14 Sepsis Symptoms

2. Chills

You may start to feel chills early in sepsis as your body begins reacting to an infection. The shivering often feels stronger than simply being cold and can be intense enough to make your teeth chatter. As part of the immune response, the nervous system raises body temperature to make it harder for bacteria or viruses to survive.

This rapid change in temperature causes muscles to tighten and shake as the body tries to restore balance. In the early stages of sepsis, chills may come and go along with fever or sweating. As the condition progresses, chills can become more frequent and intense and may appear with a fast heart rate or rapid breathing.

In severe cases, the skin may feel cold to the touch even though the body’s internal temperature remains high. Chills often occur alongside other warning signs, such as sudden temperature changes, muscle pain or weakness, confusion, dizziness, or a rapid heartbeat.

3. Abnormal Sweating

Abnormal sweating can be an early warning sign that sepsis is developing. You may notice your skin feels unusually damp, even when the room is cool or you have not been physically active. This happens when your body begins reacting to an infection and its temperature control system becomes unbalanced.

In the early stages, sweating may appear along with a mild fever, chills, and general discomfort. As your body works harder to fight germs, your temperature may rise and fall quickly. These rapid changes can cause cold or clammy sweating. As sepsis progresses, sweating can become heavier and more unpredictable. You might feel soaked with sweat while your skin appears pale or blotchy.

At this stage, your heart rate may increase and your breathing may become faster as the body struggles to deliver enough oxygen to vital organs. In later stages, abnormal sweating can signal serious problems with blood flow and temperature control, causing the skin to feel cold even while sweating continues.

4. Elevated Heart Rate

Your heart often beats faster when your body is fighting an infection. During sepsis, this increase in heart rate helps move oxygen and nutrients quickly to organs and tissues that need support. In the early stage, this may appear as a mild but steady rise in pulse, often above 90 beats per minute.

As sepsis advances, inflammation and reduced blood pressure place extra strain on the heart. To compensate, the heart pumps faster to keep blood circulating. You might notice your pulse racing even while resting or feel palpitations in your chest or neck. This response reflects the body’s effort to maintain normal function despite the infection.

In severe stages, the heart rate can become dangerously high. The body may struggle to supply enough oxygen to vital organs, and the heart may no longer keep up with the demand.

5. Increased Respiratory Rate

You may notice that your breathing becomes faster early in sepsis. This happens because the body is trying to get enough oxygen to fight infection and support vital organs. As infection spreads, blood pressure can drop and less oxygen reaches the tissues. To compensate, the body increases the rate of breathing.

A higher-than-normal respiratory rate can be one of the first visible signs that sepsis is developing. A normal adult typically breathes about 12 to 20 times per minute. In the early stage, faster breathing may appear alongside fever or chills and can occur even while resting or doing simple activities. You may begin to feel short of breath sooner than usual.

As sepsis worsens, the lungs may have to work harder. The body’s intense inflammatory response can cause fluid to build up in the lungs, making breathing more difficult and less effective.

6. Decreased Output of Urine

You may notice that you are urinating less often or producing a much smaller amount than usual. This change can be one of the early visible signs that your body is under stress from infection. The kidneys rely on steady blood flow to filter waste and manage fluids.

During sepsis, blood pressure often drops, and organs may not receive enough oxygen and nutrients. When this happens, kidney function can slow down, leading to reduced urine production. You might notice darker urine or go many hours without needing to urinate.

Decreased urine output can occur at any stage of sepsis but often becomes more noticeable as the condition worsens. It signals that circulation and organ function are being affected and that the body may be trying to conserve fluid. In some situations, urine output is measured over time to help track how well the kidneys are working. A low amount over several hours can indicate impaired kidney function.

7. Dizziness or Faintness

You may feel dizzy or faint during sepsis when your body is fighting a severe infection. This happens because blood pressure can drop, reducing the amount of blood and oxygen reaching the brain. As a result, you may feel lightheaded, weak, or close to passing out.

In the early stages, dizziness may be mild or come and go. As the infection worsens, it can become harder to stand or walk without feeling unsteady. This symptom often appears alongside other warning signs such as a fast heartbeat, clammy skin, or confusion.

Faintness is more likely when sepsis causes blood vessels to widen too much, leading to a significant drop in blood pressure. When circulation becomes severely impaired, the body cannot deliver enough oxygen to vital organs. This can lead to shock, a serious medical emergency.

8. A Change in Mental State

You may notice a change in how you think or respond when sepsis begins to affect your brain. Some people feel confused, disoriented, or have trouble remembering simple things. Others may struggle to stay awake or feel mentally foggy. These changes can appear before more obvious physical symptoms.

