Warning signs of sepsis: A clinical guide to symptoms and emergency recognition

Warning signs of sepsis include confusion, shortness of breath, fever or shivering, clammy skin, a fast heart rate, weak pulse, and extreme pain or discomfort. Sepsis is the body’s extreme response to an infection and is a life-threatening medical emergency that can cause tissue damage, organ failure, and death without timely treatment. 1

What sepsis means

Sepsis develops when an infection triggers a widespread chain reaction throughout the body. Instead of remaining limited to the original infected area, the immune response can injure healthy tissues and organs. Almost any infection can lead to sepsis, including bacterial, viral, and fungal infections. Common starting points include the gastrointestinal tract, lungs, skin, and urinary tract. 1

Early symptoms can resemble influenza or another routine illness, which makes recognition difficult. Medical sources describe sepsis as a clinical syndrome involving life-threatening organ dysfunction caused by a dysregulated response to infection. As the condition worsens, rapid breathing, a rapidly beating heart, confusion, falling blood pressure, and reduced urine production may develop. 4

Warning signs in adults

Adults with a possible infection should be assessed urgently when their overall condition changes substantially or symptoms seem far more severe than expected. Confusion, disorientation, slurred speech, unusual drowsiness, difficulty staying awake, severe breathlessness, extreme shivering, muscle pain, and a feeling that something is seriously wrong are recognized warning signs. No single symptom confirms sepsis, and symptoms can appear in different combinations. 2

• Fever, shivering, or feeling unusually cold
• Clammy, sweaty, pale, mottled, or discolored skin
• Fast heart rate or a weak pulse
• Shortness of breath or rapid breathing
• Extreme pain or discomfort
• Confusion, disorientation, or reduced alertness
• Passing little or no urine

Passing little or no urine is particularly important because reduced urine output can indicate impaired kidney function or broader organ dysfunction. A high temperature is possible, but sepsis can also involve an abnormally low body temperature. Therefore, the absence of fever does not exclude a serious response to infection. 4

Breathing, circulation, and skin changes

Breathing changes may be among the most visible signs. Severe difficulty breathing can involve gasping, choking, pauses, or an inability to speak normally without stopping for breath. Rapid breathing can occur as the body responds to infection and impaired circulation. A rapidly beating heart, weak pulse, or falling blood pressure can indicate that circulation is becoming unstable. 3

Skin findings can also signal deterioration. Cold, clammy, pale, mottled, bluish, or gray skin may reflect impaired circulation. On brown or black skin, color changes can be easier to see on the palms or inside the forearms. A rash that does not fade when pressed with a glass, or that resembles bruising or bleeding beneath the skin, is an emergency warning sign described by NHS guidance. 3

Signs in children and infants

Children may show sepsis differently from adults. Concerning features include very fast breathing, severe difficulty breathing, grunting, pauses in breathing, the skin pulling in beneath the ribs, unusual limpness, reduced responsiveness, difficulty waking, a weak high-pitched cry, or a first seizure. Pale, blue, gray, cold, clammy, mottled skin and a non-fading rash are also serious findings. 3

• Children under five may stop feeding or vomit repeatedly.
• A child under five may not pass urine for 12 hours.
• A child may appear very lethargic or difficult to wake.
• A non-fading rash requires emergency assessment.
• Infants younger than three months with a temperature of 38°C or higher, or 36°C or lower, require particular attention under NHS guidance, excluding specified recent vaccination circumstances.

Changes in behavior can be as important as measured temperature. A child who is not responding normally, cannot focus, becomes floppy, or has a markedly different cry may be seriously unwell. Infants and young children can deteriorate without clearly identifying where an infection began, so the combination of infection concerns and a major change in appearance or behavior warrants emergency medical evaluation. 3

Who has increased risk

Anyone can develop sepsis, but risk is higher among people with underlying medical conditions or a recent hospitalization. Medical references also identify weakened immunity, chronic disorders, artificial joints, and artificial heart valves or other heart-valve abnormalities as risk factors. Older adults, infants, pregnant or recently pregnant people, and people with chronic illnesses or weakened immune systems require particular attention when infections worsen. 1

Risk status does not determine whether symptoms are serious. Sepsis may follow pneumonia, a urinary or kidney infection, a skin infection, an infected wound or burn, appendicitis, gallbladder or intestinal infection, meningitis, or an infection after surgery. Bacteria cause most cases, although viral infections such as influenza and fungal infections can also lead to sepsis. 1

When emergency care is necessary

Possible sepsis should be treated as a medical emergency rather than monitored at home until symptoms improve. Emergency help is appropriate for severe breathing difficulty, blue, gray, or very pale skin, unusual drowsiness or difficulty waking, cold clammy mottled skin, a non-fading rash, new confusion, or a combination of infection symptoms with rapid breathing and reduced urine. 3

Healthcare professionals assess symptoms, vital signs, organ function, and possible infection sources. Confirmation may involve detecting bacteria in blood, urine, or another sample, although diagnosis is primarily clinical and should not be delayed while waiting for every result. Hospital treatment may include antibiotics, oxygen, intravenous fluids, medications to raise blood pressure, and drainage or removal of infected or dead tissue when necessary. 4

Sepsis can progress to septic shock, a condition involving dangerously low blood pressure that does not improve adequately with fluids and medications. Septic shock can severely reduce tissue perfusion and cause failure of organs such as the lungs, kidneys, and liver. The speed of recognition and treatment is therefore central to the medical response, especially when symptoms are escalating. 4

Sources

1. Centers for Disease Control and Prevention, About Sepsis: https://www.cdc.gov/sepsis/about/index.html
2. The UK Sepsis Trust, Spotting the Signs of Sepsis: https://sepsistrust.org/about-sepsis/spotting-the-signs-of-sepsis/
3. NHS inform, Sepsis: https://www.nhsinform.scot/illnesses-and-conditions/blood-and-lymph/sepsis/
4. Merck Manual Consumer Version, Sepsis and Septic Shock: https://www.merckmanuals.com/home/infections/bacteremia-sepsis-and-septic-shock/sepsis-and-septic-shock
5. Cleveland Clinic, Sepsis: https://my.clevelandclinic.org/health/diseases/12361-sepsis
6. Stony Brook Medicine, What Is Sepsis?: https://health.stonybrookmedicine.edu/sepsis-early-signs-causes-and-when-to-go-to-the-er/