Blood Poisoning: Symptoms and Treatment

What is blood poisoning?

Blood poisoning is a serious infection. It occurs when bacteria are in the bloodstream. Despite its name, the infection has nothing to do with poison. “Blood poisoning” isn’t a medical term, but is another term used to describe bacteremia, septicemia, or sepsis.

Still, the name sounds dangerous, and for good reason. Sepsis is a serious, potentially fatal infection. Blood poisoning can progress to sepsis rapidly. Prompt diagnosis and treatment are essential for treating blood poisoning, but understanding your risk factors is the first step in preventing the condition.



What causes blood poisoning?

Blood poisoning occurs when bacteria causing infection in another part of your body enter your bloodstream. The presence of bacteria in the blood is referred to as bacteremia or septicemia. The terms septicemia and sepsis are often used interchangeably, though technically they aren’t quite the same. Septicemia, the state of having bacteria in your blood, can lead to sepsis. Sepsis is a severe and often life-threatening state of infection if it’s left untreated. But any type of infection — whether bacterial, fungal, or viral — can cause sepsis. And these substances don’t necessarily need to be in the bloodstream to bring about sepsis.

Such infections most commonly occur in the lungs, abdomen, and urinary tract. Sepsis happens more often in hospitalized patients, where the risk of infection is already higher.

Since blood poisoning occurs when bacteria enter the blood in conjunction with another infection, you won’t develop sepsis without having an infection first.

Some common causes of infections that can cause sepsis include:

  • abdominal infection
  • an infected insect bite
  • dental extractions or infected teeth
  • exposure of a covered wound to bacteria during surgical recovery; not changing a surgical bandage frequently enough
  • exposure of an open wound to a virus while outdoors
  • infection by drug-resistant bacteria
  • kidney or urinary tract infection
  • skin infection
  • poison ivy infection

Risk factors

Who is at risk for blood poisoning

Some people are more susceptible than others to sepsis. Those who are more at-risk include:

  • people with weakened immune systems, such as those with HIV/AIDS or leukemia
  • young children
  • older adults
  • people who use intravenous drugs such as heroin
  • those who brush their teeth too hard
  • those using a catheter
  • people who’ve had recent surgery or dental work
  • those working in an environment with lots of bacteria or virus exposure, such as in a hospital or outdoors


Recognizing the symptoms of blood poisoning

The symptoms of blood poisoning include:

  • chills
  • moderate or high fever
  • weakness
  • rapid breathing
  • increased heart rate or palpitations
  • paleness of the skin, especially in the face

Some of these symptoms are associated with the flu or other illnesses. However, if you’ve had surgery recently or you’re recovering from a wound, it’s important that you call your doctor immediately after experiencing these possible signs of blood poisoning.

Advanced symptoms of blood poisoning may be life-threatening and include:

  • confusion
  • red spots on the skin that may grow larger and look like a big, purple bruise
  • shock
  • little to no urine production

Blood poisoning can lead to respiratory distress syndrome and septic shock. If the condition isn’t treated right away, these complications can lead to death.


Diagnosing blood poisoning

It’s difficult to self-diagnose blood poisoning because its symptoms mimic those of other conditions. The best way to determine if you have septicemia is to see a doctor. First, your doctor will perform a physical exam, which will include checking your temperature and blood pressure.

If blood poisoning is suspected, your doctor will run tests to look for signs of bacterial infection. Septicemia can be detected with these tests:

  • blood culture testing
  • blood oxygen levels
  • blood count
  • clotting factor
  • urine tests including urine culture
  • chest X-ray
  • electrolyte and kidney function tests

Also, your doctor might see problems with liver or kidney function, as well as imbalances in electrolyte levels. If you have a skin wound, your doctor may take a sample of any fluids leaking from it to check for bacteria.

As a precaution, your doctor may also order an imaging scan. These tests can all help detect infection in your body’s organs:

If bacteria are present, identifying what type they are will help your doctor determine which antibiotic to prescribe to clear the infection.



Treatment options for blood poisoning

Prompt treatment of blood poisoning is essential because the infection can quickly spread to tissues or your heart valves. Once you’re diagnosed with blood poisoning, you’ll likely receive treatment as an inpatient at a hospital. If you’re showing symptoms of shock, you’ll be admitted to the intensive care unit. Signs of shock include:

  • paleness
  • rapid, weak pulse
  • rapid, shallow breathing
  • dizziness or unconsciousness
  • low blood pressure

You may also receive oxygen and fluids intravenously to help you maintain a healthy blood pressure and to help your body get rid of the infection. Blood clots are another concern in immobilized patients.

Sepsis is usually treated with hydration, often through an IV, as well as antibiotics that target the organism causing the infection. Sometimes medications may need to be used to temporarily support low blood pressure; these medications are called vasopressors. If sepsis is severe enough to cause multiorgan dysfunction, a patient may need to be mechanically ventilated, or they may even need dialysis temporarily if the kidneys have failed.



Long-term outlook and recovery

Blood poisoning can be a deadly condition. According to the Mayo Clinic, septic shock has a 50 percent mortality rate. Even if treatment is successful, sepsis can lead to permanent damage. Your risk for future infections may also be greater.

The more closely you follow your doctor’s treatment plan, the greater your chance of a full recovery. Early and aggressive treatment in a hospital intensive care unit increases the chances you’ll survive sepsis. Most people can make a full recovery from mild sepsis with no lasting complications. With the right care you can be feeling better in as little as a week or two.

If you survive severe sepsis, however, you are at risk of developing some serious complications. Some long-term side effects of sepsis include:

  • possible blood clots
  • organ failure, requiring surgery or lifesaving measures to be administered
  • tissue death (gangrene) requiring debridement or possible amputation



The best way to prevent blood poisoning is to treat and prevent infections. It’s also important to prevent any open wounds from becoming infected in the first place with proper cleaning and bandaging. If you’ve had surgery, your doctor will likely prescribe an antibiotic as a precautionary measure against infections. It’s best to err on the side of caution and call your doctor if you suspect you have an infection. Avoid places where you’re likely to encounter bacteria, viruses, or fungi if you are prone to infection.

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