Sepsis in Adults: Symptoms and When to Seek Emergency Care

Sepsis is a medical emergency caused by the body’s life-threatening response to an infection. Early warning signs in adults include rapid breathing, a racing heart rate, confusion or severe dizziness, sudden chills or abnormal body temperature, extreme pain, and pale or clammy skin. If an infection seems to be rapidly worsening or causes altered mental status and trouble breathing, seek emergency medical care immediately.

Most everyday infections—a urinary tract infection, a sinus flare-up, a cut on the hand, or bronchitis—stay relatively localized and resolve with routine rest, fluids, or standard medical treatment.

Sepsis occurs when that typical immune response goes dangerously off track. Instead of keeping the infection contained, the body triggers a chain reaction throughout multiple systems, leading to widespread inflammation, reduced blood flow, and tissue damage.

Recognizing the earliest indications that an infection has escalated into sepsis can save a life. Because sepsis can deteriorate rapidly over a matter of hours, knowing what to look for and when to head directly to an emergency department is vital.

What Is Sepsis?

According to the Centers for Disease Control and Prevention (CDC), sepsis is defined as the body’s extreme, life-threatening response to an existing infection. It is not an infection in itself, but rather an uncontrolled physiological reaction to one.

When fighting an infection, your immune system releases chemical signals into the bloodstream. In sepsis, these signals trigger widespread inflammation that can impair blood flow, damage blood vessels, and starve vital organs—including the kidneys, lungs, heart, and brain—of oxygen and nutrients. Left unaddressed, sepsis can lead to organ failure, septic shock, and death.

Early Signs of Sepsis in Adults

Sepsis does not follow an identical script for everyone. One person might develop a high fever and shaking chills, while another may have an unusually low body temperature and severe confusion. You do not need to display every symptom below for sepsis to be present; rather, it is the combination of an infection alongside systemic bodily changes that raises red flags.

1. Rapid Breathing or Shortness of Breath

One of the earliest and most reliable indicators of sepsis is tachypnea—breathing significantly faster than normal. As the body’s tissues struggle to receive adequate oxygen and acidic metabolic waste builds up in the blood, the respiratory system accelerates to compensate. You may notice shallow, rapid breathing even while resting in bed.

2. Fast Heart Rate or Weak Pulse

A racing heart (tachycardia), often exceeding 90 to 100 beats per minute at rest, occurs as the heart pumps faster to maintain blood flow to failing tissues. In some cases, the pulse may feel rapid yet weak or “thready” due to dropping blood pressure.

3. Confusion, Disorientation, or Slurred Speech

Changes in mental state are among the most serious early signs. When blood pressure drops and inflammatory molecules affect blood-brain barrier function, cerebral perfusion suffers. The person may seem unusually confused, struggle to answer simple questions, slur their words, or appear profoundly disoriented about where they are.

4. Fever, Shivering, or Feeling Abnormally Cold

While a high fever with violent shaking chills (rigors) is a classic presentation, sepsis can also cause hypothermia (a body temperature dropping below 96.8°F / 36°C). An abnormally low body temperature is frequently observed in older adults or people with compromised immune systems and often signals severe systemic stress.

5. Extreme Discomfort or “Worst Pain” Experienced

Individuals recovering from sepsis frequently recall feeling overwhelmingly unwell—often describing it as “the worst pain I’ve ever felt” or saying, “I felt like I was dying.” This severe, generalized body ache or intense localized pain goes far beyond typical flu aches.

6. Clammy, Pale, or Sweaty Skin

As blood is redirected toward core organs, peripheral blood flow drops. This can leave the skin feeling cold, sweaty, or distinctly clammy.

7. Pale, Ashen, or Mottled Skin

In advancing stages, reduced peripheral circulation and micro-clotting in small blood vessels can cause visible discoloration. The skin may appear unusually pale, ashen, bluish around the lips and nail beds, or develop a patchy, purplish, lace-like appearance known as mottling—most commonly visible on the knees and feet.

8. Severe Weakness and Inability to Stay Awake

Extreme lethargy where a person cannot stand up, cannot hold a conversation, or is unusually difficult to wake up indicates profound systemic illness and demands prompt medical evaluation.

