Hectic fever is a condition characterized by a high, fluctuating fever with sweating and chills. This type of fever is commonly associated with infectious diseases such as tuberculosis, endocarditis, and sepsis. Some other synonyms for the term "hectic fever" include remittent fever, typhoid fever, bilious fever, and pyrexia. Remittent fever is a persistent fever that does not fully subside, whereas typhoid fever is a severe systemic illness caused by the bacterium Salmonella typhi. Bilious fever is a fever that is accompanied by nausea, vomiting, and yellowing of the skin, while pyrexia refers to a fever without any specific cause or underlying pathology. Regardless of the terminology used, it is important to take fever seriously and seek medical attention if it persists or worsens.