Low fever with headache is usually caused by the following diseases. 1, the initial stage of the viral cold, patients often have dizziness, headache accompanied by low fever, body temperature continues at 37.0-37.9 ℃ and no high fever, at this time there is also a dry throat, sore throat, cough, coughing, coughing phlegm, runny nose and other symptoms. At this time, you need to drink a lot of fluids and warm water, at the same time, you need to pay attention to warmth, you can eat antiviral cold medicine, such as ribavirin and ganciclovir, you also need to drink a lot of water and pay attention to bed rest. 2, headache, low fever will also be common in the cerebrovascular insufficiency of blood supply, when the cerebral blood supply is not complete will cause cerebrovascular ischemia and lack of oxygen, often appear dizziness, headache, occasionally accompanied by low fever, but the body temperature has continued in 37.5 ℃ 3. Other infectious diseases such as rheumatic fever, tuberculosis fever or tumors may also cause headache and low fever. Whatever the case, it is recommended to go to the hospital for treatment of headache and low fever so as not to affect or delay the condition.