Blood poisoning: what it is, signs, and why it is dangerous

When people hear about blood poisoning, many imagine something vague and frightening. In fact, it is a condition with a clear medical name, and it is useful to know its signs in advance. Let us calmly, without panic, sort out what this thing is and what to look out for.

What blood poisoning is and how it differs from sepsis

In everyday speech, "blood poisoning" refers to sepsis. According to the modern definition, it is a pathological process based on generalized inflammation in response to an infection — bacterial, viral, or fungal — leading to acute organ dysfunction. That is, the issue is not simply microbes in the blood, but that the body's own immune response begins to damage organs. Separately, there is the concept of bacteremia — the presence of bacteria in the blood; this is not the same as sepsis. The main takeaway: blood poisoning is not a "local" problem but a systemic reaction of the whole body.

Why blood poisoning occurs: causes and risk groups

The exact cause of sepsis is unknown; it is believed that the immune system overreacts to an infection and begins to damage organs. Most often bacterial infections are to blame: pneumonia, urinary tract infections, abdominal infections such as appendicitis, skin infections — cellulitis or an infected wound. Sometimes sepsis starts from a small cut or an infection after surgery, and sometimes a person did not even know about their infection. The risk is higher in people aged 65 and older, with chronic diseases (diabetes, lung disease, cancer, kidney disease), weakened immunity, in pregnant women, and in children under one year old. The takeaway is simple: any infection is a reason to monitor the condition, not to wave it off.

Symptoms of blood poisoning

In adults, common signs include confusion or slurred speech, uncontrollable shivering, muscle pain, difficulty breathing, bluish, pale, or mottled skin and lips, high or low temperature (in older people high temperature is less common), no urine all day or very little urine in the last 18 hours. Here are the main ones:

• confusion or slurred speech;
• uncontrollable shivering;
• muscle pain;
• difficulty breathing;
• pale, bluish, or mottled skin.

Blood inflammation: does such a diagnosis exist

"Blood inflammation" is another colloquial expression usually used to describe the same blood poisoning. Sepsis is a systemic inflammation of the body in response to an infection, not inflammation of a single organ. Bacteremia (bacteria in the blood) is a separate concept. The takeaway: if you hear "blood inflammation," clarify what condition is being discussed.

How doctors detect sepsis

Diagnosis begins with asking about symptoms and an examination: the doctor checks temperature, blood pressure, pulse, and breathing. Then laboratory tests are usually ordered to look for signs of infection or organ damage, and imaging may be arranged — an X-ray or CT scan — to find the source of the infection. The severity of organ impairment is assessed using the SOFA score: two or more points indicate dysfunction. Many signs of sepsis also occur in other diseases, so early diagnosis can be difficult. The takeaway: the earlier the examination begins, the better the prognosis.

Complications and when urgent help is needed

Severe cases lead to septic shock with a dangerous drop in blood pressure and multiple organ failure. After surviving sepsis, post-sepsis syndrome is possible: severe fatigue, hearing loss, nerve damage with numbness or weakness in the arms and legs, problems with the heart, kidneys, and lungs, depression and anxiety, and worsening memory and concentration. It often lasts from 6 to 18 months, and in some people longer. Surviving sepsis also increases the likelihood of new infections due to damage to the immune system.

Suspicion of sepsis alone is not a reason to panic, but call 103 or 112 if an adult or a child over 5 years old has very rapid breathing, confusion or slurred speech, bluish, pale, or mottled skin, very high or very low temperature with chills, or a rash that does not fade when pressed. In a child under 5 years old — difficulty breathing with pulling in under the ribs, a rash that does not blanch when pressed, no urine for 12 hours, or the child is difficult to wake or unusually drowsy.

This material is for reference and does not replace a doctor's consultation: if in doubt, it is better to see a specialist than to wait for it to "go away on its own."

This content is for reference and does not replace a doctor's consultation. Medical disclaimer