When Should You Go to the ER for Sepsis Symptoms?

Sepsis is an acute medical emergency on par with a heart attack or stroke. Treatment is most effective when initiated during the earliest hours of organ distress.

Call 911 or go to the nearest emergency room immediately if an existing or suspected infection is accompanied by any of the following warning signs:

• New or worsening confusion, disorientation, or difficulty speaking
• Labored, very rapid, or difficult breathing
• Inability to stay awake or profound drowsiness
• Lips, tongue, or skin that appear bluish, grayish, or mottled
• Inability to stand, walk, or support body weight
• Drastic decrease in urination (e.g., no urine output for an entire day)
• Severe, sudden dizziness or fainting upon sitting up or standing

When you arrive at the emergency department, clearly tell triage staff: “I am concerned this could be sepsis.” Using that specific phrase alerts medical staff to rapidly assess vital signs, screen for organ distress, and prioritize urgent blood work.

What Causes Sepsis?

Sepsis begins with an infection. Any pathogen—bacteria, viruses, fungi, or parasites—can trigger it, though bacterial infections are the most common cause.

The primary infection usually originates in one of several key areas:

• Lungs (Respiratory Tract): Bacterial or viral pneumonia is the single most common trigger of sepsis.
• Urinary Tract: Kidney infections, complicated bladder infections, or catheter-associated urinary tract infections (UTIs) frequently lead to sepsis, particularly among older individuals.
• Skin and Soft Tissue: Cellulitis, infected surgical incisions, burns, pressure ulcers, or infected animal bites can introduce pathogens that provoke a systemic response.
• Abdomen and Digestive System: Conditions like appendicitis, diverticulitis, gallbladder infections, bowel perforations, or peritonitis can trigger severe abdominal sepsis.
• Bloodstream Infections: Direct presence of bacteria in the blood (bacteremia), often stemming from central venous catheters, dialysis ports, or untreated focal infections.

Sepsis vs. a Normal Infection: What’s the Difference?

Having an infection does not mean you have sepsis. Distinguishing typical illness from systemic decompensation comes down to how your body is coping:

Typical Infection	Sepsis
Localization: Symptoms primarily center around the affected site (e.g., burning during urination, productive cough, local redness on skin).	Systemic Impact: Symptoms spread across body systems (e.g., lung infection paired with confusion, racing heart, and low blood pressure).
Vital Signs: Breathing rate and blood pressure remain largely stable; pulse elevates mildly in proportion to fever.	Vital Instability: Markedly fast breathing, racing heart rate, or a precipitous drop in blood pressure.
Mental Clarity: Fatigued and worn out, but oriented to time, place, and conversation.	Altered Mental State: Lethargic, confused, slurred speech, or profound disorientation.
Progression: Tends to plateau or slowly improve with standard outpatient care and fluids.	Progression: Rapid decline over hours; symptoms escalate noticeably in severity.

How Sepsis Can Progress to Septic Shock

Clinical guidelines define sepsis along a spectrum of increasing physiologic distress:

1. Sepsis: An infection causes systemic organ dysfunction. For instance, the kidneys may begin producing less urine, platelet counts might drop, or oxygen levels decline.
2. Septic Shock: The most severe and dangerous phase. Here, profound cellular and circulatory abnormalities occur. Blood pressure drops to dangerously low levels that do not rebound even after receiving aggressive intravenous (IV) fluid resuscitation. The heart struggles to pump adequately, and blood vessels lose their tone, leading to widespread oxygen starvation of vital organs and elevated blood lactate levels.

Septic shock carries a high mortality rate and requires immediate intensive care support. Early identification before blood pressure collapses is critical to preventing progression into shock.

Who Is at Higher Risk of Developing Sepsis?