As the infection worsens, the brain may not get enough oxygen and nutrients due to poor blood flow. This can cause slower reactions, trouble focusing, or even brief moments where you lose awareness of where you are. These changes can happen suddenly, especially in older adults or people already ill from other conditions.

In severe cases, confusion can progress to agitation or unresponsiveness. A person may stare into space, speak unclearly, or seem very different from their usual behavior. Family members usually notice these changes first. When mental changes appear in someone with a possible infection, they should be treated as an important warning sign.

9. A Skin Rash

You might notice a skin rash during sepsis that looks blotchy or uneven. In the early stage, it may appear mild and resemble simple irritation. The skin can look pale, bluish, or mottled, especially around the lips or fingertips. These changes occur when blood flow and oxygen levels drop as the body reacts to infection.

As sepsis worsens, the patches may darken, spread, or feel warm to the touch as the body struggles to regulate temperature. These changes can be subtle at first but often become more noticeable over time. A rash that does not fade when pressed with a clear glass can signal a serious condition linked to sepsis.

This reaction suggests bleeding beneath the skin rather than surface irritation. A rapidly spreading rash or one that appears alongside symptoms such as fever, chills, or confusion is especially concerning. In severe sepsis, reduced blood supply can cause the skin to feel cold or appear bluish.

10. Gastrointestinal Issues

You might first notice changes in your stomach and digestive system as sepsis begins to develop. Early symptoms can include loss of appetite or nausea. These signs may seem mild at first but can worsen quickly as the infection spreads. As the body reacts more strongly, vomiting, diarrhea, or stomach pain may occur.

Infection and inflammation interfere with normal digestive function, and reduced blood flow to the intestines can slow or disrupt digestion. This often leads to bloating, cramping, or general abdominal discomfort. As sepsis becomes more severe, the digestive system may be significantly affected.

You might experience sharp abdominal pain or visible swelling. In some cases, the liver and intestines do not receive enough oxygen, increasing the risk of tissue injury. Ongoing vomiting or diarrhea can also lead to dehydration. Fluid loss complicates the body’s ability to maintain blood pressure and support vital organs, exacerbating the effects of sepsis.

11. Changes in Personality

You may notice changes in personality during or after sepsis that affect how you think, behave, or respond to people and situations. These changes often begin subtly and can be linked to fatigue, confusion, or memory difficulties as the brain recovers from infection and inflammation.

As recovery continues, some people become more irritable, withdrawn, or emotionally sensitive. Normal conversations may feel harder to manage, and small frustrations can seem overwhelming. You may also lose interest in activities you once enjoyed or feel detached from loved ones.

Changes in concentration, memory, or motivation are also common. Tasks that require focus may feel more difficult, and some people experience anxiety, reduced trust, or mood swings as the nervous system heals. These personality changes vary from person to person and often improve gradually over time.

12. Cold, Clammy Skin

Cold, clammy skin can be one of the early signs that your body is struggling to maintain normal blood flow during sepsis. During an infection, a strong immune response causes blood vessels to constrict, diverting blood from the skin to essential organs like the heart and brain. As a result, the skin may feel cool and damp to the touch.

You might notice this change most in your hands or feet, which can appear pale, bluish, or sticky with sweat, even without a fever. This happens as the body works to protect core organs while oxygen levels in the tissues begin to drop. The sensation can feel uncomfortable and may occur along with chills or shivering.

In the early stages of sepsis, clammy skin often reflects poor circulation. As the condition progresses, it can signal more serious problems, including low blood pressure and increased strain on the organs.

13. Fatigue and Weakness

You may notice sudden fatigue and weakness early in sepsis. This is often one of the first signs that the body is struggling to fight infection. You might feel unusually drained, have trouble staying awake, or find it difficult to complete simple tasks. This fatigue can come on quickly and may not improve with rest.

As sepsis progresses, weakness often becomes more noticeable. Your muscles may feel heavy or shaky, and activities such as walking, sitting up, or lifting objects can take much more effort. The body redirects energy toward fighting infection, leaving less available to support normal strength and movement. In more severe stages, fatigue can become extreme. You may feel too weak to get out of bed or speak for long periods.

14. Difficulty Breathing

You may begin to notice difficulty breathing early in sepsis as your body reacts to infection. Inflammation triggered by the immune system can affect the lungs and reduce how well oxygen moves through the blood.

You might breathe faster than normal or feel short of breath, even while resting. As sepsis progresses, fluid can build up in the lungs, making it harder for oxygen to reach vital organs. This may cause chest tightness, discomfort when taking deep breaths, or feelings of lightheadedness and dizziness as oxygen levels drop.

In severe stages, such as septic shock, breathing problems become more intense. Breathing may turn very rapid or shallow, with visible distress or gasping for air. Confusion or anxiety can occur when the brain and organs receive insufficient oxygen, indicating a need for urgent medical care.