellinger says. New medical guidelines for sepsis released this year instruct doctors to be on the lookout for a decrease in systolic blood pressure (the top number) to less than 100.

Sepsis symptom: fast heart rate

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With sepsis, your heart tries to move blood more efficiently so it can fight the infection. "A common response to being sick is for the body to increase the amount of blood being pumped from their heart," Dr. Coopersmith explains. "The two ways the body has to do this are to increase heart rate and to pump the heart more strongly. This increased blood gives the body a greater chance to fight the infection." A heart rate of 90 beats a minute or greater may be one of the signs of sepsis, according to the Mayo Clinic.

Sepsis symptom: shortness of breath

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Another hallmark of sepsis that the new guidelines say to watch for is a breathing rate greater than 22 breaths per minute. Sepsis can cause fast breathing for two reasons: "One is that the infection is in the lungs, which causes decreased oxygen," says Dr. Coopersmith, who was on the task force that developed the guidelines. Pneumonia, which he says is the most common cause of sepsis, is one such infection. But, "even if the infection is not in the lungs, as the infection progresses, the body's need for oxygen increases and the need to release carbon dioxide increases. The body responds to this by breathing faster and feeling short of breath." Note that shortness of breath can also be a sign of a heart attack.

Sepsis symptom: pale, mottled, or clammy skin

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As your body diverts its energy and resources to the brain and heart, it can start to neglect what it considers less critical organs, like the skin. "When a patient gets septic, the body moves blood flow to the most vital organs and away from parts that are less important to staying alive," Dr. Coopersmith says. "So it can result in less blood flow to the skin, and cause it to be pale." Orlaith Staunton notes that her son Rory had oddly mottled skin, which was also dismissed by doctors until it was too late. "They were not looking for sepsis and therefore they failed to detect and diagnose it," she says. "If Rory's doctors had thought to ask if sepsis could be the reason for his symptoms, they would have seen it immediately." Pale skin is also a clear sign that you may be about to faint.

Sepsis symptom: sleepiness or mental confusion

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Although Dr. Dellinger says this is more common in elderly patients, Orlaith Staunton noticed marked sleepiness in her son, Rory. Just like when you're tired or when you have a cold, your body needs rest to try to fight off the infection. But Dr. Coopersmith notes that low blood pressure can also make you feel out of it. "When your blood pressure falls below a certain point, you don't get enough blood flow to your brain, and you can be sleepy or confused," he says.

Sepsis symptom: decreased urination

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Due to the dehydration that can occur with sepsis, patients with the condition start to pee less. This could happen because you eat and drink less when you don't feel good, or if you're throwing up or have diarrhea. But it could also be caused by something more serious: "leaky" blood vessels. "Think of blood vessels as being like a garden hose, and millions of small pinholes in a garden hose cause the fluid to leak out" into the body, Dr. Coopersmith says. Research has targeted this condition to figure out new therapies to treat it. Here's what else your urine says about your health.

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