Hi there, Well, fever is usually a common symptom when there is an infectious process, whether of viral origin, bacterial, among others. But also it is usually accompanied by other symptoms that help to know its origin, for example, chills, cough, rhinorrhea, among others. It is difficult for me to give you a complete answer since I do not know any other symptoms besides the fever and because I am not doing a physical examination. I would like to know more in order to help you clarify your doubts. At the moment if the only symptoms have been fever, my recommendation is that you perform a blood test to determine its etiology in order to obtain an accurate diagnosis and appropriate treatment. I hope i have been helpful, if you have any other doubts, feel free to ask me, i ll be glad to help you. Dr. Valentina Romero.