While anyone fighting an infection can theoretically develop sepsis, certain populations are substantially more vulnerable:

• Adults Aged 65 and Older: Aging immune systems and underlying chronic conditions make older adults disproportionately vulnerable.
• People with Chronic Medical Conditions: Diabetes, chronic kidney disease, cirrhosis, heart failure, and chronic obstructive pulmonary disease (COPD) increase susceptibility.
• Individuals with Compromised Immune Systems: Patients undergoing chemotherapy, organ transplant recipients taking immunosuppressants, and people living with autoimmune conditions or advanced HIV.
• Recent Hospitalizations or Surgeries: Invasive procedures, urinary catheters, intravenous lines, and surgical wounds create entry points for pathogens, including antibiotic-resistant hospital-acquired bacteria.
• Young Infants: Infants under one year old, particularly newborns whose immune defenses are not fully developed.

How Is Sepsis Diagnosed and Treated?

Medical teams treat sepsis as a time-critical diagnosis. Treatment typically begins in the emergency department and continues in a step-down or intensive care unit (ICU).

• Rapid Evaluation: Doctors evaluate vital signs, respiratory rates, and mental status, ordering blood tests to check white blood cell counts, kidney and liver enzymes, clotting markers, and blood lactate (a marker of tissue oxygen starvation). Blood and site-specific cultures (urine, sputum, wound swabs) are taken to identify the exact organism.
• Intravenous Antibiotics: Broad-spectrum antibiotics are typically administered via IV as quickly as possible—ideally within the first hour of recognition—to target likely pathogens before culture results return.
• IV Fluids: Large volumes of intravenous fluids are administered to restore circulating blood volume, elevate blood pressure, and maintain organ perfusion.
• Vasopressors: If blood pressure remains critically low despite adequate fluid administration (septic shock), doctors use medications called vasopressors (such as norepinephrine) to constrict blood vessels and raise arterial pressure.
• Supportive Care: Oxygen therapy, mechanical ventilation, or temporary kidney dialysis may be used to support organs while the infection is brought under control.
• Source Control: Removing infected medical devices, draining abscesses, or performing surgery to debride damaged tissue is often necessary to eliminate the root cause of the infection.

Can Sepsis Be Prevented?

Because sepsis begins with an ordinary infection, the best defense is preventing infections from taking hold and managing them properly when they do:

1. Keep Vaccines Current: Staying up to date on recommended immunizations—such as those for influenza, COVID-19, pneumococcal disease, and RSV—dramatically lowers the risk of primary respiratory infections that frequently precipitate sepsis.
2. Practice Good Wound Hygiene: Wash any cut, scrape, or burn promptly with mild soap and clean water. Keep wounds covered, clean, and dry, and watch for spreading redness, warmth, or drainage.
3. Manage Chronic Illnesses: Keep conditions like diabetes and kidney disease well controlled under the guidance of your physician.
4. Treat Infections Promptly: Do not ignore signs of a worsening infection, such as painful urination that progresses to flank pain, or a chest cold accompanied by worsening shortness of breath.
5. Wash Hands Frequently: Simple, consistent handwashing remains one of the single most effective ways to prevent bacterial and viral transmissions.

Frequently Asked Questions

What are usually the very first signs of sepsis?

The earliest indications often include a noticeably rapid breathing rate, a heart that beats unusually fast while resting, feeling uncharacteristically weak or shaky, and subtle mental haziness or disorientation.

Can you have sepsis without a fever?

Yes. Sepsis does not always cause a high fever. In fact, an abnormally low body temperature (hypothermia) can occur and is particularly common in elderly patients or individuals with weakened immune systems. A lack of fever does not rule out sepsis if other systemic symptoms are present.

How quickly can sepsis get worse?

Sepsis can escalate from subtle discomfort to severe organ dysfunction or septic shock within hours. Because of this speed, waiting to see if symptoms improve on their own is hazardous if warning signs like confusion or respiratory distress have emerged.

Is sepsis contagious?

No, sepsis itself is not contagious. You cannot “catch” sepsis from someone else. However, the underlying bacterial, viral, or fungal infection that initially triggered the response (such as influenza, strep throat, or COVID-19) may be transmissible to others.

Can healthy adults get sepsis?

Yes. While older individuals and those with chronic health conditions are at greater risk, previously healthy adults can and do develop sepsis from seemingly minor issues, including an infected bug bite, an untreated tooth abscess, or a typical case of community-acquired pneumonia.