(about 101 degrees Fahrenheit). It is a non-specific finding, but occurs in many diseases, ranging from infectious ( viral infections or infective endocarditis ) to autoimmune to malignant causes. A persistent low grade fever can be a sign of many sicknesses. http://www.thestar.com/living/article/238960     Also, symptoms from Healthline:     http://www.healthline.com/symptomsearch?subtr