Hi, I am the mom of an adult son who has a rather perplexing symptom. Once or twice a year he gets ill with a high fever. He gets achy, sick to his stomach and runs a really high fever for a couple of days, like 102-103 degrees. It leaves him weak and lethargic. A doctor once referred to it as a fever of unknown origin. Anyone heard of that or gone through this themselves? It is real hard, cause he usually has to miss work because of the fever. He is in his early thirties and has had this problem for many years. Scares old mom sometimes. Thanks for any input. kASEY