What is pyrexia of unknown origin?

Fever of unknown origin. Other names. Pyrexia of unknown origin, Febris e causa ignota. Fever of unknown origin (FUO), refers to a condition in which the patient has an elevated temperature (fever) but despite investigations by a physician no explanation has been found.Click to see full answer. Also, what causes pyrexia of unknown origin?Causes of FUO can be categorized as any of the following: infection: tuberculosis, mononucleosis, Lyme disease, cat scratch fever, endocarditis, and others. inflammation: lupus, rheumatoid arthritis, inflammatory bowel disease, and others.Additionally, is fever of unknown origin deadly? Fever of Unknown Origin (FUO) FUO is body temperature ≥ 38.3° C (101° F) rectally that does not result from transient and self-limited illness, rapidly fatal illness, or disorders with clear-cut localizing symptoms or signs or with abnormalities on common tests such as chest x-ray, urinalysis, or blood cultures. Subsequently, question is, what is puo? Pyrexia of unknown origin (PUO) is a syndrome that has long tested the skills of physicians to achieve a diagnosis in affected patients. As both society and medicine continue to change, the aetiology and epidemiology of the diseases that cause PUO also change.What is the most common cause of fever of unknown origin in older adults?CONCLUSIONS: Multisystem diseases emerged as the most frequent cause of fever of unknown origin in the elderly, and temporal arteritis was the most frequent specific diagnosis. Infections, particularly tuberculosis, remain an important group.