List of diseases that include low-grade fever as a symptom. Any major, well-known medical conditions associated with low-grade fever are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with low-grade fever as a symptom can be seen below. For any real, further diagnosis of something you feel you might have, please consult a doctor. This list includes information about each disease, such as what risks are associated with it. List illnesses include AIDS, Rheumatoid arthritis and many additional illnesses as well.This list answers the questions, "What risks are associated with low-grade fever?" and "What disease can I have if I have low-grade fever?"