What condition can still exist even in the absence of fever, particularly in vulnerable populations?

Sepsis is a serious medical condition that can occur even when a fever is not present, particularly in vulnerable populations such as the elderly, infants, or individuals with weakened immune systems. While fever is a common sign of an infection leading to sepsis, it is not a definitive symptom, and many patients may present with normothermia (normal body temperature) or hypothermia (lower than normal body temperature).

In these populations, the body's usual response to infection may be altered, meaning that typical signs of sepsis, including fever, can be absent. Instead, other signs, such as changes in mental status, increased heart rate, or low blood pressure, may be more apparent and should raise suspicion for sepsis. Understanding that sepsis can occur without fever is crucial for timely identification and treatment, as delays can lead to severe complications.

Other conditions mentioned, such as cardiac arrest, hypotension, and shock, do not typically link to the absence of fever in the same way sepsis does. While they can occur as complications of various illnesses, they are not specifically indicated as conditions that may exist without fever, especially in vulnerable populations.