13 Frequent Symptoms of Blood Infection

2. Low Circulatory Strain

A blood infection can place heavy stress on your heart. When germs enter your bloodstream, they can reach the inner lining of your heart and valves, leading to a serious infection called endocarditis. Your heart might beat faster than normal, even at rest. Some people feel pounding or an uneven rhythm.

Heart-related signs during a blood infection include a fast heartbeat, a new or changing heart murmur, chest pain, shortness of breath, and swelling in the legs or feet. Bacteria can damage heart valves and stop them from opening or closing the right way. This makes it harder for your heart to pump blood. Small clumps can form and block blood flow to the brain, lungs, or kidneys.

In severe cases, heart failure can develop, meaning your heart cannot pump enough blood for your body. You might feel extreme fatigue, breathlessness, or chest pressure, which can signal serious heart trouble.

3. Low Platelet Check

A low platelet count is common during a blood infection. Platelets help your blood clot and stop bleeding, and when the count drops, your body may struggle to control even small injuries. A normal platelet count ranges from 150,000 to 450,000 per microliter of blood, and a level below 150,000 is called thrombocytopenia. Mild drops may not cause symptoms, but very low levels can increase the risk of serious bleeding.

Warning signs can include easy bruising, tiny red or purple spots on your skin, bleeding gums, nosebleeds, and blood in your urine or stool. In more severe cases, bleeding can occur inside your body without clear signs at first, which can become life threatening without prompt treatment.

A blood test should be done to check your platelet count if these symptoms appear. A blood infection can lower platelets in several ways. The infection may destroy platelets, use them up quickly, or affect your bone marrow. Treatment may include close medical monitoring, platelet transfusions, or medications to help control the underlying response.

4. Shortness of Breath

Shortness of breath can be a serious sign of a blood infection. You may feel like you cannot get enough air, even at rest, and simple tasks, such as walking across a room, may leave you winded. This symptom can appear suddenly or worsen over time, and trouble breathing should never be ignored, especially if it feels new or severe.

A blood infection can cause inflammation that affects your lungs. This can limit how well oxygen moves into your blood. Your breathing may become fast or shallow, and you might also feel chest tightness or pressure. Some people develop a cough or chest pain, while older adults may feel confused or very tired instead of clearly feeling breathless.

As the infection worsens, your oxygen levels can drop, and your heart may beat faster to move more oxygen through your body. You may feel anxious or restless, and shortness of breath often appears with fever, chills, or low blood pressure.

5. Low Blood Temperature

Low blood temperature, also called hypothermia, can appear when you have a serious blood infection. While many infections cause fever, sepsis can make your body temperature drop below 95°F (35°C), which is a warning sign that your body is under stress. A low temperature can be as dangerous as a high fever.

When your temperature falls too low, your organs may not work well. You may feel very cold, even in a warm room. Your skin can look pale and feel cool. Signs include uncontrolled shivering, slow breathing, a slow or weak pulse, confusion, and extreme tiredness.

As your temperature continues to drop, shivering may stop and drowsiness can increase. Older adults, young children, and people with long-term illness face higher risk. Some medicines, such as sedatives and certain heart drugs, can affect body heat control.

6. Chills

Chills cause you to shiver or shake even when the room feels warm, as your muscles tighten and relax fast to create heat. This often happens when your body senses an infection in your blood. Chills can feel sudden and intense and may last a few minutes or continue in waves.

You may notice chills at the same time as a fever or just before your temperature rises. Some people feel cold waves that come and go, while others shake so hard that their teeth chatter. Common features include sudden trembling, feeling very cold without a clear reason, sweating after shaking stops, and cool or clammy skin.

Your immune system releases chemicals to fight germs, which raises your body temperature. The rapid muscle movements help create heat but can leave you weak and tired. If chills appear with fever, fast breathing, confusion, or a rapid heartbeat, seek urgent medical care.

7. Blacking Out

Blacking out means you lose consciousness for a short time. You may faint suddenly or feel dizzy before you pass out. In a blood infection, this can signal a serious drop in blood pressure, which happens when your brain does not get enough blood and oxygen.

Fainting is never a normal response to illness. When bacteria enter your bloodstream, your body reacts quickly. Blood vessels can widen, and your blood pressure can fall. Warning signs may include lightheadedness, blurred vision, nausea, cold clammy skin, and a rapid heartbeat.

