Hello, your fever is most probably of an infectious origin. Infections can be transmitted to other individuals. Fever, body pains and headache is experienced by patients in many infectious diseases. One possible clue for a diagnosis is if you had close contact with sick individuals (at work, at home etc). If the answer is yes then it s very likely that you ve got the same disease. You haven t given enough details for a more specific approach to your condition. For example did you have high fever ( 39 Celsius) ? High fever and severe headache can be symptoms of serious infections like meningitis or less serious ones like influenza (flu) and other common viral diseases. I suggest you consult your doctor as soon as possible.