In severe cases, you may black out without much warning, and you may wake up feeling confused, weak, or short of breath. Blacking out during a blood infection often points to sepsis, a serious condition that can cause sudden changes in blood flow and organ function.

8. Mental Gestures

A blood infection can change the way you think and react. You may feel confused or have trouble focusing on simple tasks. This shift can happen quickly and may be one of the first warning signs, and you might forget the day or where you are. Family members may notice that you seem distant or unaware.

Some people become restless, anxious, or agitated, while others seem very sleepy or are hard to wake. Warning signs include sudden confusion, slurred speech, trouble staying awake, slow responses to questions, and new mood changes. These changes can mean the infection is affecting your brain and other organs.

Low blood pressure and low oxygen levels can reduce blood flow to your brain, which can make your thinking feel cloudy or slow. Older adults face a higher risk of sudden mental decline during a blood infection.

9. Pain

Pain is a common sign of a blood infection. You may feel it in one area, or it may spread across your body. The pain can feel dull, sharp, or throbbing, and many people notice muscle and joint pain first, with the arms and legs aching even without injury.

You may also feel pain in your abdomen or chest. Abdominal pain can occur with swelling, nausea, or vomiting, while chest pain may worsen with deep breaths if the infection affects your lungs or heart. Headaches are also common and can range from mild to severe, and some people report a stiff neck along with head pain.

Pain from a blood infection often feels stronger than normal aches and may not improve with rest. The discomfort can increase as the infection spreads and affects more organs. New or worsening pain with fever, chills, or weakness should be treated as a serious warning sign.

10. Jaundice

Jaundice causes your skin and the whites of your eyes to turn yellow, which happens when bilirubin builds up in your blood. Bilirubin forms when your body breaks down old red blood cells, and your liver usually clears it. During a blood infection, your liver may not work well, which allows bilirubin levels to rise. You may first see a yellow tint in your eyes, followed by your skin appearing yellow or slightly brown.

Other changes can include dark brown urine, pale or clay-colored stools, itchy skin, fatigue, and weakness, which can develop as the infection affects your liver and slows normal blood flow. Jaundice during a blood infection often means more than one organ is under stress, and you may also have fever, chills, low blood pressure, or confusion.

11. Decline in Urinating

You may notice that you urinate less often than usual. Your urine output may drop even if you drink fluids. This change can signal that your body is under stress from a serious blood infection. A drop in urine can be an early sign that your organs are not getting enough blood flow.

A blood infection can lower your blood pressure, and your kidneys need steady blood flow to filter waste and make urine. You might pass very small amounts of urine, go many hours without urinating, or see darker and more concentrated urine. Swelling in your legs, ankles, or feet can also occur.

When your kidneys slow down, waste and fluid can build up in your body, which may cause symptoms such as feeling tired, confused, or short of breath. In severe cases, kidney failure can develop quickly, and hospital treatment may include close monitoring, IV fluids, or medicines to raise blood pressure.

12. Patches of White or Stained Skin

You may notice areas of skin that look pale, white, gray, or darker than the surrounding skin. These patches can appear suddenly and may spread over hours or days. In a blood infection, skin color changes can signal poor blood flow or damage to small blood vessels, and some areas may feel cool to the touch.

When your body fights a severe infection, it may move blood away from your skin to protect vital organs. This can leave your skin looking uneven or washed out. In serious cases, mottled skin can appear with blotchy pale and purplish patches on your arms, legs, or knees.

Small dark spots that do not fade with pressure can also develop. These skin changes may occur with fever, chills, a fast heartbeat, confusion, or extreme weakness. Skin color changes alone can have many causes, but when they appear with signs of serious illness, they can point to sepsis.

13. Drowsiness

Drowsiness is a common sign of a blood infection. You may feel very tired, weak, or unable to stay awake during normal activities. This is more than everyday fatigue, as sleepiness can feel sudden or much stronger than usual, and you may struggle to keep your eyes open during the day.

When an infection spreads into your blood, your body uses a lot of energy to fight it, which can lower your energy level and affect your brain. You might have trouble focusing, responding quickly, or holding a simple conversation, and in serious cases, you may feel confused or disoriented.

Some people sleep much more than usual and are hard to wake, and drowsiness can appear with fever, a fast heartbeat, or trouble breathing. Older adults and young children may show sleepiness as an early sign of sepsis.